Java obtains the Class object through the reflection mechanism

Java reflection mechanism: four methods for getting Class objects

1 package com. ljq. test;
2
3 import java. lang. reflect. Field;
4 import java. util. Currency;
5
6 /**
7 * four Java reflection methods for getting Class objects
8 *
9 * @ author jiqinlin
10 *
11 */
12 public class GetClassTest {
13 public static void main (String [] args ){
14 new GetClassTest (). checkClass ();
15}
16
17 public boolean checkClass (){
18 try {
19 System. out. println ("1. Get the object through the class itself ");
20 Class clazz = this. getClass ();
21 System. out. println (clazz. getName ());
22 System. out. println ("================= ");
23
24 System. out. println ("2. Obtain the parent class object through the subclass instance ");
25 Customer customer = new Customer ();
26 clazz = customer. getClass ();
27 System. out. println (clazz. getSuperclass (). getName ());
28 System. out. println ("================= ");
29
30 System. out. println ("3. Get the object through class name. class ");
31 Class forClass = com. ljq. test. GetClassTest. class;
32 System. out. println (forClass. getName ());
33 System. out. println ("================= ");
34
35 System. out. println ("4. Get the object through the class name string ");
36 Class forName = Class. forName ("com. ljq. test. GetClassTest ");
37 System. out. println (forName. getName ());
38 System. out. println ("=============== ");
39
40} catch (Exception e ){
41 return false;
42}
43 return true;
44}
45}

Customer class

 1 package com.ljq.test;
 2 
 3  public class Customer {
 4     private Long id;
 5     private String name;
 6     private int age;
 7 
 8     public Customer() {
 9     }
10 
11     public Customer(String name, int age) {
12         this.name = name;
13         this.age = age;
14     }
15 
16     public Long getId() {
17         return id;
18     }
19 
20     public void setId(Long id) {
21         this.id = id;
22     }
23 
24     public String getName() {
25         return name;
26     }
27 
28     public void setName(String name) {
29         this.name = name;
30     }
31 
32     public int getAge() {
33         return age;
34     }
35 
36     public void setAge(int age) {
37         this.age = age;
38     }
39 }