Category Archives: Java Basic Programs

Java Basic Programs

Duplicate Words in String Program in Java

In this tutorial, we will learn to create a Duplicate Words in String Program in Java using java programming.

Prerequisites

Before starting with this tutorial, we assume that you are best aware of the following Java programming concepts:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

Duplicate Words in a String

Here we need to find out the duplicate words present in a string and display those words.

Example string = ” Hi, welcome to W3adda hi”

Output: “Hi”

Duplicate Words in String Program in Java

// java program to find duplicate word in a string.. 
public class Duplicate_string {
    public static void main(String args[]) {
      // Containing duplicate words in a string..
      String str = "Duplicate => this is a example of duplicate string";
      // Converting given  Input String to lowerCase below:
      str= str.toLowerCase();
      // Split the given Input String into words using fucntion split() method
      String[] wd = str.split(" ");
      // counting lenth of given string..
      int length = wd.length;
     
      for( int i=0; i < length; i++)
      {
          // Set count to 1 for every iteration
          int count = 1;
          for(int j=i+1; j < length; j++)
          {
              if(wd[i].equals(wd[j]))
              {
                  count++;
// Set words[j]="0" to avoid  Visited words counting
                  wd[j] = "0";
              }
          }
          if (wd[i] != "0" && count > 1)
              System.out.print(" "+wd[i]+" ");
      }
    }
}

// java program to find duplicate word in a string..

public class Duplicate_string {

public static void main(String args[]) {

// Containing duplicate words in a string..

String str = "Duplicate => this is a example of duplicate string";

// Converting given Input String to lowerCase below:

str= str.toLowerCase();

// Split the given Input String into words using fucntion split() method

String[] wd = str.split(" ");

// counting lenth of given string..

int length = wd.length;

for( int i=0; i < length; i++)

{

// Set count to 1 for every iteration

int count = 1;

for(int j=i+1; j < length; j++)

{

if(wd[i].equals(wd[j]))

{

count++;

// Set words[j]="0" to avoid Visited words counting

wd[j] = "0";

}

if (wd[i] != "0" && count > 1)

System.out.print(" "+wd[i]+" ");

}

Output

Duplicate Word

In the above program, we have first declared and initialized a set of variables required in the program.

str= it will hold the string
length= it will hold the length of a string
i = for iteration
wd = it will hold the duplicate words

After declaring variables we initiate values in str .

after initiating string in the variable str first of all we convert into lower case.

then we split a string into words by using the split() method.

then we count the length of a string

and within the loop we find duplicate word present in a string as shown mage below

And finally, we will print the duplicate values within the string.

Increment Decrement Operators Program in Java

In this tutorial, we will learn to create a Increment Decrement Operators Program in Java using java programming.

Prerequisites

Before starting with this tutorial, we assume that you are best aware of the following Java programming concepts:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

Increment ++ and Decrement — Operator?

Operator “++” increases the value of a variable by 1 it means if value of a variable is “a=5” then “a++” gives as a=6;
Similarly, Decrement operator “–“ decreases the value of a variable by 1 it means if “a=5” then “a–“ gives as a=4;
Both operators are unary operators. These operators work on a single operand, that’s why they are called as unary operators.

Increment Decrement Operators Program in Java

In this program we will define Increment Decrement Operators .We would first declared and initialized the required variables. Next, we will define Increment Decrement Operators . Lets have a look at the code

Post Increment operator ++

// unianry operator ++ increment program
class Operator
{
    public static void main(String[] args) {
        int var = 5;
// till will show value of variable =5 after that it till increase the value of var.
     System.out.println("No change "+ var++ + " change afetr this line");
        // now the value of var is =6
     System.out.println("now it will print change value "+ var++);
        
    }
}

// unianry operator ++ increment program

class Operator

{

public static void main(String[] args) {

int var = 5;

// till will show value of variable =5 after that it till increase the value of var.

System.out.println("No change "+ var++ + " change afetr this line");

// now the value of var is =6

System.out.println("now it will print change value "+ var++);

}

Output

Post Decrement operator —

// unianry operator -- decrement program
class Operator
{
    public static void main(String[] args) {
        int var = 5;
// till will show value of variable =5 after that it till decrease the value of var.
     System.out.println("No change "+ var-- + " change afetr this line");
        // now the value of var is =4
     System.out.println("now it will print change value "+var--);
        
    }
}

// unianry operator -- decrement program

class Operator

{

public static void main(String[] args) {

int var = 5;

// till will show value of variable =5 after that it till decrease the value of var.

