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 constructor56      * 57      * @author Young58      * @param id59      * @param name60      * @param sex61      * @param birthday62      * @param score63      */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 }

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