Category Archives: Java Programs

Java Programs

Java Program to Find Square Root of a Number

In this tutorial, we will learn to create a Java program to Find square Root of a number 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
Class and Object.
Basic Java programming.
if-else statements.
Switch case.
Nested if-else Statements.
Java Scanner class.

What Is Square root?

Method of Finding “Square Root” is that numbers are multiplying by itself Twice “6 * 6= 36”. Where a square root of a number on getting multiplied by itself gives the original √36 = 6.
A square root of a number a is a number b such that b² =a.

Java Program to Find Square Root of a Number

In this our program we will create a program to find “Square Root” of a given number . We would first declared and initialized the required variables. Next, we would prompt user to input value.Later in the program we will find square root.

// java program to caluclate square root...

import java.util.Scanner;  
public class SquareRoot   
{  
public static void main(String[] args)    
{   
System.out.print("Enter a number: ");  
Scanner sc = new Scanner(System.in);  
// taking values form user..  
int number = sc.nextInt();  
System.out.println("The square root of "+ number+ " is: "+square_root(number));  
}  
//declaringa method for finding square root..  
public static double square_root(int number)   
{  
//declaring variables...
double temp;  
double sr=number/2;  
do   
{  
temp=sr;  
sr=(temp+(number/temp))/2;  
}   
while((temp-sr)!= 0);  
return sr;  
}  
}

// java program to caluclate square root...

import java.util.Scanner;

public class SquareRoot

{

public static void main(String[] args)

{

System.out.print("Enter a number: ");

Scanner sc = new Scanner(System.in);

// taking values form user..

int number = sc.nextInt();

System.out.println("The square root of "+ number+ " is: "+square_root(number));

}

//declaringa method for finding square root..

public static double square_root(int number)

{

//declaring variables...

double temp;

double sr=number/2;

{

temp=sr;

sr=(temp+(number/temp))/2;

}

while((temp-sr)!= 0);

return sr;

}

Output

Square Root

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

number = it will hold given number.
temp= it will hold temporary value of a number
sr= it will square root of a number.

We going to use the following formula to find the square root of a number.

in our program we have created a method square_root(number), in this method we have written a equation for finding the square root of a number.and for equation we have used do while loop.function returns the square root of a given number to main method

Where we will print the required square root of a given number as shown in image.

Java Program to Find HCF of two numbers

In this tutorial, we will learn to create a Java program that will find the HCF of two numbers using Java programming.

Prerequisites

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

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

Program Description:-

In Java programming, it is possible to take numerical input from the user and find HCF of two numbers with the help of a very small amount of code. The Java programming language has many types of predefined libraries which have support for the function in them with the help of these arithmetic expressions we can find the HCF. The program first takes the two numbers in input then it will find the HCF using the for loop and the conditional statements. At last, we will print the output HCF to the user.

With the help of this program, we can find HCF.

Here,

HCF:- Highest Common Factor.

Program to find HCF of two numbers:-

import java.util.Scanner;
public class HCF 
{
   public static void main(String args[]){
      //Declaring the required variables for the program.
      int a, b, i, hcf = 0;
      //Taking the input from the user.
      Scanner sc = new Scanner(System.in);
      //Taking the first number form the user.
      System.out.println("Enter first number :: ");
      a = sc.nextInt();
      //Taking the first number form the user.
      System.out.println("Enter second number :: ");
      b = sc.nextInt();
      //Calculating the HCF of two numbers.
      for(i = 1; i <= a || i <= b; i++) {
         if( a%i == 0 && b%i == 0 )
         hcf = i;
      }
      //Printing the output HCF of the numebrs.
      System.out.println("HCF of given two numbers is ::"+hcf);
   }
}

import java.util.Scanner;

public class HCF

{

public static void main(String args[]){

//Declaring the required variables for the program.

int a, b, i, hcf = 0;

//Taking the input from the user.

Scanner sc = new Scanner(System.in);

//Taking the first number form the user.