System.out.println("No change "+ var-- + " change afetr this line");

// now the value of var is =4

System.out.println("now it will print change value "+var--);

}

Output

Pre Increment operator ++

If we use “++” operator as prefix => ++var, then value of var is incremented by 1 then it returns value.

// unianry operator ++ pre increment program
class Operator
{
    public static void main(String[] args) {
        int var = 5;
// till will increase value of variable ot  6 after that  it will print value of var.
     System.out.println("Print change value "+ ++var +" ");
        // now the value of var is =7 
     System.out.println(" now it will print change value "+ ++var);
        
    }
}

// unianry operator ++ pre increment program

class Operator

{

public static void main(String[] args) {

int var = 5;

// till will increase value of variable ot 6 after that it will print value of var.

System.out.println("Print change value "+ ++var +" ");

// now the value of var is =7

System.out.println(" now it will print change value "+ ++var);

}

Output

Pre Decrement operator —

If we use “–“ operator as prefix => —var, then value of var is decremented by 1 then it returns value.

// unianry operator -- pre decrement program
class Operator
{
    public static void main(String[] args) {
        int var = 5;
// till will decraese value of variable ot 4 after that  it will print value of var.
     System.out.println("No change "+ --var + " change afetr this line ");
        // now the value of var is =3
     System.out.println("now it will print change value "+ --var);
        
    }
}

// unianry operator -- pre decrement program

class Operator

{

public static void main(String[] args) {

int var = 5;

// till will decraese value of variable ot 4 after that it will print value of var.

System.out.println("No change "+ --var + " change afetr this line ");

// now the value of var is =3

System.out.println("now it will print change value "+ --var);

}

Output

Java Program to calculate Marks Average

In this tutorial, we will learn to create a Java program that will calculate Marks Average using Java programming.

Prerequisites

Before starting with this tutorial, we assume that you are the best aware of the following Java programming topics:

Operators in Java Programming.
Basic Input and Output function in Java Programming.
Basic Java programming.
Arithmetic operations in Java Programming.

What is a percentage of numbers?

The percentage of all the marks is calculated by adding the total marks. And then we will divide it by the maximum marks and multiplied by 100.

What is the average of numbers?

The average of numbers in mathematics means that all the numbers are added and then the sum of all the numbers is divided by the total number of objects.

It means if there are 5 subject marks as follows {60,60,60,80,70} then the average will be:-

average = 60+60+60+80+70/5

average = 60.

Algorithm:-

1. Declaring the variables for the program.

2. Taking the input marks from the user.

3. Adding those marks finding the total.

4. Finding the average from the total marks.

5. Finding the percentage of those marks.

5. Printing the result numbers.

7. End Program.

1. Declaring the variables for the program.

2. Taking the input marks from the user.

3. Adding those marks finding the total.

4. Finding the average from the total marks.

5. Finding the percentage of those marks.

5. Printing the result numbers.

7. End Program.

Program to calculate Average of marks.

In this program, we will first take the marks of all five subjects from the user. And then we will add them to find the total marks. Now the total will be divided by the number of subjects to find the average. Then the total will divide by maximum marks by 5. Last, we will print the output average marks.

Example using the below program.

Program Code:-

import java.util.*;//Importing the package.
class AvgMarks
{
    //Body of the main function 
   public static void main(String args[])
  {
    //Declaring the required variable for the program.
    int i;
    //Taking the input number of subjects from the user.
    System.out.println("Enter number of subjects");
    //Scanning the input from the user
    Scanner sc=new Scanner(System.in);
    
    int n=sc.nextInt();
 
    int[] a=new int[n];
 
    double avg=0;
    //Taking the marks from the user for the subjects
    System.out.println("Enter marks");
 
    for( i=0;i<n;i++)
    {
       a[i]=sc.nextInt();
    }
 
    for( i=0;i<n;i++)
    {
      avg=avg+a[i];
    }
    //calculating the average of the marks
    System.out.print("Average of (");
 
    for(i=0;i<n-1;i++)
    {
      System.out.print(a[i]+",");
    }
    //Printing the average of the marks//
    System.out.println(a[i]+") ="+avg/n);
  }
}

import java.util.*;//Importing the package.

class AvgMarks

{

//Body of the main function

public static void main(String args[])

{

//Declaring the required variable for the program.

int i;

//Taking the input number of subjects from the user.

