public class Reference {
	public static void main(String[] args) {
		int[] a = {1};
		int[] b = {2};
		
		System.out.println("a[0]: " + a[0]);
		System.out.println("b[0]: " + b[0]);
		
		a = b;
		a[0] = 3;
		System.out.println();
		
		System.out.println("a[0]: " + a[0]);
		System.out.println("b[0]: " + b[0]);
	}
}