System.out.println("Enter first number :: ");

a = sc.nextInt();

//Taking the first number form the user.

System.out.println("Enter second number :: ");

b = sc.nextInt();

//Calculating the HCF of two numbers.

for(i = 1; i <= a || i <= b; i++) {

if( a%i == 0 && b%i == 0 )

hcf = i;

}

//Printing the output HCF of the numebrs.

System.out.println("HCF of given two numbers is ::"+hcf);

}

Output:-

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

a = it will hold the integer value1.
b = it will hold the integer value2.
t = it will hold the integer temporary value.
hcf = it will hold the integer value of calculated hcf.

Input number from the user.

Program Logic Code.

Printing output

Java Program to Find Students Grades using Switch Case

In this tutorial, we will learn to create a Java program to Find students Grade using Switch Case 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
Class and Object.
Basic Java programming.
if-else statements.
Switch case.
Nested if-else Statements.
Java Scanner class.

Grade of a Student.

Here we are going to write a Java program to find out students grades using switch case statement. The Table shows the grading system.

Score	Grade
Grade >=90	A
Grade=80-89	B
Grade=70-79	C
Grade=60-69	D
Grade=50-59	E
Grade <50	F

Java Program to Find Students Grades using Switch Case

In this our program we will create a program to find Student Grades using Switch Case. We would first declared and initialized the required variables. Next, we would prompt user to input value.Later in the program we will find Garde.

// Java program to find grade..
import java.util.Scanner;  
public class Student {

   public static void main(String[] args) {
      // score (0-100)
      String grade = null;
      System.out.print("Enter a number: ");  
      Scanner sc = new Scanner(System.in); 
      int score = sc.nextInt(); // Taking value from user at run time 

      switch(score/10) 
      {
        // for >= 90
        case 10:
        case 9:
           grade = "A";
           break;
        // for >= 80 and <90
        case 8:
           grade = "B";
           break;
        // for >= 70 and <80
        case 7:
           grade = "C";
           break;
        // for >= 60 and <70
        case 6:
           grade = "D";
           break;
        // for >= 50 and <60
        case 5:
           grade = "E";
           break;
        // for < 50
        default:
           grade = "F";
           break;
      }
      
      // displaying result...
      System.out.println("Your Grade is  = " + grade);
   }

}

// Java program to find grade..

import java.util.Scanner;

public class Student {

public static void main(String[] args) {

// score (0-100)

String grade = null;

System.out.print("Enter a number: ");

Scanner sc = new Scanner(System.in);

int score = sc.nextInt(); // Taking value from user at run time

switch(score/10)

{

// for >= 90

case 10:

case 9:

grade = "A";

break;

// for >= 80 and <90

case 8:

grade = "B";

break;

// for >= 70 and <80

case 7:

grade = "C";

break;

// for >= 60 and <70

case 6:

grade = "D";

break;

// for >= 50 and <60

case 5:

grade = "E";

break;

// for < 50

default:

grade = "F";

break;

}

// displaying result...

System.out.println("Your Grade is = " + grade);

}

Output

Your Grade

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

score =it will holds value of score given by user.
Grade= it will provide grade of given score.

In the next statement user will be prompted to enter the score then we will find the Grade according to score given bye user.

Now,we calculated the grade.Grades must be calculated based on following conditions.
Shown in above table using Switch Case as shown in image below.

In our program, we did not use the break statement. Whenever the condition is satisfied value is returned and the control came back to the main method. and according to return value we will print Grade to given score.

Java Program to Find exponents

In this tutorial, we will learn to create a Java Program to find Exponent 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.
In-built functions.

Exponent of a Number

Let’s take a value at base : 2
Now take a value at exponent : 3
So power(Exponent) of any number is baseⁿ given as base*base*base (3-times). Here base is called base and 3 is called the exponent.

are some example of exponents.