System.out.println("Enter number of subjects");

//Scanning the input from the user

Scanner sc=new Scanner(System.in);

int n=sc.nextInt();

int[] a=new int[n];

double avg=0;

//Taking the marks from the user for the subjects

System.out.println("Enter marks");

for( i=0;i<n;i++)

{

a[i]=sc.nextInt();

}

for( i=0;i<n;i++)

{

avg=avg+a[i];

}

//calculating the average of the marks

System.out.print("Average of (");

for(i=0;i<n-1;i++)

{

System.out.print(a[i]+",");

}

//Printing the average of the marks//

System.out.println(a[i]+") ="+avg/n);

}

Output:-

In the above program, we have first initialized the required variable.

i = it will hold the integer value.
average = it will hold the float value.
a = it will hold the integer value.

Input number of subjects and the marks from the user.

Program Logic Code.

Printing output.

Variables Initialization Program in Java

In this tutorial, we will learn to create a Java to Program Variables Initialization Program in Java using java programming.

Prerequisites

Before starting this tutorial, we assume that you are the best aware of the following Java programming concepts.

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.

Variables Initialization in Java

Just like other programming languages, we can declare and initiate variables in Java, here is the syntax and example of how we can declare a variable and initiate values of a variable.

“Data_Type => variable_name”
variable_name=value;
int a= 10;

Variables Initialization Program in Java

In this program, we will find the smallest element in an array using a nested for loop. We would first declare and initialized the required variables. Next, we will find the smallest number in an array. Let’s have a look at the code.

// java program how to define variable and initiate variable
public class Variables{

     public static void main(String []args)
     {
     //Declaring variables and initiating values..
		int 	var	=5;
		char 	var1	='A';
		float 	var2	=6.0f;
		String 	var3	="Hello";
	//Printing the values of variables 
		System.out.println (" var=  "+ var);
		System.out.println (" var1= "+var1);
		System.out.println (" var2= "+var2);
		System.out.println (" var3= "+var3);
     }
}

// java program how to define variable and initiate variable

public class Variables{

public static void main(String []args)

{

//Declaring variables and initiating values..

int var =5;

char var1 ='A';

float var2 =6.0f;

String var3 ="Hello";

//Printing the values of variables

System.out.println (" var= "+ var);

System.out.println (" var1= "+var1);

System.out.println (" var2= "+var2);

System.out.println (" var3= "+var3);

}

Output

Printing the values of variables

In the above program, we have first declared and initialized a set of variables required in the program.

var = it will hold integer value.
var1 = it will hold character value.
var2 = it will hold float value.
var3 = it will hold string value.

After declaring variables we initiate values in variables.

Now we will print the values of the variables.

What is the difference between Declaration vs. Initialization?

Declaration:=>

The process of Declaration is by defining the variable along with its type and name.
Example:=> we are declaring a variable named var variable.
int var;

Initialization:=>

here we assign a value to a variable as shown below
Example: Var = 10;

Java Program to Get IP Address

In this tutorial, we will learn to create a Java program that will get the IP address of the computer using Java programming.

Prerequisites

Before starting with this tutorial, we assume that you are the best aware of the following Java programming topics:

Operators in Java Programming.
Basic Input and Output function in Java Programming.
Basic Java programming.
Header Libraries and their usage.

Get IP address

In Java programming, it is possible to take or fetch the ip address from the computer and convert it into words or can display in words with the help of a very small amount of code. The Java language has many types of header libraries which has supported function in them, with the help of these files the programming is easy.

