Java JPopupMenu setVisible(false);

Question

当我尝试创建 JPopupMenu 或实际上尝试摆脱 JPopupMenu 时，我对代码行有所了解。我一直在寻找解决方案，所有解决方案都使用 Component.setVisible(false) 或 .setVisible(true);

但就我而言，无论我尝试什么，我都无法工作。总而言之，我的应用程序。正在工作，我将使用 System.out.println("工作正常或其他什么!");所以我知道语句已经改变，循环已经执行，ActionListener/Itemlistener 等正在工作。基本上我已经使用“CreateGUI”创建了一个主窗口，通过 main([String[] args) 调用，有一个框架类，然后放入面板和 Pane 来控制布局。在我的框架中，有一个 JButton“vHent”，它正在调用 PopKalender()，然后我的 JPopupMenu 显示在屏幕上。在 JPopupMenu“popUpKalenderWindow”中，我有一个 JButton“kill”、“OK”(未使用)和一个 MenuItem(“vMenu Tryk Her”)。

我的想法是，即从 MenuItems 中读出一些状态，此时 JButton“kill” 用于关闭 JPopupMenu。但正如所说，似乎没有什么可以关闭弹出菜单!但其他一切都按其预期工作，当使用 System.out.println() 检查时，我会读出显示循环、构造函数调用、按钮/菜单项等正在按预期工作。我尝试直接在我的 ActionPerformedListener 和 PopKalender() 下放入: popUpKalenderWindow.setVisible(false) ，尝试在 popKalender(true/false) 中强制转换参数 true/false，然后创建一个 if 语句(如您所见)现在)无论如何它都行不通。

(使用Eclipse，所以代码行被直接复制过来。一些评论是丹麦语的(我很抱歉)，但是需要的行是英语的。还有一些评论是为了让我了解该行的内容和原因是这样写的!是的，CheckBox 应该位于 ArrayList 中并使用 for(){} 完成，所以这是新手解决方案! )。

那么有人可以在这里帮助我并告诉我为什么当按下“kill”按钮时 PopKalender() 不会消失吗？

//package components;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.ComponentOrientation;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import javax.swing.AbstractButton;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JTextField;

public class Frame extends JPanel implements ItemListener, ActionListener {
private static final long _1L = 1L;
/**
 * 
 */

        // Klargør CheckBoxes
        JCheckBox tal1;
        JCheckBox tal2;
        JCheckBox tal3;
        JCheckBox tal4;
        JCheckBox tal5;
        JCheckBox tal6;
        JCheckBox tal7;
        JCheckBox tal8;
        JCheckBox tal9;
        JCheckBox tal10;
        JCheckBox tal11;
        JCheckBox tal12;
        JCheckBox tal13;
        JCheckBox tal14;
        JCheckBox tal15;
        JCheckBox tal16;
        JCheckBox tal17;
        JCheckBox tal18;
        JCheckBox tal19;
        JCheckBox tal20;
        JCheckBox tal21;
        JCheckBox tal22;
        JCheckBox tal23;
        JCheckBox tal24;
        JCheckBox tal25;
        JCheckBox tal26;
        JCheckBox tal27;
        JCheckBox tal28;
        JCheckBox tal29;
        JCheckBox tal30;
        JCheckBox tal31;
        JCheckBox tal32;
        JCheckBox tal33;
        JCheckBox tal34;
        JCheckBox tal35;
        JCheckBox tal36;

        //Klargør ArrayList til valgte tal
        ArrayList<Integer> valg = new ArrayList<Integer>();

        //Klargør knapper 
        JButton vOk;    //til valgte tal Tekst: Tilføj

        JButton vHent;  //til at hente uge / kalender for valg af uge
        JButton bRegn;  //til at beregne ugen tal

