Why transpose of matrix is not happen?? In the code

Question

public class Program {
public static void main(String[] args) {
int a[][]={{1,2,3},{4,5,6},{7,8,9}};
for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
a[i][j]=a[j][i];
System.out.print(a[i][j]);
}
System.out.println();
}
}
}

Answer 1

Link to your full code instead pls

Answer 2

Please don't link an incomplete code.