变量的比较

 1 class XDog{
 2     private int size;
 3     private String name;
 4     XDog(String name,int size){
 5         this.name = name;
 6         this.size = size;
 7     }
 8     XDog dog1 = new XDog("旺财",100);
 9     XDog dog2 = new XDog("大王",100);
10     public void bark(){
11         if(dog1.equals(dog2)){
12             System.out.println("dog1与dog2意义相等");
13         }
14     }
15     //dog1.equals(dog2)true;
16     
17     
18 }
19 public class Bianliangbijiao {
20     public static void main(String[]  args){    
21           int a = 3;
22           byte b = 3;
23           if(a == b){
24               System.out.println("a与b相等");}
25           
26           
27           
28           
29           Bianliangbijiao foo1 = new Bianliangbijiao();
30           Bianliangbijiao foo2 = new Bianliangbijiao();
31           Bianliangbijiao foo3 =foo1;
32           
33           if(foo1 == foo2){
34               System.out.println("foo1和foo2是指向同一个对象的！");
35           }else{
36               System.out.println("foo1和foo2是指向不同的对象");
37           }
38           
39           if(foo1.equals(foo2)){
40               System.out.println("foo1和foo2是真的相同！");
41           }else{
42               System.out.println("foo1和foo2是真的不相同");
43           }
44           if(foo1 == foo3){
45               System.out.println("foo1和foo3是指向同一个对象的！");
46           }else{
47               System.out.println("foo1和foo3是指向不同的对象");
48           }
49       }
50 }