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

 /***

  * This Class is for Student bean

  * @author Young

  *

  */

 public class Student {

     private int stud_Id;

     private String stud_Name;

     private String sex;

     private String birthday;

     private String score;

     public int getStud_Id() {

         return stud_Id;

     }

     public void setStud_Id(int stud_Id) {

         this.stud_Id = stud_Id;

     }

     public String getStud_Name() {

         return stud_Name;

     }

     public void setStud_Name(String stud_Name) {

         this.stud_Name = stud_Name;

     }

     public String getSex() {

         return sex;

     }

     public void setSex(String sex) {

         this.sex = sex;

     }

     public String getBirthday() {

         return birthday;

     }

     public void setBirthday(String birthday) {

         this.birthday = birthday;

     }

     public String getScore() {

         return score;

     }

     public void setScore(String score) {

         this.score = score;

     }

     /**

      * This method is a constructor

      *

      * @author Young

      * @param id

      * @param name

      * @param sex

      * @param birthday

      * @param score

      */

     public Student(int id, String name, String sex, String birthday,

             String score) {

         this.stud_Id = id;

         this.stud_Name = name;

         this.sex = sex;

         this.birthday = birthday;

         this.score = score;

     }

     public Student() {

         this.stud_Id = 1000200;

         this.stud_Name = "Test";

         this.sex = "Male";

         this.birthday = "2015/01/28";

         this.score ="3.3";

     }

 }

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