java 利用反射动态调用自身方法及父类方法实例

demo类：

反射工具类：ReflectionUtil.java
父类：Animal.java
子类1：Dog.java
子类2：Cat.java
测试启动类：Test.java

测试代码：

反射工具类：ReflectionUtil.java：

package cn.ckk.reflect;

import java.lang.reflect.Method;

/**
 * @author Administrator
 */
public class ReflectionUtil {

    /**
     * 反射调用指定方法
     * @param owner     类的实例
     * @param methodName    方法名
     * @param argsClass     参数类型
     * @param args          参数
     * @return
     * @throws Exception
     */
    public static Object invokeMethod(Object owner, String methodName, Class[] argsClass, Object[] args) throws Exception{
        Class ownerClass = owner.getClass();
        // 如果调用父类的方法，则父类中的方法必须声明为public
        Method method = ownerClass.getMethod(methodName, argsClass);
        Object objRtn = method.invoke(owner, args);
        return objRtn;
    }

}

父类：Animal.java：

package cn.ckk.reflect;

public class Animal {

    private String name;

    protected void introduceHimself(String name) throws Exception {
        this.name = name;

//        Class[] argsClass = new Class[]{String.class};
//        Object[] args = new Object[]{name};
        Class[] argsClass = new Class[0];
        Object[] args = new Object[0];
        ReflectionUtil.invokeMethod(this, "eat", argsClass, args);
        ReflectionUtil.invokeMethod(this, "eatWhat", argsClass, args);
        ReflectionUtil.invokeMethod(this, "makeSound", argsClass, args);
    }

    public void eat(){
        System.out.println("Hi, I'm "+ this.name + ", I'm hungry now, I need something to eat！");
    }

    public void eatWhat(){
        System.out.println("eat something...?");
    }



}

子类1：Dog.java：

package cn.ckk.reflect;

import org.springframework.stereotype.Component;

@Component
public class Dog extends Animal {

    @Override
    public void eatWhat(){
        System.out.println("I'm a dog, I like eating meat!");
    }

    public void makeSound(){
        System.out.println("I'm a dog, so I can bark!");
    }
}

子类2：Cat.java：

package cn.ckk.reflect;

import org.springframework.stereotype.Component;

@Component
public class Cat extends Animal {

    @Override
    public void eatWhat(){
        System.out.println("I'm a cat, I like eating fish!");
    }

    public void makeSound(){
        System.out.println("I'm a cat, so I can meow meow!");
    }

}

测试启动类：Test.java：

package cn.ckk.reflect;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

@Component
public class Test implements CommandLineRunner {

    @Autowired
    private Dog dog;

    @Autowired
    private Cat cat;

    @Override
    public void run(String... args) throws Exception {
        dog.introduceHimself("汪老大");
        cat.introduceHimself("喵老二");
    }
}

测试启动类结果：

Hi, I'm 汪老大, I'm hungry now, I need something to eat！
I'm a dog, I like eating meat!
I'm a dog, so I can bark!
Hi, I'm 喵老二, I'm hungry now, I need something to eat！
I'm a cat, I like eating fish!
I'm a cat, so I can meow meow!