Class.forName的使用

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