Pointers as Value parameters code in java ~ java help

import java.awt.Rectangle;

public class ObjectVarsAsParameters
{ public static void main(String[] args)
 { go();
 }
 
 public static void go()
 { Rectangle r1 = new Rectangle(0,0,5,5);
  System.out.println("In method go. r1 " + r1 + "\n");
  // could have been 
  //System.out.prinltn("r1" + r1.toString());
  r1.setSize(10, 15);
  System.out.println("In method go. r1 " + r1 + "\n");
  alterPointee(r1);
  System.out.println("In method go. r1 " + r1 + "\n");
  
  alterPointer(r1);
  System.out.println("In method go. r1 " + r1 + "\n");
 }
 
 public static void alterPointee(Rectangle r)
 { System.out.println("In method alterPointee. r " + r + "\n");
  r.setSize(20, 30);
  System.out.println("In method alterPointee. r " + r + "\n");
 }
 
 public static void alterPointer(Rectangle r)
 { System.out.println("In method alterPointer. r " + r + "\n");
  r = new Rectangle(5, 10, 30, 35);
  System.out.println("In method alterPointer. r " + r + "\n");
 }
 
 
}