Java 在运行时更改方法的行为？

我有以下代码

头等舱

package com.test;

public class CustomizeHere
{    
private CustomizeMe customizeMe = new CustomizeMe();    
public void setDescription()
{
    customizeMe.setText("How about calling some method before me?");
}    
}

package com.test;

public final class CustomizeMe
{
private String text = null;    
public String getText()
{
    return text;
}

public void setText(String text)
{
    this.text = text;
}    
}

package com.test;

public class ReflectCustomizer
{    
/**
 * @param args
 */
public static void main(String[] args)
{
    CustomizeHere customizeHere = new CustomizeHere();
    // Requirement here is when customizeMe.setText() before method invocation we want to add some additional behaviour at run time like we should come to
    // know setText() is invoked.
    customizeHere.setDescription();        
}    
}

二等舱

package com.test;

public class CustomizeHere
{    
private CustomizeMe customizeMe = new CustomizeMe();    
public void setDescription()
{
    customizeMe.setText("How about calling some method before me?");
}    
}

package com.test;

public final class CustomizeMe
{
private String text = null;    
public String getText()
{
    return text;
}

public void setText(String text)
{
    this.text = text;
}    
}

package com.test;

public class ReflectCustomizer
{    
/**
 * @param args
 */
public static void main(String[] args)
{
    CustomizeHere customizeHere = new CustomizeHere();
    // Requirement here is when customizeMe.setText() before method invocation we want to add some additional behaviour at run time like we should come to
    // know setText() is invoked.
    customizeHere.setDescription();        
}    
}

三等舱

package com.test;

public class CustomizeHere
{    
private CustomizeMe customizeMe = new CustomizeMe();    
public void setDescription()
{
    customizeMe.setText("How about calling some method before me?");
}    
}

package com.test;

public final class CustomizeMe
{
private String text = null;    
public String getText()
{
    return text;
}

public void setText(String text)
{
    this.text = text;
}    
}

package com.test;

public class ReflectCustomizer
{    
/**
 * @param args
 */
public static void main(String[] args)
{
    CustomizeHere customizeHere = new CustomizeHere();
    // Requirement here is when customizeMe.setText() before method invocation we want to add some additional behaviour at run time like we should come to
    // know setText() is invoked.
    customizeHere.setDescription();        
}    
}

我想知道在上面的场景中，我是否可以知道正在调用

CustomizeMe

上的

setText（）

方法？我不能从customizeMe更改代码，但我在运行时使用反射创建了customizeMe的实例

---

我不能在

CustomizeMe

和

CustomizeHere

类中更改代码。另外，正如

java.lang.Reflect.Method

类不允许附加任何listner，以便我知道它正在被调用，那么还有其他方法吗？

一种高级方法是定义一个面向setText方法的方面，该方法包含您想要编写的附加逻辑。这将在该方面所针对的类的任何实例上运行该方法的所有调用

---

Aspect旨在解决横切问题。

如果您的需求是在调用其他方法之前设置对象上的一些参数，那么您可以让构造函数获取这些参数，或者，如果要创建的各种配置选项之间存在相互依赖关系，则遵循生成器模式。

您到底想要什么。。？您正在调用customizeHere.setDescription（）；这就是callcustomizeme.setText（“在我之前调用某个方法怎么样？”）；因此，调用了end setText（）|