[Java] – 通過反射調用對象的方法

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 TestRef.java

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

/** 
* Created by IntelliJ IDEA. 
* File: TestRef.java 
* User: String 
* Date: 2010-3-29 14:48:44 
*/ 
public class TestRef { 

public static void main(String args[]) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException { 
        Foo foo = new Foo("這個一個Foo對象！"); 
        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, "重新設定msg資訊！"); 
        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("這是測試Java反射的測試類別"); 
    } 
}

 

 

控制台輸出結果：

這是測試Java反射的測試類別 
重新設定msg資訊！ 

Process finished with exit code 0