Class.forName的使用

Class.forName返回一个类，使用此方法可以获取类

首先，创建一个Student类

 1 /***
 2  * This Class is for Student bean
 3  * @author Young
 4  *
 5  */
 6 public class Student {
 7 
 8     private int stud_Id;
 9     private String stud_Name;
10     private String sex;
11     private String birthday;
12     private String score;
13 
14     public int getStud_Id() {
15         return stud_Id;
16     }
17 
18     public void setStud_Id(int stud_Id) {
19         this.stud_Id = stud_Id;
20     }
21 
22     public String getStud_Name() {
23         return stud_Name;
24     }
25 
26     public void setStud_Name(String stud_Name) {
27         this.stud_Name = stud_Name;
28     }
29 
30     public String getSex() {
31         return sex;
32     }
33 
34     public void setSex(String sex) {
35         this.sex = sex;
36     }
37 
38     public String getBirthday() {
39         return birthday;
40     }
41 
42     public void setBirthday(String birthday) {
43         this.birthday = birthday;
44     }
45 
46     public String getScore() {
47         return score;
48     }
49 
50     public void setScore(String score) {
51         this.score = score;
52     }
53 
54     /**
55      * This method is a constructor
56      * 
57      * @author Young
58      * @param id
59      * @param name
60      * @param sex
61      * @param birthday
62      * @param score
63      */
64     public Student(int id, String name, String sex, String birthday,
65             String score) {
66 
67         this.stud_Id = id;
68         this.stud_Name = name;
69         this.sex = sex;
70         this.birthday = birthday;
71         this.score = score;
72     }
73     
74     public Student() {
75 
76         this.stud_Id = 1000200;
77         this.stud_Name = "Test";
78         this.sex = "Male";
79         this.birthday = "2015/01/28";
80         this.score ="3.3";
81     }
82 }

View Code

然后使用该类

Class<?> c = Class.forName(Student.class.getCanonicalName());
        Object obj=c.newInstance();
        for(Method m:c.getMethods())
        {
            System.out.println(m.getName());
            if(m.getName().equals("getId"))
            {
                System.out.println(m.invoke(obj));
            }

使用invoke运行该类的方法

使用getInstance方法获取一个对象

获取不带参数的对象，如果遇到带参数的对象该怎么获取？

        Class<?> c = Class.forName(Student.class.getCanonicalName());
        Constructor<?> constructor = c.getConstructor(Integer.TYPE,
                String.class, String.class, String.class, String.class);
        Object obj = constructor.newInstance(1, "Test", "Male", "2015-07-09",
                "80");
        for (Method m : c.getMethods()) {
            System.out.println(m.getName());
            if (m.getName().equals("getSex")) {
                System.out.println(m.invoke(obj));
            }
        }

使用Constructor ，可以设置参数