Java Program to Find exponents

In this program we will find exponent of any given number by user using loop. We would first declared and initialized the required variables. Next, we would prompt user to input the number and power of number .Then we will find the power of given number.

// java program to calculate power of a numebr
import java.util.Scanner;  
public class Test{
    
   public static void main(String[] args) 
      {
      //declaring and initiating variables 
      System.out.print("Enter base: ");  
      Scanner s = new Scanner(System.in);  
      int base = s.nextInt();   
      System.out.print("Enter Power: ");  
      Scanner sc = new Scanner(System.in);  
      int pow = sc.nextInt();   
      // Finding the exponent and printing result..
      System.out.println("Exponent is ="+Math.pow(base, pow));

   }
}

// java program to calculate power of a numebr

import java.util.Scanner;

public class Test{

public static void main(String[] args)

{

//declaring and initiating variables

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

Scanner s = new Scanner(System.in);

int base = s.nextInt();

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

Scanner sc = new Scanner(System.in);

int pow = sc.nextInt();

// Finding the exponent and printing result..

System.out.println("Exponent is ="+Math.pow(base, pow));

}

Output

Note : The above program works only if the Power is a positive integer (number).

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

base = it hold the value of base
pow = it will hold the power.

Let see the logic behind the the program

Take value of “base and exponents(Power)” from user, and put it in two variables base and pow respectively.

Here we will to use the “Math.pow(base, pow))” function which is define in Java standard library.it will take two parameter as a arguments base and power and returns the exponent of value supply to it.

At last print the resultant output as shown in image above.

Create Simple Mortgage Calculator In Java

In this tutorial, we will learn to create a Java Program to Create Simple Mortgage Calculator 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.

Mortgage Payment

Know as the amount of money that you need to return to the person,where you have your property mortgaged.

Formula to calculate Mortgage is:

“M = P [{r(1+r)^n}/{(1+r)^n – 1}]”

where
M = Monthly payment
P = principal
r = rate
n = number of payments

Create Simple Mortgage Calculator In Java

In this our program we will create a simple Mortgage Calculator. We would first declared and initialized the required variables. Next, we would prompt user to input value.Later in the program we will find Mortgage.

// program to Mortgage calculator...
import java.util.Scanner;  
class Mortage
{
	public static void main(String arg[])
 	{
	// Delclaring and taking value from user..
        Scanner scan = new Scanner(System.in); 
      	System.out.print("Enter Principal Amount : ");
      	double p = scan.nextDouble(); 
      	System.out.print("Enter Rate of Interest : ");
      	double r = scan.nextDouble(); 
      	r =( r/100)/12;  // calculating rate
      	System.out.print("Enter Time period in years : ");
      	int t= scan.nextInt();
      	t = t * 12;  // converting time in year and calculating Mortgage
      	double principal= (p * r) / (1 - Math.pow(1 + r, -t));
      // printing the result..
      	System.out.println("Payment is: " + principal);
 	}
}

// program to Mortgage calculator...

import java.util.Scanner;

class Mortage

{

public static void main(String arg[])

{

// Delclaring and taking value from user..

Scanner scan = new Scanner(System.in);

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

double p = scan.nextDouble();

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

double r = scan.nextDouble();

r =( r/100)/12; // calculating rate

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

int t= scan.nextInt();

t = t * 12; // converting time in year and calculating Mortgage

double principal= (p * r) / (1 - Math.pow(1 + r, -t));

// printing the result..

System.out.println("Payment is: " + principal);

}

Output

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 rate
t= it will hold time in a year.
principal= calculate payment of month.

In the next statement user will be prompted to enter the values of p,r and and later we will fine mortgage.

Here we will to use following formula “principal= (p * r) / (1 – Math.pow(1 + r, -t))” and Math.pow() function which is define in Java standard library.it will take two parameter as a arguments p,r and t values supply to it.

After calculating Mortgage value will be stored in variable principal.

Finally we will print the Mortgage of given values.