Algorithm:-

1. Create a socket to define network interface IPv4.

2. Define the IPv4 address type.

3. Define the port name where network is attached.

4. Access the network interface information by passing address using ioctl.

5. Extract the IP address.

1. Create a socket to define network interface IPv4.

2. Define the IPv4 address type.

3. Define the port name where network is attached.

4. Access the network interface information by passing address using ioctl.

5. Extract the IP address.

Program:-

import java.net.InetAddress; //Importing java packages.
public class GetIpAddress //Main Class function
{
   //Body of the main function
   public static void main(String args[]) throws Exception{
      //Fetching the ip address of the machine
      InetAddress addr = InetAddress.getLocalHost();
      //Printing the host machine ip address to the user
      System.out.println("Local HostAddress: "+addr.getHostAddress());
      String hostname = addr.getHostName();
      //Printing the host machine name to the user
      System.out.println("Local host name: "+hostname);
   }
}

import java.net.InetAddress; //Importing java packages.

public class GetIpAddress //Main Class function

{

//Body of the main function

public static void main(String args[]) throws Exception{

//Fetching the ip address of the machine

InetAddress addr = InetAddress.getLocalHost();

//Printing the host machine ip address to the user

System.out.println("Local HostAddress: "+addr.getHostAddress());

String hostname = addr.getHostName();

//Printing the host machine name to the user

System.out.println("Local host name: "+hostname);

}

Output:-

In the above program, we have first initialized the required variable.

addr = it will hold the ip address of the machine on the network.
hostname = it will hold the host name of the machine on the network.

Including the packages files required for the program.

First we will retrieving the ip address of the machine on the network.

Body of the Main function of the program.

Printing the ip address of the machine.

Printing the host name of the machine.

Java Program to Reverse a String using Recursion

In this tutorial, we will learn to create a Java program that will reverse a string Using Recursion in Java programming.

Prerequisites

Before starting with this tutorial, we assume that you are the best aware of the following Java programming topics:

Operators in Java Programming.
Usage of Conditional statements in Java Programming.
Basic Input and Output function in Java Programming.
Basic Java programming.

What is Recursion? Reverse a Sentence Using it?

The recursion means a function or program that repeats itself until the condition is satisfied. The recursion repeats the program execution in a controlled format. Today we will reverse a sentence using the recursion.

Algorithm:-

1. Declaring the variables for the program.

2. Taking the input string from the user.

3. Send that string to the function.

4. Passing those variable to if conditional.

5. Printing the result words.

1. Declaring the variables for the program.

2. Taking the input string from the user.

3. Send that string to the function.

4. Passing those variable to if conditional.

5. Printing the result words.

Reverse a string Using Recursion

In this program of recursion, we will take the input string from the user and store it in the string variable. Then will use that string variable in a user-defined function. At last, we will reverse that string using a recursion program.

With the help of the below, code, we will reverse a string Using Recursion.

Program Code:-

//Java Program to reverse a string using recursion.
public class RevStr//Reversing the string using the function
{  
//recursive function to reverse a string      
public String reverseString(String str)  
{  
//checks if the string is empty   
if(str.isEmpty())  
{  
//printing the output string to the user.
System.out.println("First the String is empty.") ; 
//if the above condition is true returns the same string      
return str;  
}   
else   
{  
//printing the output string to the user.
return reverseString(str.substring(1))+str.charAt(0);  
}  
}  
public static void main(String[] args)   
{  
RevStr rs = new RevStr();  
//Declaring the variables for the program. 
String resultantSting1 = rs.reverseString("W3Adda");  
String resultantSting2 = rs.reverseString("Tutorials");  
String resultantSting3 = rs.reverseString("Rocks");  
//Calling the reverse string function.
System.out.println(resultantSting1);  
//Calling the reverse string function.
System.out.println(resultantSting2);  
//Calling the reverse string function.
System.out.println(resultantSting3);   
}  
}

//Java Program to reverse a string using recursion.

public class RevStr//Reversing the string using the function

{

//recursive function to reverse a string

public String reverseString(String str)

{

//checks if the string is empty

if(str.isEmpty())

{

//printing the output string to the user.

System.out.println("First the String is empty.") ;

//if the above condition is true returns the same string

return str;

}

else

{

//printing the output string to the user.

return reverseString(str.substring(1))+str.charAt(0);

}

public static void main(String[] args)

{

RevStr rs = new RevStr();

//Declaring the variables for the program.

String resultantSting1 = rs.reverseString("W3Adda");

String resultantSting2 = rs.reverseString("Tutorials");

String resultantSting3 = rs.reverseString("Rocks");

//Calling the reverse string function.

System.out.println(resultantSting1);

//Calling the reverse string function.