        //Klargør Tekster 
        JLabel labelValg = new JLabel("Du har valgt: ");    //til valgte tal
        JLabel labelTidNu = new JLabel("år-uge-dag-kl");        //til nuværende tid
        JLabel labelValgTid = new JLabel("år-uge der skal skrives til");    //til valgte uge/år, der skal tilføjes Talvalg
        JLabel labelUd_1 = new JLabel("  1: ");     //til udlæsning af Talforslag LabelUd_1 - LabelUd_10
        JLabel labelUd_2 = new JLabel("  2: ");
        JLabel labelUd_3 = new JLabel("  3: ");
        JLabel labelUd_4 = new JLabel("  4: ");
        JLabel labelUd_5 = new JLabel("  5: ");
        JLabel labelUd_6 = new JLabel("  6: ");
        JLabel labelUd_7 = new JLabel("  7: ");
        JLabel labelUd_8 = new JLabel("  8: ");
        JLabel labelUd_9 = new JLabel("  9: ");
        JLabel labelUd_10 = new JLabel("10: ");



public Frame(){
    super(new BorderLayout());

    //Opret Paneler til under paneler
    //Opret Top, left, center, right, buttom Panel
    JPanel topPanel = new JPanel(); //Indsæt BorderLayout efter opstilling !
    JPanel leftPanel = new JPanel();
    JPanel centerPanel = new JPanel();
    JPanel rightPanel = new JPanel();
    JPanel bottomPanel = new JPanel();

    //Set internt Layout for top, left, right panel
    topPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
    leftPanel.setLayout(new GridLayout(4, 0));
    rightPanel.setLayout(new GridLayout(2, 0));

    //Set størrelse på paneler
    topPanel.setPreferredSize(new Dimension(900, 50));
    leftPanel.setPreferredSize(new Dimension(300, 500));
    centerPanel.setPreferredSize(new Dimension(300, 500));
    rightPanel.setPreferredSize(new Dimension(300, 500));
    bottomPanel.setPreferredSize(new Dimension(900, 50));

    //tilføj paneler til frame'en og placer dem i layout'et
    add(topPanel, BorderLayout.PAGE_START);
    add(leftPanel, BorderLayout.LINE_START);
    add(centerPanel, BorderLayout.CENTER);
    add(rightPanel, BorderLayout.LINE_END);
    add(bottomPanel, BorderLayout.PAGE_END);


    //Opret Checkboxes
    tal1 = new JCheckBox("1");
    tal2 = new JCheckBox("2");
    tal3 = new JCheckBox("3");
    tal4 = new JCheckBox("4");
    tal5 = new JCheckBox("5");
    tal6 = new JCheckBox("6");
    tal7 = new JCheckBox("7");
    tal8 = new JCheckBox("8");
    tal9 = new JCheckBox("9");
    tal10 = new JCheckBox("10");
    tal11 = new JCheckBox("11");
    tal12 = new JCheckBox("12");
    tal13 = new JCheckBox("13");
    tal14 = new JCheckBox("14");
    tal15 = new JCheckBox("15");
    tal16 = new JCheckBox("16");
    tal17 = new JCheckBox("17");
    tal18 = new JCheckBox("18");
    tal19 = new JCheckBox("19");
    tal20 = new JCheckBox("20");
    tal21 = new JCheckBox("21");
    tal22 = new JCheckBox("22");
    tal23 = new JCheckBox("23");
    tal24 = new JCheckBox("24");
    tal25 = new JCheckBox("25");
    tal26 = new JCheckBox("26");
    tal27 = new JCheckBox("27");
    tal28 = new JCheckBox("28");
    tal29 = new JCheckBox("29");
    tal30 = new JCheckBox("30");
    tal31 = new JCheckBox("31");
    tal32 = new JCheckBox("32");
    tal33 = new JCheckBox("33");
    tal34 = new JCheckBox("34");
    tal35 = new JCheckBox("35");
    tal36 = new JCheckBox("36");

    //Set default
    tal1.setSelected(false);
    tal2.setSelected(false);
    tal3.setSelected(false);
    tal4.setSelected(false);
    tal5.setSelected(false);
    tal6.setSelected(false);
    tal7.setSelected(false);
    tal8.setSelected(false);
    tal9.setSelected(false);
    tal10.setSelected(false);
    tal11.setSelected(false);
    tal12.setSelected(false);
    tal13.setSelected(false);
    tal14.setSelected(false);
    tal15.setSelected(false);
    tal16.setSelected(false);
    tal17.setSelected(false);
    tal18.setSelected(false);
    tal19.setSelected(false);
    tal20.setSelected(false);
    tal21.setSelected(false);
    tal22.setSelected(false);
    tal23.setSelected(false);
    tal24.setSelected(false);
    tal25.setSelected(false);
    tal26.setSelected(false);
    tal27.setSelected(false);
    tal28.setSelected(false);
    tal29.setSelected(false);
    tal30.setSelected(false);
    tal31.setSelected(false);
    tal32.setSelected(false);
    tal33.setSelected(false);
    tal34.setSelected(false);
    tal35.setSelected(false);
    tal36.setSelected(false);

