System.out.println(对象)

 1 class Person {
 2     private String name;
 3     private int age;
 4     public String getName() {
 5         return this.name;
 6     }
 7
 8     public void setName(String name) {
 9         this.name = name;
10     }
11
12     public int getAge() {
13         return this.age;
14     }
15
16     public void setAge(int age) {
17         this.age = age;
18     }
19
20     public int getAge() {
21         return this.age;
22     }
23
24     public String toString() {
25         return "姓名: " + this.name + ", 年龄: " + this.age;
26     }
27 }
28
29 public class InstanceDemo01 {
30     public static void main(String args[]) {
31         Class<?> c = null;
32         try {
33             c = Class.forName("Person");
34         } catch(ClassNotFoundException e) {
35             e.printStackTrace();
36         }
37
38         Person per = null;
39         try {
40             per = (Person)c.newInstance();    // 实例化Person对象
41         } catch(Exception e) {
42             e.printStackTrace();
43         }
44
45         per.setName("李兴华");
46         per.setAge(30);
47         System.out.println(per);            // 内容输出: 调用toString()
48     }
49 }