System.out.println(resultantSting2);

//Calling the reverse string function.

System.out.println(resultantSting3);

}

Output:-

In the above program, we have first initialized the required variable.

ResultantString1 = it will hold the string value for the program.
ResultantString2 = it will hold the string value for the program.
ResultantString3 = it will hold the string value for the program.

Calling the reverse string function.

Body of the Reverse string function.

Printing the output of the program reversed string.

Java Program to check Palindrome string using Recursion

In this tutorial, we will learn to create a Java program that will check Palindrome string using Recursion using Java programming.

Prerequisites

Before starting with this tutorial, we assume that you are the best aware of the following Java programming topics:

Operators in Java Programming.
Basic Input and Output function in Java Programming.
Basic Java programming.
For loop in Java programming.
Conditional Statements in Java programming.
Arithmetic operations in Java Programming.

What is a palindrome string/number?

The Palindrome string/number means a string/number that is the same when we read it from forward and reverse.

For Example 1:- AddA is a palindrome string that is the same when we write it in reverse order, 1221

Example 2:- 1221 this is a palindrome number that is the same when we write it in reverse order, 1221.

Example 3:- 123 this is not a palindrome number, it is not the same when we write it in reverse order, 321.

Algorithm:-

1. Declaring the variables for the program.

2. Taking the input string from the user.

3. Calculating the string is a Palindrome string or not.

4. Printing the result.

5. End the program.

1. Declaring the variables for the program.

2. Taking the input string from the user.

3. Calculating the string is a Palindrome string or not.

4. Printing the result.

5. End the program.

Program to Check Whether a String is Palindrome or Not:-

To check whether a number is a Palindrome string or not. In today’s Java program, we will write code for checking. First, we will take a string of input from the user. Then we will pass it into the program to Check Whether a String is Palindrome or Not.

With the help of the below program, we can Check the Palindrome string or Not.

Program Code:-

import java.util.Scanner;
public class RecPalJava 
{
   // to check if string is palindrome using recursion
   public static boolean checkPalindrome(String str)
   {
       //checking the Palindrome string  
      if(str.length() == 0 || str.length() == 1)
         return true; 
      if(str.charAt(0) == str.charAt(str.length() - 1))
         return checkPalindrome(str.substring(1, str.length() - 1));
      return false;
   }
   //Body of the main function
   public static void main(String[]args)
   {
      
      Scanner sc = new Scanner(System.in);
      //Taking input from the user for the program.
      System.out.println("Please enter a string : ");
      //Declaring the required variable for the program.
      String strg = sc.nextLine();
      //Printing the output of the program palindriome or not.
      if(checkPalindrome(strg))
      {
         System.out.println(strg + " is palindrome");
      }
      else
      {
         System.out.println(strg + " not a palindrome");
      }
      sc.close();
   }
}

import java.util.Scanner;

public class RecPalJava

{

// to check if string is palindrome using recursion

public static boolean checkPalindrome(String str)

{

//checking the Palindrome string

if(str.length() == 0 || str.length() == 1)

return true;

if(str.charAt(0) == str.charAt(str.length() - 1))

return checkPalindrome(str.substring(1, str.length() - 1));

return false;

}

//Body of the main function

public static void main(String[]args)

{

Scanner sc = new Scanner(System.in);

//Taking input from the user for the program.

System.out.println("Please enter a string : ");

//Declaring the required variable for the program.

String strg = sc.nextLine();

//Printing the output of the program palindriome or not.

if(checkPalindrome(strg))

{

System.out.println(strg + " is palindrome");

}

else

{

System.out.println(strg + " not a palindrome");

}

sc.close();

}

Output:-

In the above program, we have first initialized the required variable.

strg = it will hold the string value of the input for the program.

Input message for the user for the string value.

Program Logic Code to check the string is palindrome or not.

Printing output Palindrome number or not.

Java Program to perform Arithmetic Operation using Method Overloading

In this tutorial, we will learn to create a Java program that will perform Arithmetic operations using Method Overloading in Java programming.

Prerequisites

Before starting with this tutorial, we assume that you are the best aware of the following Java programming topics:

Operators in Java Programming.
Basic Input and Output function in Java Programming.
Basic Java Programming.
Arithmetic operations in java programming.

