// Helene Martin, CSE 142
// In Java, primitive types use value semantics so assignment results 
// in copying a value. Object types use reference semantics so assignment
// results in copying a REFERENCE (memory location) to an object.

// Below, the variables array1 and array2 hold the same memory location: 
// they refer to the same array.

import java.util.*;

public class ReferenceValueSemantics {
	public static void main(String[] args) {
		int a = 12;
		int b = a;
		b = 5; // only changes b
		System.out.println(a + " " + b);
		
		int[] array1 = {1, 2, 3, 4};
		int[] array2 = array1;
		
		array2[0] = 555; // changes array2[0] AND array1[0]
		
		System.out.println(Arrays.toString(array1));
		System.out.println(Arrays.toString(array2));		
	}
}