    //opret en ItemListener for Checkboxes
    tal1.addItemListener(this);
    tal2.addItemListener(this);
    tal3.addItemListener(this);
    tal4.addItemListener(this);
    tal5.addItemListener(this);
    tal6.addItemListener(this);
    tal7.addItemListener(this);
    tal8.addItemListener(this);
    tal9.addItemListener(this);
    tal10.addItemListener(this);
    tal11.addItemListener(this);
    tal12.addItemListener(this);
    tal13.addItemListener(this);
    tal14.addItemListener(this);
    tal15.addItemListener(this);
    tal16.addItemListener(this);
    tal17.addItemListener(this);
    tal18.addItemListener(this);
    tal19.addItemListener(this);
    tal20.addItemListener(this);
    tal21.addItemListener(this);
    tal22.addItemListener(this);
    tal23.addItemListener(this);
    tal24.addItemListener(this);
    tal25.addItemListener(this);
    tal26.addItemListener(this);
    tal27.addItemListener(this);
    tal28.addItemListener(this);
    tal29.addItemListener(this);
    tal30.addItemListener(this);
    tal31.addItemListener(this);
    tal32.addItemListener(this);
    tal33.addItemListener(this);
    tal34.addItemListener(this);
    tal35.addItemListener(this);
    tal36.addItemListener(this);

    //Sæt CheckBoxes i 6 kolonner i et Panel
    JPanel checkPanel = new JPanel(new GridLayout(0, 6));
    checkPanel.add(tal1);
    checkPanel.add(tal2);
    checkPanel.add(tal3);
    checkPanel.add(tal4);
    checkPanel.add(tal5);
    checkPanel.add(tal5);
    checkPanel.add(tal6);
    checkPanel.add(tal7);
    checkPanel.add(tal8);
    checkPanel.add(tal9);
    checkPanel.add(tal10);
    checkPanel.add(tal11);
    checkPanel.add(tal12);
    checkPanel.add(tal13);
    checkPanel.add(tal14);
    checkPanel.add(tal15);
    checkPanel.add(tal16);
    checkPanel.add(tal17);
    checkPanel.add(tal18);
    checkPanel.add(tal19);
    checkPanel.add(tal20);
    checkPanel.add(tal21);
    checkPanel.add(tal22);
    checkPanel.add(tal23);
    checkPanel.add(tal24);
    checkPanel.add(tal25);
    checkPanel.add(tal26);
    checkPanel.add(tal27);
    checkPanel.add(tal28);
    checkPanel.add(tal29);
    checkPanel.add(tal30);
    checkPanel.add(tal31);
    checkPanel.add(tal32);
    checkPanel.add(tal33);
    checkPanel.add(tal34);
    checkPanel.add(tal35);
    checkPanel.add(tal36);

    //Set checkpanel størrelse og tilføj det til leftPanel med en ramme
    checkPanel.setPreferredSize(new Dimension(290, 290));   
    leftPanel.add(checkPanel);
    setBorder(BorderFactory.createEmptyBorder(20,20,20,20));

    //leftPanel med valgte tal
    leftPanel.add(labelValg);
    labelValg.setPreferredSize(new Dimension(290, 25));

    //Tilføj tekster 
    //topPanel m. nuværende tid     
    topPanel.add(labelTidNu);
    labelTidNu.setPreferredSize(new Dimension(210, 25));
    //Hjælpe funktioner til ur
    Thread t = new Kalender(labelTidNu);    //Bruges til at lave en tråd Thread for Kalender
    t.start();                      //Tråden t startes og kan kontrolleres med Thread.sleep(1000) = pause