Program to Description-:-

In today’s tutorial, we will create a program that will perform Arithmetic operations on the two numbers using the concepts method overloading. First, we will take input numbers from the user. We will use the arithmetic operators, in java, for calculations. Then we will print the output of different overloaded functions to the user. First, an addition function goes under the execution, then the overloaded method goes under execution.

With the help of this program, we can take input and perform the arithmetic operations.

Algorithm:-

1. Declaring the variables for the program.

2. Taking the input numbers from the user in number format.

3. Then we will perform the arithmetic operations on that numbers.

4. Printing the output to the user.

4. End program.

1. Declaring the variables for the program.

2. Taking the input numbers from the user in number format.

3. Then we will perform the arithmetic operations on that numbers.

4. Printing the output to the user.

4. End program.

Program to Code:-

import java.util.*;
class OverMeth{

//addition method of parameter a and b

void addition(int a,int b){

int sum=a+b;

System.out.println("Sum of two numbers is "+sum);

}

//addition method of parameter a, b and c

void addition(int a,int b,int c){

int sum=a+b+c;

System.out.println("Sum of three numbers is "+sum);

}

public static void main(String args[]){

OverloadingTest1 ovl=new OverloadingTest1();

ovl.addition(2,5,10);

ovl.addition(15,10);

}

}

import java.util.*;

class OverMeth{

//addition method of parameter a and b

void addition(int a,int b){

int sum=a+b;

System.out.println("Sum of two numbers is "+sum);

}

//addition method of parameter a, b and c

void addition(int a,int b,int c){

int sum=a+b+c;

System.out.println("Sum of three numbers is "+sum);

}

public static void main(String args[]){

OverloadingTest1 ovl=new OverloadingTest1();

ovl.addition(2,5,10);

ovl.addition(15,10);

}

Output:-

In the above program, we have first initialized the required variable.

a= it will hold the number value for the program.
b = it will hold the number value for the program.
sum = it will hold the sum value of the numbers.

Adding with the first method of overloading.

Adding with the second method of overloading for three numbers.

Calling the functions and printing the output to the user.

Java Program to make a calculator using switch case

In this tutorial, we will learn to create a Java Program to make calculator using switch case in Java using Java programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following Java programming topics

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.
Scanner class.
Basic inbuilt unctions.

What is calculator?

Calculator is a portable electronic machine used to perform calculations,basic arithmetic mathematics.

Like : arithmetic continuations “( +,-,*/,%)”.

Java Program to make a calculator using switch case

In our program we will make a calculator using switch case in java programming. We would first declared and initialized the required variables. Next, we would prompt user to input the two values and a symbol for calculating values .Lets have a look at the code.

// Java program fro calculator using swicth case stamenents..
import java.util.Scanner;
public class Calculator
{
    public static void main(String[] args) {

    	double a,b,result; // Declaring a variables 
        Scanner s = new Scanner(System.in);
        System.out.print("Enter first number value:");
        a = s.nextDouble(); // getting values from user...
        System.out.print("Enter second number value:");
        b = s.nextDouble();

        System.out.print("Enter any operator (+, -, *, /): ");
        char op = s.next().charAt(0); // taking operator

        switch(op) // using switch case to create Caluclator
        {
            case '+':
            	result = a + b;
                break;    // condition for addition

            case '-':
            	result =a - b; 
                break; // condition for subtraction

            case '*':
            	result = a * b;
                break; // condition for Multiplicatin

            case '/':
            	result = a / b;
                break; // condition for Divison

                default: 
                System.out.printf("You have entered wrong operator or value");
                return;
        }

        System.out.println(a+" "+op+" "+b+": "+result);
    }
}

// Java program fro calculator using swicth case stamenents..

import java.util.Scanner;

public class Calculator

{

public static void main(String[] args) {

double a,b,result; // Declaring a variables

Scanner s = new Scanner(System.in);

System.out.print("Enter first number value:");

a = s.nextDouble(); // getting values from user...

System.out.print("Enter second number value:");

b = s.nextDouble();

System.out.print("Enter any operator (+, -, *, /): ");

char op = s.next().charAt(0); // taking operator

switch(op) // using switch case to create Caluclator

{

case '+':

result = a + b;

break; // condition for addition

case '-':

result =a - b;

break; // condition for subtraction

case '*':

result = a * b;

break; // condition for Multiplicatin

case '/':

result = a / b;

break; // condition for Divison

default:

System.out.printf("You have entered wrong operator or value");

return;

}

System.out.println(a+" "+op+" "+b+": "+result);

}

Output

Switch case Calculator.

