Bubble Sort in Java

 package code.example.basic;

public class BubbleSortExample {
    
    public static void main(String args[]){
        int ar[]={4,5,6,7,3,4,2};
        
        for(int i=0;i<ar.length;i++){
            for(int j=0;j<(ar.length-1)-i;j++){
                if(ar[j]>ar[j+1]){
                    ar[j]= ar[j]+ar[j+1]-(ar[j+1]=ar[j]);
                }
            }
            for(int k=0;k<ar.length;k++){
                System.out.print(ar[k]);//this print only understanding
            }
            System.out.println("-");//this print only understanding
        }
        for(int i=0;i<ar.length;i++){
            System.out.println(ar[i]);
        }
    }
} 

(ar.length-1)-i -- This code used for optimization