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java - 尽管编译了运行器文件，但 GUI 不会出现

问题描述

我的作业要求我们编写一个由原始项目文件打开的“运行程序”文件，并且只有在运行项目文件时，我的运行程序文件才不会创建 GUI，否则运行运行程序文件本身会创建。

老师包含了我没有包含我的事件处理代码的反馈，但我不确定我此时缺少什么。

这是我不干预的程序：

  public static void main(String[] args){
    new Proj05Runner();
  }//end main
}//end class Proj05

这是我的跑步者代码：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Proj05Runner extends JFrame{
    public static void main(String[] args){
        GUI gui = new GUI();
    }
}

class GUI extends JFrame{
    public GUI(){//constructor
    //Create a new Frame object
    JFrame displayWindow = new JFrame();
    displayWindow.setSize(300,200);
    displayWindow.setTitle("Brendan");
    //Button button1 = new Button("Press");
    //Instantiate two Listener objects that will process
    // Window events
    WProc1 winProcCmd1 = new WProc1(displayWindow);
    WProc2 winProcCmd2 = new WProc2();

    //Register the Listener objects for notification of
    // Window events. This object is the Event Source.
    displayWindow.addWindowListener(winProcCmd1);
    displayWindow.addWindowListener(winProcCmd2);

    //windowActivated and windowOpened test messages
    // are produced here
    displayWindow.setVisible(true);
    }
}

class WProc1 implements WindowListener{
  //used to save a reference to the Frame object
  JFrame displayWindowRef;

  WProc1(JFrame windowIn){//constructor
    // save ref to JFrame object
    this.displayWindowRef = windowIn;
  }//end constructor

  public void windowClosed(WindowEvent e){
    System.out.println("WProc1 windowClosed test msg");
  }//end windowClosed()

  public void windowIconified(WindowEvent e){
    System.out.println("WProc1 windowIconified test msg");
  }//end windowIconified()

  public void windowOpened(WindowEvent e){
    System.out.println("WProc1 windowOpened test msg");
  }//end windowOpened()

  public void windowClosing(WindowEvent e){
    System.out.println("WProc1 windowClosing test msg");
    displayWindowRef.dispose();//generate WindowClosed
  }//end windowClosing()

  public void windowDeiconified(WindowEvent e){
    System.out.println(
                      "WProc1 windowDeiconified test msg");
  }//end windowDeiconified()

  public void windowActivated(WindowEvent e){
    System.out.println("WProc1 windowActivated test msg");
  }//end windowActivated()

  public void windowDeactivated(WindowEvent e){
    System.out.println(
                     "WProc1 windowDeactivated test msg");
  }//end windowDeactivated()
}//end class WProc1
//=======================================================//

//This and the previous class can be used to instantiate
// Listener objects. Note that this class extends an
// Adapter class that can be used to avoid the
// requirement to define all of the methods of the
// actual Listener class named WindowListener. This class
// overrides only two of the methods declared in the
// interface.  It displays a message whenever one of the
// methods is called.
class WProc2 extends WindowAdapter{

  public void windowIconified(WindowEvent e){
    System.out.println(
              "******** WProc2 windowIconified test msg");
  }//end windowIconified()

  public void windowDeiconified(WindowEvent e){
    System.out.println(
            "******** WProc2 windowDeiconified test msg");
  }//end windowDeiconified()

}//end class WProc2

提前感谢您的帮助

标签： javauser-interface

解决方案

Proj05Runner 有一个静态的 main 方法，没有构造函数，但是当你调用时，你调用new Proj05Runner();的不是那个 main 方法，而是一个默认的构造函数。

您必须找到可能的解决方案，Proj05Runner.main(args);通过空构造函数更改该行或更改 Proj05Runner 主方法：

public Proj05Runner(){
    GUI gui = new GUI();
}

顺便说一句，如果您使用的是 JDK10 或更高版本，则可以使用 var 关键字：var gui = new GUI();

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