Category Archives: Java Programs

Java Programs

Java program to break integer into digits

In this tutorial, we will learn to create a Java program to break integer into digits 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.
User Define functions.

Steps to break number into digit.

In our Java program to break integer into digits using a while loop.
first of all while loop will count the total digits in a number.
And the second while loop will iterate the Integer
and print each digit as an output.

Java program to break integer into digits.

In this program we would find digit value from a given integer whole number.first of all we take a value from user and then break whole number into digit.

// Java program to find digit of given  number
import java.util.Scanner;
public class Digitsin_no {
	private static Scanner sc;
	public static void main(String[] args) {
// Decalring variables and taking values fro user
		int number, rem, temp, count = 0;
		sc = new Scanner(System.in);		
		System.out.print("Enter Any Number = ");
		number = sc.nextInt();
		temp = number;
         // copy to temp original numebr
		while(temp > 0)
		{
			temp = temp / 10;
			count++;
		}
		while(number > 0)
		{
			rem = number % 10;
			System.out.println(" Digit at Position " + count +  " = " + rem);
			number = number / 10;
			count--;
		}
	}
}

// Java program to find digit of given number

import java.util.Scanner;

public class Digitsin_no {

private static Scanner sc;

public static void main(String[] args) {

// Decalring variables and taking values fro user

int number, rem, temp, count = 0;

sc = new Scanner(System.in);

System.out.print("Enter Any Number = ");

number = sc.nextInt();

temp = number;

// copy to temp original numebr

while(temp > 0)

{

temp = temp / 10;

count++;

}

while(number > 0)

{

rem = number % 10;

System.out.println(" Digit at Position " + count + " = " + rem);

number = number / 10;

count--;

}

Output

Number into Digit.

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

number= it will hold entered number.
rem= it will hold the result.
temp= it will hold temporary number.
count= it will count digit value.

After that we take a number from user and find given number is a Magic number or not.

Here first while loop will count the total number of digits in a given number.

And second while loop will iterate the Integer and print each digit as an output.

and Finally we will print the digit and place values as shown in image above.

Java Program to display prime numbers between 1 and 100 or 1 and n

In this tutorial, we will learn to create a Java Program to display prime numbers between 1 and 100 or 1 and n 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.
User Define functions

What is Prime Number?

A number is called a Prime number if a number is divisible by 1 or itself only.
For example 2, 3, 5, 7, 11, 13, 17..are some prime numbers.

Java Program to display prime numbers between 1 and 100 or 1 and n

In this program we would print the prime numbers between 1 and 100 .First of all we take the value of N form user and find prime number from 1 to N.Let have a look at the code.

// java program to find prime number from 1 to n
import java.util.Scanner;
class Prime_number
{
	public static void main(String arg[]){
	// Decalring variables and taling values from user..
	int i,count;
    System.out.print("Enter the value of N : ");
	Scanner sc=new Scanner(System.in);
	int number=sc.nextInt();
	// Printing the result...
    System.out.println("Prime numbers between 1 to "+number+" are ");
	for(int j=2;j<=number;j++)
	{
	count=0;
	for(i=1;i<=j;i++)
	{
	   if(j%i==0)
	   {
	        count++;        
	   }
	}
	if(count==2)
	       System.out.print(j+"  ");     
	}
	}
}

// java program to find prime number from 1 to n

import java.util.Scanner;

class Prime_number

{

public static void main(String arg[]){

// Decalring variables and taling values from user..

int i,count;

System.out.print("Enter the value of N : ");

Scanner sc=new Scanner(System.in);

int number=sc.nextInt();

// Printing the result...

System.out.println("Prime numbers between 1 to "+number+" are ");

for(int j=2;j<=number;j++)

{

count=0;

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

{

if(j%i==0)

{

count++;

}

if(count==2)

System.out.print(j+" ");

}

Output

Prime number From 1 – N.

Prime number From 1 – 50

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

number= it will hold entered number.
count= it will show number is prime or not
i and j = for iteration.

After declaring variables we take a value from user and print prime number from 1 – N.

Algorithm

1: START
2: declare variables count =0, number, i=1,j=1.
3: Take value of number from user
4: SET j= 1
5: SET count = 0
6: if i%j = = 0 then count ++
7: j = j + 1
8: if count= 2 then print the value of i.
9: number++.
10: i = i +1
11: END

Simply here we check each and every value form 1 to N and print only values those satisfied the logic of a prime number it means number which divisible by itself only are prime numbers..

and in that manner we print all prime number between 1 – n or 100.