Java Program to Find Distance Between 2 Points

In this tutorial, we will learn to create a Java Program to Find Distance between 2 point 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.

Distance Between two Points

Using Pythagorean theorem to find the distance between two points (x₁, y₁) and (x₂, y₂), all we need are the coordinates in pairs and apply the formula.

Distance Formula:

Distance:- √((x₂ – x₁)² + (y₂ -y₁)²).

Assume :=> We have two points A and B, with coordinates (x₁, y₁) and (x₂, y₂) respectively. So their distance can be represented as AB and it can be calculated as.

The first point (A):- (x₁, y₁)
Second point (B):- (x₂, y₂)

Java Program to Find Distance Between 2 Points

In this our program we will create a program to find Distance Between two points. We would first declared and initialized the required variables. Next, we would prompt user to input value.Later in the program we will find Distance between points.

// java program to find distance between two places.
import java.util.Scanner;
public class Distance {
  public static void main(String[] args) {

    Scanner scan = new Scanner(System.in);

    // declaring variables
    int x1, x2, y1, y2, x, y;
    double distance;

    // Taking value  from user of cordinates..
    System.out.print("Enter first  coordinates: ");
    x1 = scan.nextInt();
    y1 = scan.nextInt();
    System.out.print("Enter second  coordinates: ");
    x2 = scan.nextInt();
    y2 = scan.nextInt();

    // calculate the distance between them
    x = x2-x1;
    y = y2-y1;
    distance = Math.sqrt(x*x + y*y);

    // display result
    System.out.println("Distance between two Point is = " + distance);
  }
}

// java program to find distance between two places.

import java.util.Scanner;

public class Distance {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

// declaring variables

int x1, x2, y1, y2, x, y;

double distance;

// Taking value from user of cordinates..

System.out.print("Enter first coordinates: ");

x1 = scan.nextInt();

y1 = scan.nextInt();

System.out.print("Enter second coordinates: ");

x2 = scan.nextInt();

y2 = scan.nextInt();

// calculate the distance between them

x = x2-x1;

y = y2-y1;

distance = Math.sqrt(x*x + y*y);

// display result

System.out.println("Distance between two Point is = " + distance);

}

Output

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

x1 = it will hold value of first coordinates
y1 = it will hold value of first coordinates
x2 = it will hold value of second coordinates
y2 = it will hold value of second coordinates
x= it will represent distance.
y= it will represent distance.
distance= it will display final result.

the Formula to find the distance between two points is:

To calculate the distance between two points “(x₁,y₁) and (x₂,y₂) or √ ( x )²+( y )²“ . All you need is use the coordinates formula shown below.

Here we will to use following formula “ Math.sqrt(x*x+y*y))” and Math.sqrt() function which is define in Java standard library.it will take two parameter as a arguments x and y values supply to it.And in return gives the required output.

As shown in image above.

Java Program to swap two Numbers

Java Program to Swap two Numbers

In this tutorial, we will learn to create a Java program that will Swap Two Numbers 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.
While loop in Java programming.

Program to Swap the Numbers:-

As we all know, Java is a very powerful language. With the help of the Java programming language, we can make many programs. We can perform many input-output operations using Java programming. In today’s tutorial, we take the input numbers from the user. Then we will swap the Numbers with the help of operators in the Java programming language.

With the help of this program, we can swap the Numbers.

Algorithm:-

1. Declare the variables for the program.

2. Taking the input numbers from the user.

3. Swapping that number using third variable.  

4. Print the Result.

5. End the program.

1. Declare the variables for the program.

2. Taking the input numbers from the user.

3. Swapping that number using third variable.

4. Print the Result.

5. End the program.

Program to Swap to Numbers using a third variable:-

import java.util.*;  
class Swap_With {  
    public static void main(String[] args) {  
       //Declaring the required variables for the program.
       int first, second, flag;// first and second are to input numbers
       //Taking the input numbers from the user.
       Scanner sc = new Scanner(System.in);  
       System.out.println("Enter the value of X and Y");  
      
