// Array Compare gotchas

import java.util.Arrays;
...
int[] a = new int[]{ 10, 20};
int[] b = new int[]{ 10, 20};

// gives "wrong" answer: false, compares for same object
out.println( a == b );

// gives "wrong" answer: false, compares for same object
out.println( a.equals( b ) );

// gives correct answer: true, equal if all elements equal.
out.println( Arrays.equals( a, b ) );