Java Program to display first 100 prime numbers

In this tutorial, we will learn to create a Java Program to display first 100 prime numbers 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.
User Define functions

What is Prime Number?

A number is called a Prime number if a number is divisible by 1 or itself only.
For example 2, 3, 5, 7, 11, 13, 17..are some prime numbers.

Java Program to display prime numbers between 1 and 100 or 1 and n

In this program we would print the prime numbers between 1 and 100 .First of all we declare variables and then find prime number from 1 to 100.Let have a look at the code.

// java program to find prime number from 1 to 100
import java.util.Scanner;
class Prime_number
{
	public static void main(String arg[]){
	// Decalring variables and taling values from user..
	int i,count;
	// Printing the result...
    System.out.println("Prime numbers between 1 to 100 are ");
	for(int j=2;j<=100;j++)
	{
	count=0;
	for(i=1;i<=j;i++)
	{
	   if(j%i==0)
	   {
	        count++;        
	   }
	}
	if(count==2)
	       System.out.print(j+"  ");     
	}
	}
}

// java program to find prime number from 1 to 100

import java.util.Scanner;

class Prime_number

{

public static void main(String arg[]){

// Decalring variables and taling values from user..

int i,count;

// Printing the result...

System.out.println("Prime numbers between 1 to 100 are ");

for(int j=2;j<=100;j++)

{

count=0;

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

{

if(j%i==0)

{

count++;

}

if(count==2)

System.out.print(j+" ");

}

Output

Prime number From 1 – 100.

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

count= it will show number is prime or not
i and j = for iteration.

After declaring variables we take a value from user and print prime number from 1 – N.

Algorithm

1: START
2: declare variables count =0, i=1,j=1.
3: SET j= 1
4: SET count = 0
5: if i%j = = 0 then count ++
6: j = j + 1
7: if count= 2 then print the value of i.
8: i = i +1
9: END

Simply here we check each and every value form 1 to 100 and print only values those satisfied the logic of a prime number it means number which divisible by itself only are prime numbers..

and in that manner we print all prime number lies between 1 -100 in our program.

Java Program to print Floyd’s triangle

Java Program to print Floyd’s triangle.

In this tutorial, we will learn to create a Java Program to print Floyd’s triangle 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.
For loop in Java Programming.

Floyd’s Triangle:-

Floyd’s triangle is a right-angled triangle that contains mathematical numbers from 1 and goes up to the required point.

Printing a Floyd’s:-

The Java language is a very powerful programming language. In Java programming, we can perform many operations with the help of coding’s. Java is a very easy language to create any shape. In this program, we will learn to create Floyd’s triangle with the help of some code.

Algorithm:-

STEP 1: START the program

STEP 2: first declare the variables

STEP 3: then start the parent for loop

STEP 4: now make the child for loop

STEP 5: now use child loop to start drawing the Floyd's

STEP 6: Now this for loop will also execute under the parent for loop

STEP 7: Print "\n" for changing the line before the increment of the main loop

STEP 8: increment of the main for loop

STEP 9: return the zero value for main function

STEP 1: START the program

STEP 2: first declare the variables

STEP 3: then start the parent for loop

STEP 4: now make the child for loop

STEP 5: now use child loop to start drawing the Floyd's

STEP 6: Now this for loop will also execute under the parent for loop

STEP 7: Print "\n" for changing the line before the increment of the main loop

STEP 8: increment of the main for loop

STEP 9: return the zero value for main function

Program:-

To print a Floyd’s Triangle

// Java program to display Floyd's triangle

// Importing Java libraries
import java.util.*;

// Main class
class FlyTri {

	// Main driver method
	public static void main(String[] args)	{
	    // Declaring the variables for the program.
	    int no,i,j,k;
		// No of rows to be printed
		no = 5;

		// Creating and initializing variable for
		// rows, columns and display value
		int i, j, k = 1;

		// Nested iterating for 2D matrix
		// Outer loop for rows
		for (i = 1; i <= no; i++) {

			// Inner loop for columns
			for (j = 1; j <= i; j++) {

				// Printing value to be displayed
				System.out.print(k + " ");

				// Incremeting value displayed
				k++;
			}

			// Print elements of next row
			System.out.println();
		}
	}
}

// Java program to display Floyd's triangle

// Importing Java libraries

import java.util.*;

// Main class

class FlyTri {

// Main driver method

public static void main(String[] args) {

// Declaring the variables for the program.

