/*
 * ArrayParametersDemo.java
 *
 * This program demonstrates some of the consequences of the fact that arrays
 * are passed by reference.
 *
 * Copyright (c) 2000 - Russell C. Bjork
 *
 */
 
public class ArrayParametersDemo
{
    public static void main(String [] args)
    {
		int v = 42;
        int [] array1 = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
        int [] array2 = { 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 };
        
		System.out.println("Before call to foo()");
        System.out.println("v      = " + v);
        printArray("array1", array1);
        printArray("array2", array2);
        
        foo(v, array1, array2);
        
		System.out.println("After call to foo()");
        System.out.println("v      = " + v);
        printArray("array1", array1);
        printArray("array2", array2);
    }
      
    private static void printArray(String label, int [] array)
    {
        System.out.print(label + " = ");
        for (int i = 0; i < array.length; i ++)
        	System.out.print(array[i] + " ");
        System.out.println();
    }
      
    private static void foo(int x, int [] a1, int [] a2)
    {
        int [] a3 = { 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 };

        x ++;
        a1 = a3;
        for (int i = 0; i < a2.length; i ++)
            a2[i] *= 2;
    }
}