    //klargør Knapper til: valgte tal
     vOk = new JButton("Tilføj Tal");
     vOk.setPreferredSize(new Dimension(100, 50));
     vOk.setActionCommand("vOk");   //Set ActionCommand til genkendelse
     vOk.addActionListener(this);   //Tilføj en Action Listener
     //hent uge / kalender
     vHent = new JButton("Hent Uge");
     vHent.setActionCommand("vHent");
     vHent.addActionListener(this);
     vHent.setPreferredSize(new Dimension(100, 50));
     //Beregn ugens tal
     bRegn = new JButton("Beregn");
     bRegn.setActionCommand("bRegn");
     bRegn.addActionListener(this);
     bRegn.setPreferredSize(new Dimension(100, 50));


     //Opret et knap Panel
            JPanel knapPanel = new JPanel();
            knapPanel.setLayout(new BoxLayout(knapPanel, BoxLayout.Y_AXIS));
        //  knapPanel.setPreferredSize(new Dimension(290, 300));

        //opret  layoutpaneler med flowlayoutX til knapper og tekst
            //layoutPanel1
            JPanel layoutPanel1 = new JPanel();
            layoutPanel1.setLayout(new FlowLayout(FlowLayout.LEFT));
            layoutPanel1.setPreferredSize(new Dimension(290, 150));

            //layoutPanel2
            JPanel layoutPanel2 = new JPanel();
            layoutPanel2.setLayout(new FlowLayout(FlowLayout.RIGHT));
            layoutPanel2.setPreferredSize(new Dimension(290, 150));

            //Tilføj knapper / tekster
            layoutPanel1.add(vHent);
            layoutPanel1.add(labelValgTid);
            layoutPanel2.add(vOk);
            knapPanel.add(layoutPanel1);
        //  knapPanel.add(fillPanel1);
            knapPanel.add(layoutPanel2);
            leftPanel.add(knapPanel);
            setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));

            //Opret panel til udlæsning
            JPanel listePanel = new JPanel();
            listePanel.setLayout(new BoxLayout(listePanel, BoxLayout.Y_AXIS));
            listePanel.setPreferredSize(new Dimension(280, 300));

            //Opret Panel til Knap
            JPanel knapPanel2 = new JPanel();
            knapPanel2.setPreferredSize(new Dimension(280, 150));
            knapPanel2.setLayout(new FlowLayout(FlowLayout.RIGHT));

            //Tilføj lister / knap
            listePanel.add(labelUd_1);
            listePanel.add(labelUd_2);
            listePanel.add(labelUd_3);
            listePanel.add(labelUd_4);
            listePanel.add(labelUd_5);
            listePanel.add(labelUd_6);
            listePanel.add(labelUd_7);
            listePanel.add(labelUd_8);
            listePanel.add(labelUd_9);
            listePanel.add(labelUd_10);
            rightPanel.add(listePanel);
            knapPanel2.add(bRegn);
            rightPanel.add(knapPanel2);


} //Frame end

//Lyt til Checkboxes,  send resultatet til Valgtjek og opdater display / LabelValg  
public void itemStateChanged(ItemEvent e){
    //      int index = 0;
    Object kilde = e.getItemSelectable();
    if(kilde == tal1){
        Valgtjek(1);
    }else if(kilde == tal2){
        Valgtjek(2);    
    }else if(kilde == tal3){
        Valgtjek(3);
    }else if(kilde == tal4){
        Valgtjek(4);    
    }else if(kilde == tal5){
        Valgtjek(5);    
    }else if(kilde == tal6){
        Valgtjek(6);    
    }else if(kilde == tal7){
        Valgtjek(7);    
    }else if(kilde == tal8){
        Valgtjek(8);    
    }else if(kilde == tal9){
        Valgtjek(9);    
    }else if(kilde == tal10){
        Valgtjek(10);   
    }else if(kilde == tal11){
        Valgtjek(11);   
    }else if(kilde == tal12){
        Valgtjek(12);   
    }else if(kilde == tal13){
        Valgtjek(13);   
    }else if(kilde == tal14){
        Valgtjek(14);   
    }else if(kilde == tal15){
        Valgtjek(15);   
    }else if(kilde == tal16){
        Valgtjek(16);   
    }else if(kilde == tal17){
        Valgtjek(17);   
    }else if(kilde == tal18){
        Valgtjek(18);   
    }else if(kilde == tal19){
        Valgtjek(19);   
    }else if(kilde == tal20){
        Valgtjek(20);   
    }else if(kilde == tal21){
        Valgtjek(21);   
    }else if(kilde == tal22){
        Valgtjek(22);   
    }else if(kilde == tal23){
        Valgtjek(23);   
    }else if(kilde == tal24){
        Valgtjek(24);   
    }else if(kilde == tal25){
        Valgtjek(25);   
    }else if(kilde == tal26){
        Valgtjek(26);   
    }else if(kilde == tal27){
        Valgtjek(27);   
    }else if(kilde == tal28){
        Valgtjek(28);   
    }else if(kilde == tal29){
        Valgtjek(29);   
    }else if(kilde == tal30){
        Valgtjek(30);   
    }else if(kilde == tal31){
        Valgtjek(31);   
    }else if(kilde == tal32){
        Valgtjek(32);   
    }else if(kilde == tal33){
        Valgtjek(33);   
    }else if(kilde == tal34){
        Valgtjek(34);   
    }else if(kilde == tal35){
        Valgtjek(35);   
    }else if(kilde == tal36){
        Valgtjek(36);   
    }