int no,i,j,k;

// No of rows to be printed

no = 5;

// Creating and initializing variable for

// rows, columns and display value

int i, j, k = 1;

// Nested iterating for 2D matrix

// Outer loop for rows

for (i = 1; i <= no; i++) {

// Inner loop for columns

for (j = 1; j <= i; j++) {

// Printing value to be displayed

System.out.print(k + " ");

// Incremeting value displayed

k++;

}

// Print elements of next row

System.out.println();

}

Output:-

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

i = it will hold the integer value to control parent for loop.
j = it will hold the integer value to control child for loop.
k = it will hold the integer value to control child for loop.
no = it will hold the integer value for the number of rows.

Taking input Number of rows

Nested For loop the body of the program

Printing Numbers

Java Program to Print 2D array

In this tutorial, we will learn to create a Java Program to Print 2D array 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.

What is 2D Array[]?

Multidimensional Arrays Or 2D array defined as in simple words as “array of arrays”.

For example:
The array int[][] a = new int[5][5] can store a total of (5*5) = 25 elements.

Java Program to Print 2D array

In this program we would simply print a “2d” array .first of we would declare variables and called a function to display all the value of array[].let have a look at the code

//Java program to print 2d aaray
import java.util.*;

class Array2D { 
  
    public static void Printing_String(int arr[][]) 
    { 
// printing the array values..
        for (int n = 0 ; n < arr.length ; n++)
        {
            System.out.println(Arrays.toString(arr[n])); 
        } 
            
    } 
  // Main function
    public static void main(String args[])
    { 
   //declaring 2d array
        int arr[][] = { { 1, 2, 3 }, 
                        { 4, 5, 6 }, 
                        { 7, 8, 9 } }; 
        Printing_String(arr); // passing value to function()
    } 
}

//Java program to print 2d aaray

import java.util.*;

class Array2D {

public static void Printing_String(int arr[][])

{

// printing the array values..

for (int n = 0 ; n < arr.length ; n++)

{

System.out.println(Arrays.toString(arr[n]));

}

// Main function

public static void main(String args[])

{

//declaring 2d array

int arr[][] = { { 1, 2, 3 },

{ 4, 5, 6 },

{ 7, 8, 9 } };

Printing_String(arr); // passing value to function()

}

Output

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

arr[] = it will hold array values.
n= for iteration

After declaring variables we pass the array to function Printing_String().

where we simply print the array value using for loop.

Java Program to Print Odd and Even Numbers from an array

In this tutorial, we will learn to create a Java Program to Print Odd and Even Numbers from an array 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 Even and Odd Number.

A number which is divisible by 2 is called even number (number%2==0) after dividing 2 remainder remain zero.
A number which is not divisible by 2 is called an odd number (number%2 !=0) after dividing 2 remainder remains.

Java Program to Print Odd and Even Numbers from an array

In this program we will find number in an array are even or odd using if else statement and loop. We would first declared and initialized the required variables. Next, we will find that number is even or odd.lets have a look at the code.

// java program to find even odd in a n array[]
public class OddevenArray {
   public static void main(String args[]){
  // declaring variables 
      int[] arr = {2, 3, 4, 5, 6};
      System.out.println(" Even numbers in the given array are:: ");
// Finding even in a an array
      for (int i=0; i<arr.length; i++){
         if(arr[i]%2 == 0){
            System.out.println(arr[i]);
         }
      }
      System.out.println("Odd numbers in the given array are:: ");
// Finding odd in an array[]
      for (int i=0; i<arr.length; i++){
         if(arr[i]%2 != 0){
            System.out.println(arr[i]);
         }
      }
   }
}

// java program to find even odd in a n array[]

public class OddevenArray {

public static void main(String args[]){

// declaring variables

int[] arr = {2, 3, 4, 5, 6};

System.out.println(" Even numbers in the given array are:: ");

// Finding even in a an array

for (int i=0; i<arr.length; i++){

if(arr[i]%2 == 0){

System.out.println(arr[i]);

}

System.out.println("Odd numbers in the given array are:: ");

// Finding odd in an array[]

for (int i=0; i<arr.length; i++){

if(arr[i]%2 != 0){

System.out.println(arr[i]);

}

Output

Even and odd in an array.

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

arr= it will hold array values
i= for iteration .

After declaring variables we initiate values in a an array[].

Algorithm

Declare an array and an element in array[].
within the loop find element even or odd applying condition separate for even a shown in image below.

