获取类的方法

获取方法的方法

public class Users {
    private String username;
    private int userage;
    public int heigh;
    private int getHeigh() {
        return heigh;
    }
    private void setHeigh(int heigh) {
        this.heigh = heigh;
    }
    public Users(){
    }
    public Users(String username,int userage){
        this.userage=userage;
        this.username=username;
    }
    private Users(int userage){
        this.userage=userage;
    }
    public Users(String username){
        this.username=username;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public int getUserage() {
        return userage;
    }
    public void setUserage(int userage) {
        this.userage = userage;
    }
}

如何获取类的方法

import java.lang.reflect.Method;
public class GetMethod {
    public static void main(String[] args) throws Exception {
        Class clazz = Users.class;
        Method[] methods=clazz.getDeclaredMethods(); //获取所有方法，包括pribate类型方法
        for(Method m:methods){
            System.out.println(m);
            System.out.println(m.getName());
        }
        System.out.println("-------------------");
        Method[] methods1=clazz.getMethods(); //获取所有方法，不包括private方法
        for(Method m:methods1){
            System.out.println(m);
            System.out.println(m.getName());
        }
        System.out.println("---------------------");
        Method method=clazz.getDeclaredMethod("setHeigh", int.class);
        System.out.println(method.getName());
        System.out.println("---------------------------");
        Method method1 = clazz.getMethod("setUserage", int.class);
        System.out.println(method1.getName());
    }
}

获取后调用方法

import java.lang.reflect.Method;
public class GetMethod2 {
    public static void main(String[] args) throws Exception {
        Class clazz = Users.class;
        Method method = clazz.getMethod("setUserage", int.class);
        //实例化对象
        Object obj = clazz.newInstance();
        //通过setUserage赋值
        method.invoke(obj,66);
        //通过getUserage获取值
        Method method1 =clazz.getMethod("getUserage");
        Object value = method1.invoke(obj);
        System.out.println(value);
    }
}