       //Scanning the input numbers
       first = sc.nextInt();  
       second = sc.nextInt();  
       System.out.println("before swapping numbers: "+first +"  "+ second);  
       
       //Swapping the numbers one from two.
       flag = first;  
       first = second;  
       second = flag;  
       
       //printing the swapped numbers to the user.
       System.out.println("After swapping: "+first +"   " + second);  
       System.out.println( );  
    }    
}

import java.util.*;

class Swap_With {

public static void main(String[] args) {

//Declaring the required variables for the program.

int first, second, flag;// first and second are to input numbers

//Taking the input numbers from the user.

Scanner sc = new Scanner(System.in);

System.out.println("Enter the value of X and Y");

//Scanning the input numbers

first = sc.nextInt();

second = sc.nextInt();

System.out.println("before swapping numbers: "+first +" "+ second);

//Swapping the numbers one from two.

flag = first;

first = second;

second = flag;

//printing the swapped numbers to the user.

System.out.println("After swapping: "+first +" " + second);

System.out.println( );

}

Output:-

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

first= it will hold the integer value.
second = it will hold the integer value.
flag = it will hold the integer value.

Taking the input number 1 and 2 from the user.

Swapping the numbers.

Printing the output numbers.

Java Program to Calculate Average of 3 Numbers

In this tutorial, we will learn to create a Java program that will Calculate the Average of 3 Numbers 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 operator in Java programming.

What is the average of the 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 4 numbers as follows {2,4,6,8} then the average will be:-

average = 2+4+6+8/4

average = 5.

Algorithm:-

1. Declaring the variables for the program.

2. Taking the input three number from the user to find the average.

3. Calculating the average of the those numbers.

4. Printing the result average of that number to the user.

5. End the program.

1. Declaring the variables for the program.

2. Taking the input three number from the user to find the average.

3. Calculating the average of the those numbers.

4. Printing the result average of that number to the user.

5. End the program.

Program to Calculate the average of a Number

In this program, we will take three numbers in input from the user. Then we will add that number and store it in a variable as a sum. After that, we will divide the sum of those numbers by 3 to find the average. At last, we will print the average of 3 numbers.

With the help of this program, we can find the average of three numbers.

Program code:-

// Find sum and average of 3 numbers in Java

import java.util.*;

public class Average {
    public static void main(String args[]) {
        //Declaring the required variables for the program
        int no1, no2, no3, sum;
        float avg;
        //Taking the input numbers from the user.
        Scanner buf = new Scanner(System.in);
        //Taking the first number 
        System.out.print("Enter first number : ");
        no1 = buf.nextInt();
        //Taking the second number 
        System.out.print("Enter second number : ");
        no2 = buf.nextInt();
        //Taking the third number 
        System.out.print("Enter third number : ");
        no3 = buf.nextInt();
         
        /*Calculate sum and average of 3 numbers*/
        sum = no1 + no2 + no3;
        avg = (float)((no1 + no2 + no3) / 3);
        //Printing the average of 3 numbers.
        System.out.print("Sum : " + sum + "\nAverage : " + avg);
    }
}

				
					
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						// Find sum and average of 3 numbers in Java
 
import java.util.*;
 
public class Average {
    public static void main(String args[]) {
        //Declaring the required variables for the program
        int no1, no2, no3, sum;
        float avg;
        //Taking the input numbers from the user.
        Scanner buf = new Scanner(System.in);
        //Taking the first number 
        System.out.print("Enter first number : ");
        no1 = buf.nextInt();
        //Taking the second number 
        System.out.print("Enter second number : ");
        no2 = buf.nextInt();
        //Taking the third number 
        System.out.print("Enter third number : ");
        no3 = buf.nextInt();
         
        /*Calculate sum and average of 3 numbers*/
        sum = no1 + no2 + no3;
        avg = (float)((no1 + no2 + no3) / 3);
        //Printing the average of 3 numbers.
        System.out.print("Sum : " + sum + "\nAverage : " + avg);
    }
}

					

			

Output:-

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

no1 = it will hold the integer value.
no2 = it will hold the integer value.
no3 = it will hold the integer value.
sum = it will hold the integer value.
avg = it will hold the float value.