Print the even elements by checking the conditions using for loop.

within the loop find element even or odd applying condition separate for odd a shown in image below.

this is the source code of the Java Program to Print the Odd & Even Numbers in an Array.

Java Program to Remove Duplicate Element in an array

In this tutorial, we will learn to create a Java Program to Remove Duplicate Element in an array 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.

Java Program to Remove Duplicate Element in an array

In this program we will find duplicate element in an array if-else statement and loop. We would first declared and initialized the required variables. Next, we will find repeated number in an array.lets have a look at the code.

// Java Program to Remove Duplicate Elements

public class Duplicate {

	public static int remove(int arr[], int size)
	{
		if (size == 0 || size == 1) {
			return size;
		}

		// creating another array and removing duplicate elements
		int[] temp = new int[size];
		int j = 0;

		for (int i = 0; i < size - 1; i++) {
			if (arr[i] != arr[i + 1]) {
				temp[j++] = arr[i];
			}
		}
		temp[j++] = arr[size - 1];

	
		for (int i = 0; i < j; i++) {
			arr[i] = temp[i];
		}

		return j;
	}
	public static void main(String[] args)
	{
		int arr[] = { 1, 1, 2, 2, 3, 4};
		int number = arr.length;

		number = remove(arr, number);

		// Printing The array elements
		System.out.println("printing removed duplicate array elements  ");
		for (int i = 0; i < number; i++)
			System.out.print(arr[i] + " ");
	}
}

// Java Program to Remove Duplicate Elements

public class Duplicate {

public static int remove(int arr[], int size)

{

if (size == 0 || size == 1) {

return size;

}

// creating another array and removing duplicate elements

int[] temp = new int[size];

int j = 0;

for (int i = 0; i < size - 1; i++) {

if (arr[i] != arr[i + 1]) {

temp[j++] = arr[i];

}

temp[j++] = arr[size - 1];

for (int i = 0; i < j; i++) {

arr[i] = temp[i];

}

return j;

}

public static void main(String[] args)

{

int arr[] = { 1, 1, 2, 2, 3, 4};

int number = arr.length;

number = remove(arr, number);

// Printing The array elements

System.out.println("printing removed duplicate array elements ");

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

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

}

Output

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

arr= it will hold array values
number and size= it will hold length of an array.
i and j for iteration
temp = it will hold temporary value of an array.

After declaring variables we initiate values in an array[].

and with the help length we find the length of an array.

Now we will pass arr[] and length to remove() method where we remove duplicate values within the array[].

Steps to remove duplicate elements

Create a temp array temp[] to store unique values of elements.
travel through array and copy all the unique elements of arr[] to temp[]. and count unique elements.
Copy j elements from temp[] to arr[].

and finally print sorted array.

Java to Program Find Smallest Number in an array

In this tutorial, we will learn to create a Java to Program Find 2nd Smallest Number in an array 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.

Java to Program Find Smallest Number in an array

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

//java program to find smallest among the array..
import java.io.*;
public class Smallest_in_An_Array {
   public static void main(String args[]){
// declaring variables and initilainzing values 
      int temp, l;
      int arr[] = {10, 20, 25, 30, 12, 5}; // assign values to array
      l = arr.length; // finding length of an array
      for(int i = 0; i<l; i++ )
       { 
        for(int j = i+1; j<l; j++)
         {
            if(arr[i]>arr[j]){
               temp = arr[i];
               arr[i] = arr[j];
               arr[j] = temp;
            }
         }
      }
//Printing the result..
System.out.println("Smallest element in an array is "+arr[0]);
   }
}

//java program to find smallest among the array..

import java.io.*;

public class Smallest_in_An_Array {

public static void main(String args[]){

// declaring variables and initilainzing values

int temp, l;

int arr[] = {10, 20, 25, 30, 12, 5}; // assign values to array

l = arr.length; // finding length of an array

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

{

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

{

if(arr[i]>arr[j]){

temp = arr[i];

arr[i] = arr[j];

arr[j] = temp;

}

//Printing the result..

System.out.println("Smallest element in an array is "+arr[0]);

}

Output

Smallest in an array

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

arr[]= it will hold array values
l= it will hold length of an array.
i and j for iteration
temp = it will hold temporary value of an array.

