// Client program to explore reference semantics
public class ReferenceExample {

   public static void main(String[] args) {
      // Example 1: Primitives
      int a = 4;
      int b = a;
      a = 7;
      
      System.out.println("a = " + a);
      System.out.println("b = " + b);
      System.out.println();
      
      
      
      
      // Example 2: Objects (References)
      Point s = new Point(1, 2);
      Point t = s;
      s = new Point(3, 4);
      
      System.out.println("s = " + s);
      System.out.println("t = " + t);
      System.out.println();
      
      t.setX(0);
      System.out.println("s = " + s);
      System.out.println("t = " + t);
      System.out.println();

   }
   
   
   // pollev.com/cse143
   // How many Point objects exist in this method?
   // What is the output of this method?
   public static void poll1() {
      Point p = new Point(1, 2);
      Point q = p;
      Point r = q;
      q = new Point(4, 5);
      r.setX(3);
      System.out.println("p = " + p);
      System.out.println("q = " + q);
      System.out.println("r = " + r);
   }
}