Taking input numbers from the user to for the average of two numbers.

Calculating the average of those numbers.

Printing output average for that given number.

Java Program to Calculate Average of Two Numbers

In this tutorial, we will learn to create a Java program that will Calculate the Average of Two Numbers 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 operator in Java programming.

What is the average of the 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 4 numbers as follows {2,4,6,8} then the average will be:-

average = 2+4+6+8/4

average = 5.

Algorithm:-

1. Declaring the variables for the program.

2. Taking the input number from the user to find the average.

3. Calculating the average of the those numbers.

4. Printing the result average of that number to the user.

5. End the program.

1. Declaring the variables for the program.

2. Taking the input number from the user to find the average.

3. Calculating the average of the those numbers.

4. Printing the result average of that number to the user.

5. End the program.

Program to Calculate the average of a Number

In this program, we will take two numbers in input from the user. Then we will add that number and store it in a variable. After that, we will divide the sum of those numbers by 2 to find the average. At last, we will print the average of two numbers.

With the help of this program, we can find the average of two numbers.

Program code:-

// Find sum and average of two numbers in Java

import java.util.*;

public class Average {
    public static void main(String args[]) {
        //Declaring the required variables for the program
        int no1, no2, sum;
        float avg;
        //Taking the input numbers from the user.
        Scanner buf = new Scanner(System.in);
        //Taking the first number 
        System.out.print("Enter first number : ");
        no1 = buf.nextInt();
        //Taking the second number 
        System.out.print("Enter second number : ");
        no2 = buf.nextInt();

        /*Calculate sum and average of two numbers*/
        sum = no1 + no2;
        avg = (float)((no1 + no2) / 2);
        //Printing the average of two numbers.
        System.out.print("Sum : " + sum + "\nAverage : " + avg);
    }
}

				
					
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						// Find sum and average of two numbers in Java
 
import java.util.*;
 
public class Average {
    public static void main(String args[]) {
        //Declaring the required variables for the program
        int no1, no2, sum;
        float avg;
        //Taking the input numbers from the user.
        Scanner buf = new Scanner(System.in);
        //Taking the first number 
        System.out.print("Enter first number : ");
        no1 = buf.nextInt();
        //Taking the second number 
        System.out.print("Enter second number : ");
        no2 = buf.nextInt();
 
        /*Calculate sum and average of two numbers*/
        sum = no1 + no2;
        avg = (float)((no1 + no2) / 2);
        //Printing the average of two numbers.
        System.out.print("Sum : " + sum + "\nAverage : " + avg);
    }
}

					

			

Output:-

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

no1 = it will hold the integer value.
no2 = it will hold the integer value.
sum = it will hold the integer value.
avg = it will hold the float value.

Taking input numbers from the user to for the average of two numbers.

Calculating the average of those numbers.

Printing output average for that given number.

Java Program to Get Current Date/Time

In this tutorial, we will learn to create a Java program that will Print Current Date/Time 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
Class and Object.
Basic Java programming.
Array.
User Define Functions.
in-built library functions.

Getting Current Date and Time in Java.

There are so many ways to get current date and time in java. Java provides so many classes that can be used to get current date and time in java.Let’s have a look at some of them.

java.time.Clock class.
java.time.LocalDate class.
java.time.format.DateTimeFormatter class.
java.util.Date class.
java.util.Calendar class.