After declaring variables we initiate values in an array[]

with the help of length function we will find the length of an array .

after that with the help or nested for loop we will find smallest element in array as shown in image below

Smallest in an array

Here first we assign first value of an array to variable temp.
Compare the first two elements of the array.
If the value of first element is greater than the second exchange them.
Then, compare 2 value and 3 value elements if the second element value is greater than the 3 value swap them.
Repeat this till the end of the array[].
and finally print smallest in an array.

Java Program to Find Largest Number in an array

In this tutorial, we will learn to create a Java Program to Find Largest Number in an array 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.

Java Program to Find Largest Number in an array

//java program to find greatest among the array..
import java.io.*;
public class Largest_in_An_Array {
   public static void main(String args[]){
// declaring variables and initializing values
      int temp, l;
      int arr[] = {10, 20, 25, 30, 12, 5};// assign values to array
      l = arr.length;
      for(int i = 0; i<l; i++ ){// finding length of an array
         for(int j = i+1; j<l; j++){
            if(arr[i]<arr[j]){
               temp = arr[i];
               arr[i] = arr[j];
               arr[j] = temp;
            }
         }
      }
//Printing the result..
System.out.println("largest element in an array is "+arr[0]);
   }
}

//java program to find greatest among the array..

import java.io.*;

public class Largest_in_An_Array {

public static void main(String args[]){

// declaring variables and initializing values

int temp, l;

int arr[] = {10, 20, 25, 30, 12, 5};// assign values to array

l = arr.length;

for(int i = 0; i<l; i++ ){// finding length of an array

for(int j = i+1; j<l; j++){

if(arr[i]<arr[j]){

temp = arr[i];

arr[i] = arr[j];

arr[j] = temp;

}

//Printing the result..

System.out.println("largest element in an array is "+arr[0]);

}

Output

Largest in an array

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

arr[]= it will hold array values
l= it will hold length of an array.
i and j for iteration
temp = it will hold temporary value of an array.

After declaring variables we initiate values in an array[]

with the help of length function we will find the length of an array .

after that with the help or nested for loop we will find smallest element in array as shown in image below

Largest in an array

Here first we assign first value of an array to variable temp.
Compare the first two elements of the array.
If the value of first element is smaller than the second exchange them.
Then, compare 2 value and 3 value elements if the second element value is smaller than the 3 value swap them.
Repeat this till the end of the array[].
and finally print largest in an array.

Java Program to Find 2nd Largest Number in an array

In this tutorial, we will learn to create a Java Program to Find 2nd Largest Number in an array 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.

Java Program to Find 2nd Largest Number in an array

//java program to fing 2nd largest in  an array
public class Second{  
public static int Second_Largest(int[] a, int size){  
//declaring variables in sorting array
int temp;  
for (int i = 0; i < size; i++)   //sorting array
        {  
            for (int j = i + 1; j < size; j++)   
            {  
                if (a[i] > a[j])   
                {  
                    temp = a[i];  
                    a[i] = a[j];  
                    a[j] = temp;  
                }  
            }  
        }  
       return a[size-2];  //finding second largest in an array.
}  
public static void main(String args[]){  
int a[]={1,2,5,6,3};  //initialize values..
//Printing result..
System.out.println("Second Largest: "+Second_Largest(a,5));  
}
}

//java program to fing 2nd largest in an array

public class Second{

public static int Second_Largest(int[] a, int size){

//declaring variables in sorting array

int temp;

for (int i = 0; i < size; i++) //sorting array

{

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

{

if (a[i] > a[j])

{

temp = a[i];

a[i] = a[j];

a[j] = temp;

}

return a[size-2]; //finding second largest in an array.

}

public static void main(String args[]){

int a[]={1,2,5,6,3}; //initialize values..

//Printing result..

System.out.println("Second Largest: "+Second_Largest(a,5));

}

Output

2nd Large

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

a[]= it will hold array values
l= it will hold length of an array.
i and j for iteration
temp = it will hold temporary value of an array.

After declaring variables we initiate values in an array[]

here we will call a function where we fin second greatest in an array[].

2nd Largest in an array

- Compare the first two elements of the array
- If the first element is greater than the second exchange them.
- Then, compare 2nd and 3rd elements if the second element is greater than the 3rd swap them.
- Repeat this till the end of the array.
- and at last function return a[size-2];
- which is the second largest in an array[].

and finally we will print the result it means the second largest in an array[].

Java Program to Find 3rd Largest Number in an array

In this tutorial, we will learn to create a Java Program to Find 3rd Largest Number in an array 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.