In the above program, we have first declared and initialized a set variables required in the program.

a= it will hold First value.
b= it will hold second value.
op=it will hold operator value.

And in the next statement user will be prompted to enter two values and which will be assigned to variable ‘a‘ and ‘b‘ respectively.

And after taking the values of a and b we will ask user to input symbol to perform calculation

After taking all the values and sign in op we will pass the value of op to switch case condition Calculate values of a operation pass to switch case.

The above switch case compute the Multiplication of two numbers and print the output.

And with the break statement compiler ends the switch statement and operation given different different operators can be performed.

Java Program to find quotient and remainder

In this tutorial, we will learn to create a Java Program to find Quotient and Remainder in Java using Java programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following Java programming topics:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

Quotient and Remainder

For find the Quotient:
we will use “/” operator.
For that we must divided by divisor “dividend/divisor”.
Example:=> 12/4 =3 gives 3
For find the Remainder:
Same as to find the remainder we use “%”operator.
the dividend is divided by the divisor and the remainder returned by the “%” modules operator.
Example:=> 12%4 =0 gives 0.

Java Program to find quotient and remainder

In this program we will learn to create a Program to find Quotient and Remainder .We would first declared and initialized the required variables. Next, we would prompt user to input dividend and Divisor . Later in program we will find quotient and remainder.

// java program to calculate quotient and Remainder. 

import java.util.Scanner;
 public class QuotientRemainder 
 {
  public static void main(String[] args) 
  {
    // Declaring variables and takin value from user..
    int number,divsr,quotient,remainder;
    Scanner s = new Scanner(System.in);   
    System.out.println("please enter dividend / number");
    dividend = s.nextInt(); 
    Scanner sc = new Scanner(System.in);   
    System.out.println("please enter divisor ");
    divsr = sc.nextInt(); 
   // Finding Quotient..
    quotient = number / divsr;
   // Finding Remainder..
    remainder = number % divsr;

    // Printing the result for Quotient..
    System.out.println("Quotient = " + quotient);
    // Printing the result for Remainder..
    System.out.println("Remainder = " + remainder);
 
 }
}

// java program to calculate quotient and Remainder.

import java.util.Scanner;

public class QuotientRemainder

{

public static void main(String[] args)

{

// Declaring variables and takin value from user..

int number,divsr,quotient,remainder;

Scanner s = new Scanner(System.in);

System.out.println("please enter dividend / number");

dividend = s.nextInt();

Scanner sc = new Scanner(System.in);

System.out.println("please enter divisor ");

divsr = sc.nextInt();

// Finding Quotient..

quotient = number / divsr;

// Finding Remainder..

remainder = number % divsr;

// Printing the result for Quotient..

System.out.println("Quotient = " + quotient);

// Printing the result for Remainder..

System.out.println("Remainder = " + remainder);

}

Output

In the above program, we have first declared and initialized a set variables required in the program.

number= it will hold Dividend
divsr= it will hold divisor.
quotient= it will hold Quotient value.
remainder= it will hold Remainder.

After declaring variables we going to take value of Dividend and Divisor form user as shown in picture below.

After taking all the values,Now we will calculate Both Quotient and Remainder
First of all we calculate the Quotient for finding quotient we simply divide dividend by divisor using “/” operator.

then we calculate the Remainder for finding remainder we simply divide dividend by divisor using “%” operator.

At last will print the return value by performing the operations as shown below.

Java Program to calculate simple interest

In this tutorial, we will learn to create a Java Program to calculate simple interest using java programming.

Prerequisites

Before starting with this tutorial, we assume that you are best aware of the following Java programming concepts:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

What is Simple Interest?

Simple Interest is a method used in Banking , Business and in economic sectors to calculate the interest charges on loans. Formula to calculate Simple interest

Formula:=>

Simple Interest = (P × R × T)/100
Where P = Principal Amount, R = Rate per Annum, T = Time (years)

where:

P is Principal amount.
R is rate per annum.
T is time in years.