    //Opdater og udlæs valgte
    String s = valg.toString();
    labelValg.setText("Du har valgt: " +s);   
    }

//Lyt til Knapper   //Button Listener
public void actionPerformed(ActionEvent e){
    Object kilde = e.getActionCommand();
    if(kilde == "vOk"){

        System.out.println("Tillykke vOk er Ramt");
    }else{
        if(kilde == "vHent"){
            PopKalender(true);      //Call PopUpWindow
            System.out.println("Tillykke vHent er ramt");   //This works and "PopKalender" shows on screen
        }else {
            if(kilde == "bRegn"){
                System.out.println("Tillykke der beregnes");
            }
        else{
            if(kilde == "Kill"){
         PopKalender(false);                

                System.out.println("KILL WINDOW");  //This read out works fine, but "PopKalender" dosen't disappear
            //  System.exit( 0 );   //Also work but NOT as intended !!!  :D

            }
        }
    }
} }

//Ur til topPanel
//Der oprettes en klasse
class Kalender extends Thread {
    JLabel labelUrOpdater;
     Kalender(JLabel labelTidNu){
        labelUrOpdater = labelTidNu;    
    }   

    //Opret variabler til nutid år, måned, dag i måned, uge, dag, timer, minutter, sek
    int year;
    int month;
    String monthName;
    int date;
    int dayOfMonth;
    int weekOfYear;
    int dayOfWeek;
    int hour;
    int minute;
    int second;
    String[] måneder = {"Januar", "Februar", "Marts", "April", "Maj", "Juni", "Juli", "August", "September", "Oktober", "November", "December" };

public void run() {
Calendar ur = new GregorianCalendar();
for(;;){
    Date trialTime = new Date();
    ur.setTime(trialTime);
        year = ur.get(Calendar.YEAR);
        month = ur.get(Calendar.MONTH);
        date = ur.get(Calendar.DATE);
        dayOfMonth = ur.get(Calendar.DAY_OF_MONTH);
        weekOfYear = ur.get(Calendar.WEEK_OF_YEAR);
        dayOfWeek = ur.get(Calendar.DAY_OF_WEEK);
        hour = ur.get(Calendar.HOUR_OF_DAY);
        minute = ur.get(Calendar.MINUTE);
        second = ur.get(Calendar.SECOND);   
        monthName = måneder[month];
        //Sæt 0 foran 0-9 i sekunder / minutter
        if((minute <= 9) || (second <= 9)){
            if(minute <= 9){
                labelTidNu.setText( year + ". " + dayOfMonth + " " + monthName + " " + "Uge: " + weekOfYear + "   " + "Kl: "  + hour + ":" + "0" + minute + ":" + second);

        }else{
            if(second <= 9){
            labelTidNu.setText( year + ". " + dayOfMonth + " " + monthName + " " + "Uge: " + weekOfYear + "   " + "Kl: "  + hour + ":" + minute + ":" + "0" + second);
                }

