Sorting Operations on Arrays in Java

☞Sorting is process of arranging data in some logical order.

☞This logical order may be ascending or descending in case of numeric values or dictionary order in case of alphanumeric values.

☞We can perform following sorting operations on an array.

1. Bubble Sort
2. Selection Sort

Bubble Sort in Java

☞Logic starts with comparison of first two elements and if the left element is greater than right element, they swap their position. Comparison proceeds till the end of the array.

Example

import java.util.*;
class BubbleSort{
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
            
        System.out.println("Enter the size");
        int size=sc.nextInt();
            
        int arr[]=new int[size];
        
        int i,temp;
        
        /*inputting elements in an array*/
        System.out.println("Enter the elements");
        for(i=0;i<arr.length;i++)
            arr[i]=sc.nextInt();
        
        /*logic of bubble sort*/
        for(int round=1;round<=arr.length-1;round++){
            
            /*check the element with the next element according to rounds*/
            for(i=0;i<=arr.length-1-round;i++){
                if(arr[i]>arr[i+1]){
                
                    /*swap the current element with the next element*/
                    temp=arr[i];
                    arr[i]=arr[i+1];
                    arr[i+1]=temp;
                }
            }
        }
        
        /*Printing in ascending order*/
        System.out.println("The numbers in ascending order are: ");
        for(i=0;i<arr.length;i++)
            System.out.print(arr[i]+" ");
    }
}

Output

Enter the size
5
Enter the elements
74
47
84
34
63
The numbers in ascending order are
34 47 63 74 84
Note :
1. Your array will get sorted in (Number of elements - 1) round.
2. By default array must be sorted in ascending order.