wtf?java的冒泡排序还可以这样写

package com.moshang;
public class Bumble {
  int a[];
  public Bumble(int a[]){
    this.a=a;
    int temp;
    for(int i=a.length-1;i>0;i--){
      @SuppressWarnings("unused")
      boolean flag=false;
      for(int j=1;j<=i;j++){
        if(a[j-1]>a[j]){
          temp=a[j-1];
          a[j-1]=a[j];
          a[j]=temp;
          flag=true;
        }
        if(flag=false){return;}
      }
    }
  }
  void show(){    
    for(int k=0;k<a.length;k++){
    System.out.print(a[k]+" ");
    }
}
  public static void main(String[] args) {
    int a[]={5,1,9,10,20,55,0,66};
    Bumble b=new Bumble(a);
    b.show();
  }
}