How to do call by reference in Java?

Question

Since Java doesnt support pointers, How is it possible to call a function by reference in Java like we do in C and C++??

Answer 1

package jgf;

public class TestJavaParams {

 public static void main(String[] args) {
    int[] counter1 = new int[1];
    counter1[0] = 0;
    System.out.println(counter1[0]);
    doAdd1(counter1);
    System.out.println(counter1[0]);
    int counter2 = 0;
    System.out.println(counter2);
    doAdd2(counter2);
    System.out.println(counter2);   
  }

  public static void doAdd1(int[] counter1) {
    counter1[0] += 1;
  }

  public static void doAdd2(int counter2) {
    counter2 += 1;
  }
}

Output would be:

0
1
0
0