Question

java 反射机制的几个调用方法

Answer 1

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

/**
* Created by IntelliJ IDEA.
* File: TestRef.java
* User: leizhimin
* Date: 2008-1-28 14:48:44
*/
public class TestRef {

public staticvoid 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反射的测试类");
}
}