如何在不同的类中访问此关键字

Question

尝试使用 Java 编程在不同的类中访问此关键字时遇到问题。 我已经尝试过 Context, class.this 但还没有帮助......

我已经使用 NetBeans gui 构建器创建了一个项目，我希望当我单击表单按钮时进行处理...

主类包含用于处理 JFrame 表单 BestQSystems.java 的单击事件：

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
          CloseWindow.closeWindow(); 

   }  

关闭 JFrame 的类：CloseWindow.java

import java.awt.Toolkit;
import java.awt.event.WindowEvent;
import javax.naming.Context;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Benson
 */
public class CloseWindow {
    public  static void closeWindow(){
        WindowEvent widnowEvent = new WindowEvent(this, WindowEvent.WINDOW_CLOSING);
        Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(widnowEvent);
    }
}

在这一行中出现错误WindowEvent widnowEvent = new WindowEvent(this, WindowEvent.WINDOW_CLOSING); 请告诉我如何在不同的类中访问this关键字。

Answer 1

您可以将this的引用传递给其他方法。 例如：

最佳QSystems.java

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
      CloseWindow.closeWindow(this); 
}

并在 CloseWindow.java

public class CloseWindow {
    public  static void closeWindow(BestQSystems ref){
        WindowEvent widnowEvent = new WindowEvent(ref, WindowEvent.WINDOW_CLOSING);
    }
}