Selection, Bubble, Insertion Sort in Java

import java.util.Arrays;

public class SortingDemo {
    public static void main(String... args){
            int a[]={2,1,3,5,4,8,7,9,6};
            System.out.println("Before Sorting :"+ Arrays.toString(a));
            insertionSort(a);
            System.out.println("After Sorting :"+ Arrays.toString(a));
    }
    public static void selectionSort(int... arr){
            for(int i=0;i<arr.length-1;i++){
                    for(int j=i+1;j<arr.length;j++){
                        if(arr[i]>arr[j]){
                            int temp=arr[i];
                            arr[i]=arr[j];
                            arr[j]=temp;
                        }

                    }
            }
    }
    public static void bubbleSort(int... a){
            for(int i=0;i<a.length;i++){
                for(int j=0;j<a.length-i-1;j++){
                    if(a[j]>a[j+1]){
                        int temp=a[j];
                        a[j]=a[j+1];
                        a[j+1]=temp;
                    }
                }
            }
    }
    public static void insertionSort(int... arr){
            for(int i=1;i<arr.length;i++){
                int j=i-1;
                int temp=arr[i];
                while(j>=0 && temp<arr[j]){
                    arr[j+1]=arr[j];
                    j--;
                }
                arr[j+1]=temp;
            }
    }
}