Does Java Pass by Reference or by Value?

Question

I'm confused about this, please explain
thanx

Answer 1

Ok new to programming them don't listen to people who say that everything is passed by value, it's just some terminology debate that you don't need to care about at first.
Here are some examples from which you can try to figure out:
Example 1, the primitives:
public class TestPrimitive
    public static void main(String[] args)
        int value = 5;
        foo(value);
        System.out.println(value);
    public static void foo(int value)
        value = 3;
        System.out.println(value);
}The output will be:
3
5
showing that the variable "value" was passed by value and therefore was not modified in the calling code by the alteration in the foo method.
Example 2, the arrays:
public class TestArray
    public static void main(String[] args)
        int[] array = new int[2];
        array[0] = 0;
        array[1] = 1;
        foo(array);
        System.out.println(String.valueOf(array[0]) + " " + array[1]);
    public static void foo(int[] array)
        array[0] = 3;
        array[1] = 4;
        System.out.println(String.valueOf(array[0]) + " " + array[1]);
}The output will be:
3 4
3 4
This mean that change to the array content get reflected in the calling code
Example 3, the arrays part 2:
public class TestArray
    public static void main(String[] args)
        int[] array = new int[2];
        array[0] = 0;
        array[1] = 1;
        foo(array);
        System.out.println(String.valueOf(array[0]) + " " + array[1]);
    public static void foo(int[] array)
        array = new int[2];
        array[0] = 3;
        array[1] = 4;
        System.out.println(String.valueOf(array[0]) + " " + array[1]);
}The output will be:
3 4
0 1
Here is why people say everything is passed by value in Java, because if you make the array variable in the foo method to point on a new array, the one in the calling block continue to point on the old one, which is why it keep its [0,1} value.
Object work exactly like arrays.
Clear enough?