Algorithm

Define variables as Principal(P), Interest(i) and Time of loans in year(t).
Use in the formula.
Print the Simple Interest.

Java Program to calculate simple interest

In this program we will find simple interest of given principal rate and time using java programming. We would first declared and initialized the required variables. Next, we will find simple interest. Lets have a look at the code.

import java.util.Scanner;
import java.util.*;
public class Simple_interest 
{
    public static void main(String args[]) 
    {
        //decalring varaibles and taking value from user..
        float p, r, t, si;
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter  Principal : ");
        p = scan.nextFloat();
        System.out.print("Enter Rate of interest : ");
        r = scan.nextFloat();
        System.out.print("Enter Time period in year : ");
        t = scan.nextFloat();
        scan.close();
        // calculating simple interest 
        si = (p * r * t) / 100;
        //Printing the result of calculation..
        System.out.print("Simple Interest is: " +si);
    }
}

import java.util.Scanner;

import java.util.*;

public class Simple_interest

{

public static void main(String args[])

{

//decalring varaibles and taking value from user..

float p, r, t, si;

Scanner scan = new Scanner(System.in);

System.out.print("Enter Principal : ");

p = scan.nextFloat();

System.out.print("Enter Rate of interest : ");

r = scan.nextFloat();

System.out.print("Enter Time period in year : ");

t = scan.nextFloat();

scan.close();

// calculating simple interest

si = (p * r * t) / 100;

//Printing the result of calculation..

System.out.print("Simple Interest is: " +si);

}

Output

Simple Interest.

In the above program, we have first declared and initialized a set variables required in the program.

p= it will hold value of principal.
r= it will hold value of interest.
t =it will hold value of time in year.
si= it will hold value of simple interest.

After declaring variables we initiate values in variables.

now take all the values of Principal rate and time.

after getting all the values we will calculate simple interest using the below formula.

Now print the simple intereset

Java Program to check whether input character is vowel or consonant

In this tutorial, we will learn to create a Java Program to check Input Numbers is vowel or consonant in Java using Java programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following Java programming topics:

Java Operators.
Basic Input and Output function in Java.
Class and Object in Java.
Basic Java programming.
If-else statements in Java.
For loop in Java.

Vowel

A vowel is a letter that speak with an open sound without closing any part of the mouth is called as vowel.
Example : a,e,i,o,u.

Consonant

A consonant is a speech sound that is not a vowel.
Example:- As we know a,e,i,o,,u are called vowels. And renaming are called consonants.

Java Program to check whether input character is vowel or consonant

In this program we will learn to create a Program that checks weather input character is Vowels and Consonants .We would first declared and initialized the required variables. Next, we would prompt user to input a character. Later in program we will find inputted character is Vowels or Consonants .

// Java program t fin given character is vowel or Consonant
import java.util.Scanner;
class Cont_vow_cons {
 
  public static void main(String[] args) 
  {
    // Declaring and taking value form user...
    Scanner sc = new Scanner(System.in);   
    System.out.println("please enter any charcater");
    char ch = sc.next().charAt(0); 
    
      // checking character is any of a, e, i, o, u ..
    if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') 
    {
    System.out.println("Vowels: " + ch);
     }
     // check if character is not in between a to z
      else if ((ch >= 'a' && ch <= 'z')) 
      {
      System.out.println("Consonants: " + ch);  
      }     
}
}

// Java program t fin given character is vowel or Consonant

import java.util.Scanner;

class Cont_vow_cons {

public static void main(String[] args)

{

// Declaring and taking value form user...

Scanner sc = new Scanner(System.in);

System.out.println("please enter any charcater");

char ch = sc.next().charAt(0);

// checking character is any of a, e, i, o, u ..

if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u')

{

System.out.println("Vowels: " + ch);

}

// check if character is not in between a to z

else if ((ch >= 'a' && ch <= 'z'))

{

System.out.println("Consonants: " + ch);

}

Output

Vowel

Consonant

In the above program, we have first declared and initialized a set variables required in the program.

ch= it will hold given character.

And in the next statement we will ask user to input Character as shown in picture below.

After taking value from user with the help of “if-else” statement we will check the inputted character is a vowel or consonant, using following logic.

Logic For Vowel.

For Consonant.

Note : Inputted value by user must be a Character.