Java Program to Get Current Date/Time

In this program we will create a program to find Current Date/Time. We would first declared and initialized the required variables.Later we add all the elements and find Current Date/Time.let’s have a look at the code

// Java Program to Display Current Date and Time
import java.util.*;

public class CDatetime {
	public static void main(String args[])
	{
		Date current_date = new Date();
		//"Date" is a  class
		//"current_date" is Date object

		System.out.println("Current Date and Time is: " + current_date);
		
		// printing Date  and time ...
	}
}

// Java Program to Display Current Date and Time

import java.util.*;

public class CDatetime {

public static void main(String args[])

{

Date current_date = new Date();

//"Date" is a class

//"current_date" is Date object

System.out.println("Current Date and Time is: " + current_date);

// printing Date and time ...

}

Output

In the above program, the current date and time is stored in variable current_date using Date() method.

Here how the above program code works:

Here we use class called Date class which represents the current date and time in Greenwich Mean Time. We can Display time in Indian Standard time also by adding 5 hours and 30 minutes .This class comes under the import java.util.* package of Java.

As you can see in our program we use in-built function to get Current Date and Time using Date() method which is define in import java.util.*; package.

First we declare a variable current_date and with the Date() Method we get the current Date/time of system. and simply

print Current date and time of system by default this function gives value in GMT(Greenwich Mean Time) we can show the value in Indian Standard Time by adding +5.30 in GMT to get Indian time.

Java Program to Print Invert Triangle

In this tutorial, we will learn to create a Java program that will Print Inverted Triangle using Java programming Language.

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
Class and Object.
Basic Java programming.
Loops in Java.
Nested for loop in Java.

Invert Triangle of Star

To print Inverted Triangle Star patterns in Java , we will use nested for loops. The outermost loop is responsible for the number of rows in star (*) of Inverted Triangle,whereas inner one loop will print the required number of stars * in each row.

Java Program to Print Invert Triangle

In this program we will print Inverted Triangle of Star using nested “For” loop and a while loop. We would first declared and initialized the required variables. Then we will create the “Inverted Triangle” of Star using below program.Let’s have a look.

// Java program to Print Reverse  full Pyramid 

// Importing input output classes
import java.io.*;

class revtriangle 
{

	public static void main(String[] args)
	{
		// Declaring and initializing variable to

		int num = 5;

		int i = num, j;

		// Nested while loops
		// Outer loop

		// Till condition satisfied
		while (i > 0) 
		{
			j = 0;

		
		// cheking Condition check
			while (j++ < num - i) 
			{
				// Print whitespaces
				System.out.print(" ");
			}

			j = 0;

			// Inner loop
			// Condition check
			while (j++ < (i * 2) - 1) {
				// Print star
				System.out.print("*");
			}

			// so next line
			System.out.println();

			// reversing the pyramid value
			i--;
		}
	}
}

// Java program to Print Reverse full Pyramid

// Importing input output classes

import java.io.*;

class revtriangle

{

public static void main(String[] args)

{

// Declaring and initializing variable to

int num = 5;

int i = num, j;

// Nested while loops

// Outer loop

// Till condition satisfied

while (i > 0)

{

j = 0;

// cheking Condition check

while (j++ < num - i)

{

// Print whitespaces

System.out.print(" ");

}

j = 0;

// Inner loop

// Condition check

while (j++ < (i * 2) - 1) {

// Print star

System.out.print("*");

}

// so next line

System.out.println();

// reversing the pyramid value

i--;

}

Output

Java Program to Print Invert Triangle

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

num = it will hold size or pyramid
i and j= it will use to iterate loops.

Now we going to run loops

Outermost loop to iterate through a number of rows as initialize . Now,

Run an inner loop from 1 to ‘i-1’

As you can see in the image above ,and again run another inner loop from 1 to rows * 2 – (i × 2 – 1) that will print over desire output.

We had printed reverse pyramid star(*) pattern using the following methods.

Java Program to Convert Fahrenheit to Celsius

In this tutorial, we will learn to create a Java program that will Convert Fahrenheit to Celsius using Java programming.

Prerequisites

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

Java Operators.
Basic Input and Output
Class and Object.
Basic Java programming.
Looping statements.

