Array in palindrome or not

import java.util.*;

public class Main {
    public static void main(String[] args) {
      Scanner input=new Scanner(System.in);
      int a[]={1,2,3,4,3,2,1};
      boolean flag=true;
      int i=0;
      int j=a.length-1;
      while(i<j){
        if(a[i]!=a[j]){
          flag=false;
          break;
          
        }
        i++;
          j--;
      }
      System.out.println(flag);
  }
}