pass by reference example.java for a medium article https://medium.com/@moussa.ahmed95/we-were-deceived-by-the-java-documentation-and-here-is-the-why-638bcc49f83c

pass by reference example.java

/**
 *
 * @author Ahmed Moussa
 */
public class JavaApplication1 {
    
    String name;
    int age;
    
    public JavaApplication1() {
        name = "empty";
        age = 0;
    }
    
    @Override
    public String toString() {
        return "name: " + name + ", age: " + age;
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        JavaApplication1 x = new JavaApplication1();
        System.out.println(x.toString()); // name: empty, age: 0
        changeName(x);
        System.out.println(x.toString()); // name: Ahmed Moussa, age: 0
        changeAge(x);
        System.out.println(x.toString()); // name: Ahmed Moussa, age: 23
    }
    
    public static void changeName(JavaApplication1 obj) {
        obj.name = "Ahmed Moussa";
    }
    
    public static void changeAge(JavaApplication1 obj) {
        obj.age = 23;
    }
    
}