System. Out. println (object)

 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 }

 

System.out.println(对象)