What Is Temperature ?

Temperature is a quantity that is use to measure the freezing and the boiling point of water. Which is measured by different scales in different regions like Celsius and Fahrenheit.
In Celsius scale, the boiling point of water is 100°C, and the freezing point is at 0°C, while in the Fahrenheit scale the boiling point of water is 212°F and freezing point is at 32°F.

Java Program to Convert Fahrenheit to Celsius

In this program we will convert temperature from Fahrenheit to Celsius. We would first declared and initialized the required variables. Next, we would prompt user to input the value in Fahrenheit. Later we will Convert the values into Celsius.

To convert values from Fahrenheit to Celsius we will use following Formula:

C = (F – 32)*(5/9)where, F is temperature in Fahrenheit and C is temperature in Celsius.

import java.util.Scanner;

public class Fahrenh_to_Celsisu {

    public static void main(String[] Strings) {
        double f,c;  // declaring variables..
        Scanner input = new Scanner(System.in);

        System.out.print("Input value in Fahrenheit: ");
        f = input.nextDouble();  // taking values from user...

         c =(( 5 *(f - 32.0)) / 9.0);  // Calculating Celsius
        // Printing the result..
        System.out.println(f + " Degree Fahrenheit is equal to = " + c + " in Celsius");

    }
}

import java.util.Scanner;

public class Fahrenh_to_Celsisu {

public static void main(String[] Strings) {

double f,c; // declaring variables..

Scanner input = new Scanner(System.in);

System.out.print("Input value in Fahrenheit: ");

f = input.nextDouble(); // taking values from user...

c =(( 5 *(f - 32.0)) / 9.0); // Calculating Celsius

// Printing the result..

System.out.println(f + " Degree Fahrenheit is equal to = " + c + " in Celsius");

}

Output

Java Program to Convert Fahrenheit to Celsius

Concept to find Fahrenheit to Centigrade.

First of all we will take the value in Fahrenheit temperature.
Then we will calculate c = 5 * (f – 32) / 9.
Print Celsius C.

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

f = it will hold Fahrenheit value.
c= it will hold Celsius value.

And in the next statement user will be prompted to enter value in Fahrenheit and which will be assigned to variable ‘f’.

After that with the formula we will convert the value of Fahrenheit to Celsius.

As you can see in above program, we first take value in Fahrenheit as input from user. Then convert the value of Fahrenheit in to Celsius using above conversion equation and print the Temperature in Celsius.

Prerequisites

What Is Square root?

Java Program to Find Square Root of a Number

Output

Java Program to Find HCF of two numbers

Prerequisites

Program Description:-

Program to find HCF of two numbers:-

Output:-

Prerequisites

Grade of a Student.

Score

Grade

Java Program to Find Students Grades using Switch Case

Output

Prerequisites

Exponent of a Number

Java Program to Find exponents

Output

Prerequisites

Mortgage Payment

Create Simple Mortgage Calculator In Java

Output

Prerequisites

Distance Between two Points

Java Program to Find Distance Between 2 Points

Output

Java Program to Swap two Numbers

Prerequisites

Program to Swap the Numbers:-

Algorithm:-

Program to Swap to Numbers using a third variable:-

Output:-

Java Program to Calculate Average of 3 Numbers

Prerequisites

What is the average of the numbers?

Algorithm:-

Program to Calculate the average of a Number

Program code:-

Output:-

Java Program to Calculate Average of Two Numbers

Prerequisites

What is the average of the numbers?

Algorithm:-

Program to Calculate the average of a Number

Program code:-

Output:-

Prerequisites

Getting Current Date and Time in Java.

Java Program to Get Current Date/Time

Output

Prerequisites

Invert Triangle of Star

Java Program to Print Invert Triangle

Output

Prerequisites

What Is Temperature ?

Java Program to Convert Fahrenheit to Celsius

Output

Concept to find Fahrenheit to Centigrade.