return、finally

1.try和catch中有return时，finally先执行

 1 public class tryDemo {
 2     public static int show() {
 3         try {
 4             return 1;
 5         }finally{
 6             System.out.println("finally模块被执行");
 7         }
 8     }
 9     public static void main(String args[]) {
10         System.out.println(show());
11     }
12 }
13 ----------
14 finally模块被执行
15 1

public class tryDemo {
    public static int show() {
        try {
            int a = 8/0;
            return 1;
        }catch (Exception e) {
            return 2;
        }finally{
            System.out.println("finally模块被执行");
        }
    }
    public static void main(String args[]) {
        System.out.println(show());
    }
}
------------
finally模块被执行
2

2.如果finally也有return，直接return

 1 public class tryDemo {
 2     public static int show() {
 3         try {
 4             int a = 8/0;
 5             return 1;
 6         }catch (Exception e) {
 7             return 2;
 8         }finally{
 9             System.out.println("finally模块被执行");
10             return 0;
11         }
12     }
13     public static void main(String args[]) {
14         System.out.println(show());
15     }
16 }
17 -------------
18 finally模块被执行
19 0

3.finally中对于返回变量做的改变->会影响最终的返回结果

 1 public class Test {
 2     public Object show1() {
 3         Peo obj = new Peo();
 4         obj.setName("1");
 5         try {
 6             System.out.println(obj);
 7             return obj;
 8         } finally {
 9             System.out.println("finally模块被执行");
10             obj.setName("2");
11         }
12     }
13 
14     public Object show2() {
15         Peo obj = new Peo();
16         obj.setName("1");
17         try {
18             System.out.println(obj);
19             return obj;
20         } finally {
21             System.out.println("finally模块被执行");
22             obj = null;
23         }
24     }
25 
26     public Object show3() {
27         Peo obj = new Peo();
28         obj.setName("1");
29         try {
30             System.out.println(obj);
31             return obj;
32         } finally {
33             System.out.println("finally模块被执行");
34             obj = null;
35             return obj;
36         }
37     }
38 
39     public static void main(String args[]) {
40         Test test = new Test();
41         System.out.println(test.show1());
42         System.out.println("*************");
43         System.out.println(test.show2());
44         System.out.println("*************");
45         System.out.println(test.show3());
46     }
47 
48     class Peo {
49         String name;
50 
51         public void setName(String name) {
52             this.name = name;
53         }
54 
55         @Override
56         public String toString() {
57             return "Peo [name=" + name + "]";
58         }
59     }
60 }
61 --------------------
62 Peo [name=1]
63 finally模块被执行
64 Peo [name=2]
65 *************
66 Peo [name=1]
67 finally模块被执行
68 Peo [name=1]
69 *************
70 Peo [name=1]
71 finally模块被执行
72 null