Java – the best way to copy from one array to another

When I run the following code, there is no copy - what did I do wrong?

In addition, is this the best / most effective way to copy data from one array to another?

public class A {
    public static void main(String args[]) {
        int a[] = { 1,2,3,4,5,6 };
        int b[] = new int[a.length];

        for (int i = 0; i < a.length; i++) {
            a[i] = b[i];
        }
    }
}

Solution

I think your task is backward:

a [i] = b [i];

should:

b [i] = a [i];