java中由类名和方法名字符串实现其调用【反射机制】

import java.lang.reflect.Method;

public class Test {
public static void main(String[] args) throws Exception {
String className = "com.runqianapp.ngr.alias.example.FunClass";
String methodName = "sayHello";
Class clz = Class.forName(className);
//
Object obj = clz.newInstance();
//获取方法
Method m = obj.getClass().getDeclaredMethod(methodName, String.class);
//调用方法
String result = (String) m.invoke(obj, "aaaaa");
System.out.println(result);
}
}

class FunClass{
public String sayHello(String s){
System.out.println(s);
return "hello!";
}
}

import java.lang.reflect.InvocationTargetException;

/**

* Created by IntelliJ IDEA.

* File: TestRef.java

* User: Administrator

* Date: 2015-7-10 16:28:44

public class TestRef {
public static void main(String args[]) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
Foo foo = new Foo("这个一个Foo对象！");

Class clazz = foo.getClass();

Method m1 = clazz.getDeclaredMethod("outInfo");

Method m2 = clazz.getDeclaredMethod("setMsg", String.class);

Method m3 = clazz.getDeclaredMethod("getMsg");

m1.invoke(foo);

m2.invoke(foo, "重新设置msg信息！");

String msg = (String) m3.invoke(foo);

System.out.println(msg);

}

class Foo {
private String msg;

public Foo(String msg) {
this.msg = msg;

}

public void setMsg(String msg) {
this.msg = msg;

}

public String getMsg() {
return msg;

}

public void outInfo() {
System.out.println("这是测试Java反射调用无参数方法的测试类");

}

控制台输出结果：这是测试Java反射调用无参数方法的测试类

重新设置msg信息！

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原文链接：https://blog.csdn.net/weixin_39612038/article/details/114132873