Topwo博客-对于Java中反射的方法调用和invoke返回值的理解

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对于Java中反射的方法调用和invoke返回值的理解

发布时间：2021-12-24作者：Topwo来源：原创点击：335

```java
package com.topwo.pack;

public class Person {
    private int age;
    private String name;

public Person(int age, String name) {
        this.age = age;
        this.name = name;
    }

public void setAge(int age) {
        this.age = age;
    }

public int getAge() {
        return age;
    }

public String getName() {
        return name;
    }

public void setName(String name) {
        this.name = name;
    }

public Person() {
    }
    public void send(String halo){
        System.out.println(halo);
    }
    @Override
    public String toString() {
        return "Person{" +
                "age=" + age +
                ", name='" + name + '\'' +
                '}';
    }
}
```

```java
package com.topwo.pack;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class JavaReflectDemo {
    public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException, ClassNotFoundException {
        Class<?> cls = Class.forName("ml.css.pack.Person");
        Object obj = cls.getDeclaredConstructor().newInstance();

Method method = cls.getDeclaredMethod("setName", String.class);
        method.invoke(obj, "张三");

Method method1 = cls.getDeclaredMethod("setAge", int.class);
        method1.invoke(obj, 11);

Method method2 = cls.getDeclaredMethod("getName");
        String name = (String) method2.invoke(obj);
        System.out.println(name);

Method method3 = cls.getDeclaredMethod("getAge");
        int age1 = (int) method3.invoke(obj);

/*
        System.out.println(obj);
        Constructor<?> constructor = cls.getConstructor(int.class, String.class);
        Object obj = constructor.newInstance(16,"hello");
        System.out.println(obj);
        {
            Method[] method = cls.getMethods();
            for (Method a:method) {
                System.out.println(a);
            }
        }
        System.out.println("------------------------------------------------------------------------------------------");
        {
            Method[] method = cls.getDeclaredMethods();
            for (Method a:method) {
                System.out.println(a.getName());
            }
        }
        */
    }
```

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