        }
        }
        else{           
            labelTidNu.setText( year + ". " + dayOfMonth + " " + monthName + " " + "Uge: " + weekOfYear + "   " + "Kl: "  + hour + ":" + minute + ":" + second);
        //  labelTidNu.repaint();
            }
    try { Thread.sleep(1000);
    } catch(InterruptedException e){
        System.out.println("Thread Error");
            }
        }
    }   

}

    //Tal Checker: Se om de valgte tal er på listen, fjern eller tilføj. Call fra ItemStateChange
public void Valgtjek(int tjek) {
    boolean v = valg.contains(tjek);
        if(v){
        int i = valg.indexOf(tjek);
        valg.remove(i);
        System.out.println("Fjernede");
    }
    else{
        valg.add(tjek);
        System.out.println("valgte :" + tjek);
        }
}

//ActionListener for PopUpKalender "PopKalender" / ActionListener f. JPopupMenu
class PopKalValg implements ActionListener{
    public void actionPerformed(ActionEvent actionEvent){
        System.out.println("Valgt" + actionEvent.getActionCommand());

    }
}   


//Pop-up til kalender valg (Popup Menu for my Pick Calender
public void PopKalender(boolean pState){
    boolean pTest = false;

    JPopupMenu popUpKalenderWindow = new JPopupMenu();
//  popUpKalenderWindow.setDefaultCloseOperation();
    popUpKalenderWindow.setPreferredSize(new Dimension(400, 400));
    popUpKalenderWindow.setLocation(700, 300);

    ActionListener kalActionValg = new PopKalValg();    //ActionListener to objects inside the JPopupMenu

    JPanel popPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));  //Panel to hold objects and control layout
    JButton dOk = new JButton("OK");    //Not in use, just show

    JMenuItem vMenu = new JMenuItem("vMenu Tryk Her");  //test Item to learn JMenuItem
    vMenu.addActionListener( kalActionValg);
    popPanel.add(vMenu);

    JButton kill = new JButton("kill");     //In Use, supposed to shut down JPopupMenu
    kill.setActionCommand("Kill");
    kill.addActionListener(this);
    popPanel.add(dOk);
    popPanel.add(kill);
    popUpKalenderWindow.add(popPanel);
    if(pTest !=  pState){   
    popUpKalenderWindow.setVisible(true);   //works fine
    pTest = true;
    System.out.println(pTest);  // works fine, state has changed
    }else{
        //      getRootPane().setVisible(false);    //Dosen't work

    //      popPanel.setVisible(false); Dosen't Work
        popUpKalenderWindow.setVisible(false);      // Dosen't work
            System.out.println("Pop set visible false");    //Do work, so loop statement has been reached !!!


    }




}


private static void createAndShowGUI(){
    //Create and set up window
    JFrame frame = new JFrame("Mit Program");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Afslut Runtime ved vindue luk
    frame.setPreferredSize(new Dimension(900, 600));    //Set størrelse på vinduet

    /*      //Create background, put background in ContentPane place it Center
    JLabel bckGnd = new JLabel("");
    frame.getContentPane().add(bckGnd, BorderLayout.CENTER);
*/

    //Opret et Ground Panel til panels
    JComponent groundPanel = new Frame();
    groundPanel.setOpaque(true);            //content Panes skal være opaque
    frame.getContentPane().add(groundPanel);        //Tilføj GroundPanel til frame

    //Display Window
    frame.pack();
    frame.setVisible(true);
}


//SerialVersion ???
private static final long serialVersionUID = _1L;

public static void main(String[] args) {
    // Schedule a job for event-dispatching thread:
    //Creating and showing this Application's GUI.
    javax.swing.SwingUtilities.invokeLater(new Runnable(){      
        public void run(){
            createAndShowGUI();             
        }
    });

}

}

Answer 1

老实说，你的代码很糟糕。无论如何，让您的终止按钮工作的最短方法之一是向其添加一个 ActionListener 并实现在此按钮上执行操作时会发生的情况。

使用以下代码代替此行 kill.addActionListener(this);:

kill.addActionListener(new ActionListener()
{
    public void actionPerformed ( ActionEvent e )
    {
        popUpKalenderWindow.setVisible( false );
    }
});

要使上述代码正常工作，请将您的 popUpKalenderWindow 标记为 final。

final JPopupMenu popUpKalenderWindow = new JPopupMenu();