Help tracing code

Question

can anyone help me out with tracing this code. I have the answers at the bottom its just that im not really understanding how to do it, if anyone could help that would be great. thanks.
public class ParamTest {
static void f(int[] a, int[] b, int[][] c) {
int x;
x = a[0];
a[0] = a[1];
a[1] = x;
c[0] = c[1];
c[1] = b;
b[0] = 7;
b = new int[2];
b[0] = 8;
b[1] = 9;
c[0][0] = a[0];
public static void main(String[] args) {
int[] x1 = {0,1};
int[][] x2 = {{2,3},{4,5}};
f(x1, x2[0], x2);
               System.out.println(� x1[0]: � + x1[0] +
                                                                                     � x1[1]: � + x1[1] );
               System.out.println(� x2[0][0]: � + x2[0][0] +
                                                                                     � x2[0][1]: � + x2[0][1] +
     � x2[1][0]: � + x2[1][0] +
                                                                                     � x2[1][1]: � + x2[1][1] );
// answers
x1[0]:_1___ x1[1]:_0___
x2[0][0]:_1___ x2[0][1]:_5___ x2[1][0]: _7___ x2[1][1]: _3___

Answer 1

Do you not understand the code itself or why it's failing?
If the first, I can't really help you.. it's crucial that you understand what the code is supposed to be doing.
If the second, my advice would be to use the following:
System.out.println(someStringHere)after every line of code to verify that the values of each variable are what you expect them to be.