CS61B_discussion3_week2_2

 1 public class Horse {
 2     Horse same;
 3     String jimmy;
 4     
 5     public Horse(String lee) {
 6         jimmy = lee;
 7     }
 8     
 9     public Horse same(Horse horse) {
10         if (same != null) {
11             Horse same = horse;
12             same.same = horse;
13             same = horse.same;
14     }
15         return same.same;
16     }
17     
18     public static void main(String[] args) {
19         Horse horse = new Horse("youve been");
20         Horse cult = new Horse("horsed");
21         cult.same = cult;
22         cult = cult.same(horse);
23         System.out.println(cult.jimmy);
24         System.out.println(horse.jimmy);
25     }
26   }

 1 public class Foo {
 2     public int x, y;
 3     public Foo (int x, int y) {
 4         this.x = x;
 5         this.y = y;
 6     }
 7     
 8     public static void switcheroo (Foo a, Foo b) {
 9         Foo temp = a;
10         a = b;
11         b = temp;
12     }
13     
14     public static void fliperoo (Foo a, Foo b) {
15         Foo temp = new Foo(a.x, a.y);
16         a.x = b.x;
17         a.y = b.y;
18         b.x = temp.x;
19         b.y = temp.y;
20     }
21     
22     public static void swaperoo (Foo a, Foo b) {
23         Foo temp = a;
24         a.x = b.x;
25         a.y = b.y;
26         b.x = temp.x;
27         b.y = temp.y;
28     }
29     
30     public static void main (String[] args) {
31         Foo foobar = new Foo(10, 20);
32         Foo baz = new Foo(30, 40);
33         switcheroo(foobar, baz); //foobar.x: ___ foobar.y: ___ baz.x: ___ baz.y: ___
34         fliperoo(foobar, baz); //foobar.x: ___ foobar.y: ___ baz.x: ___ baz.y: ___
35         swaperoo(foobar, baz); //foobar.x: ___ foobar.y: ___ baz.x: ___ baz.y: ___
36         System.out.println();
37     }
38   }