反射（承接上面的泛型注解与反射）-优快云博客

本文深入探讨了Java中反射的应用，通过实例演示了如何使用反射获取类的私有属性和泛型参数类型。首先，介绍了User类的定义及其属性访问方法。接着，通过DemoMain4类展示了如何利用反射获取User类的name属性值，以及如何获取MyClass泛型类的类型参数信息。

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User.java

package com.inspur.demo3;

public class User {
    private String name;
    private String sex;
    private int age;
    public String getName() {
        return name;
    }
    public User() {
        // TODO Auto-generated constructor stub
    }
    public User(String name){
        this.name=name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    @Override
    public String toString(){
        return this.name+","+this.sex+","+this.age;
        
    }

}

2.获取私有属性

MyClass.java

package com.inspur.demo4;

public class MyClass<A extends Integer,B,C>  {

}

DemoMain4.java

package com.inspur.demo4;

import java.lang.reflect.Field;
import java.util.Arrays;

import com.inspur.demo3.User;

public class DemoMain4 {

    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        
        
        try {
            /*Class c = User.class;
            Field f = c.getDeclaredField("name");
            System.out.println(f.getName());
            System.out.println(f.get(new User("xiaohei")));*/
            Class c1 = MyClass.class;
            System.out.println(c1.getTypeParameters().length);
            System.out.println(c1.getTypeParameters()[0].getName());
            System.out.println(c1.getTypeParameters()[0].getBounds()[0]);
            
            
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } /*catch (NoSuchFieldException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } */catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } /*catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }*/

    }

}