Java Program to Find 3rd Largest Number in an array

//java program to fing 3rd largest in  an array
public class Third{  
public static int Third_Largest(int[] a, int size){  
//declaring variables in sorting array
int temp;  
for (int i = 0; i < size; i++)   //sorting array
        {  
            for (int j = i + 1; j < size; j++)   
            {  
                if (a[i] > a[j])   
                {  
                    temp = a[i];  
                    a[i] = a[j];  
                    a[j] = temp;  
                }  
            }  
        }  
       return a[size-3];  //finding third largest in an array.
}  
public static void main(String args[]){  
int a[]={1,2,5,6,3};  //initialize values..
//Printing result..
System.out.println("Third Largest in an array: "+Third_Largest(a,5));  
}
}

//java program to fing 3rd largest in an array

public class Third{

public static int Third_Largest(int[] a, int size){

//declaring variables in sorting array

int temp;

for (int i = 0; i < size; i++) //sorting array

{

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

{

if (a[i] > a[j])

{

temp = a[i];

a[i] = a[j];

a[j] = temp;

}

return a[size-3]; //finding third largest in an array.

}

public static void main(String args[]){

int a[]={1,2,5,6,3}; //initialize values..

//Printing result..

System.out.println("Third Largest in an array: "+Third_Largest(a,5));

}

Output

3rd Largest in an array[].

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

a[]= it will hold array values
l= it will hold length of an array.
i and j for iteration
temp = it will hold temporary value of an array.

After declaring variables we initiate values in an array[]

here we will call a function where we fin second greatest in an array[].

3rd Largest in an array

- Compare the first two elements of the array
- If the first element is greater than the second exchange them.
- Then, compare 2nd and 3rd elements if the second element is greater than the 3rd swap them.
- Repeat this till the end of the array.
- and at last function return a[size-3];
- which is the second largest in an array[].

and finally we will print the result it means the second largest in an array[].

Java Program to sort the elements of an array in descending order

In this tutorial, we will learn to create a Java Program to sort the elements of an array in descending order 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.

Sorting in a an array[]

Sorting elements means to arrange elements within the array in a certain specific order. either Ascending(increasing) or descending(decreasing) order.

Java Program to sort the elements of an array in ascending order

In this program we will take size of an array and sort the elements of an array using nested for loop. We would first declared and initialized the required variables. Next, we will sort the elements in an array. Lets have a look at the code.

//java program to print array in decending order
import java.util.Scanner;
public class Descending {
    public static void main(String[] args) {
        int number, temp;
        Scanner s = new Scanner(System.in);
        System.out.print("Enter elements you want in array:");
        number = s.nextInt();
        int a[] = new int[number];
        System.out.println("Enter all the elements:");
        for (int i = 0; i < number; i++) {
            a[i] = s.nextInt();
        }
        for (int i = 0; i < number; i++) {
            for (int j = i + 1; j < number; j++) {
                if (a[i] < a[j]) {
                    temp = a[i];
                    a[i] = a[j];
                    a[j] = temp;
                }
            }
        }
        System.out.print("Descending Order:");
        for (int i = 0; i < number - 1; i++)
        {
            System.out.print(a[i] + ",");
        }
        System.out.print(a[number - 1]);
    }
}

//java program to print array in decending order

import java.util.Scanner;

public class Descending {

public static void main(String[] args) {

int number, temp;

Scanner s = new Scanner(System.in);

System.out.print("Enter elements you want in array:");

number = s.nextInt();

int a[] = new int[number];

System.out.println("Enter all the elements:");

for (int i = 0; i < number; i++) {

a[i] = s.nextInt();

}

for (int i = 0; i < number; i++) {

for (int j = i + 1; j < number; j++) {

if (a[i] < a[j]) {

temp = a[i];

a[i] = a[j];

a[j] = temp;

}

System.out.print("Descending Order:");

for (int i = 0; i < number - 1; i++)

{

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

}

System.out.print(a[number - 1]);

}

Output

Sorted elements in an array.

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

arr[]= it will hold array values
number = it will hold length of an array.
i = for iteration.
temp = it will hold temporary value of an array.

After declaring variables we initiate values in an array[]

Elements will be sorted in Descending order .As shown in the image below.

Algorithm to sort array in descending order.

Start the algo
Declare an array[].
Taking size and element of an array from user.
Declared a temp variable to store the elements for swapping.

Here first for loop will hold the elements and traverse through all the elements.

Second for loop to compare with the remaining elements.
Sort the elements by comparing.
Display the updated array.
Stop

The above program shows sort an array in descending order using for loops .