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本文介紹了Java Swing計時器未清除的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！

問題描述

我在使用Java Swing的計時器功能時遇到了一些問題。我對Java編程相當陌生，因此非常感謝您的幫助。我已經在這個網站上看了很多其他的計時器問題，但沒有一個回答我的問題。我已經做了一個圖形用戶界面，允許你玩石頭布剪刀，你可以點擊三個按鈕進行選擇。我希望我的程序在您單擊按鈕后休眠大約1秒，并在它顯示一條消息后再次休眠。在我意識到Thad.sleep()不適用于我的圖形用戶界面后，我嘗試實現了一個計時器。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*; 
import javax.swing.border.Border;
import java.io.*;

public class rps { 
//ROCK PAPER SCISSORS
static JLabel middle = new JLabel();
static JLabel them = new JLabel();
static JLabel yourWins = new JLabel();
static JLabel theirWins = new JLabel();
static JPanel yourPanel = new JPanel();
static JPanel middlePanel = new JPanel();
static JLabel blank1 = new JLabel();
static JLabel blank2 = new JLabel();
static JButton rock = new JButton("Rock");
static JButton paper = new JButton("Paper");
static JButton scissors = new JButton("Scissors");
static int yw = 0;
static int tw = 0;
static ButtonHandler listener = new ButtonHandler();

public static void main(String[] args) { 

    //Create the frame
    JFrame frame = new JFrame("Rock Paper Scissors");
    frame.setSize(500, 500); //Setting the size of the frame

    middle.setFont(new Font("Serif", Font.PLAIN, 30)); 
    middle.setHorizontalAlignment(SwingConstants.CENTER);
    them.setFont(new Font("Serif", Font.PLAIN, 15));
    them.setHorizontalAlignment(SwingConstants.CENTER);
    yourWins.setHorizontalAlignment(SwingConstants.CENTER);
    theirWins.setHorizontalAlignment(SwingConstants.CENTER);

    //Creating panels
    JPanel bigPanel = new JPanel();

    Border border = BorderFactory.createLineBorder(Color.BLACK, 1); 
    Border wlb = BorderFactory.createLineBorder(Color.RED, 1); 
    them.setBorder(border);
    yourPanel.setBorder(border);
    bigPanel.setBorder(border);
    yourWins.setBorder(wlb);
    theirWins.setBorder(wlb);
    middlePanel.setBorder(border);

    //Creating grid layouts 
    GridLayout yourGrid = new GridLayout(1,3,10,10); 
    GridLayout theirGrid = new GridLayout(1,1); //One row, one column
    GridLayout middleGrid = new GridLayout(5,1);
    GridLayout bigGrid = new GridLayout(3,1);//Two rows, one column

    //Setting the layouts of each panel to the grid layouts created above
    yourPanel.setLayout(yourGrid); //Adding layout to buttons panel
    them.setLayout(theirGrid); //Adding layout to label panel
    middlePanel.setLayout(middleGrid); 
    bigPanel.setLayout(bigGrid);

    //Adding r/p/s to your grid.
    yourPanel.add(rock);
    yourPanel.add(paper);
    yourPanel.add(scissors);

    //Adding w/l rations to middlegrid.
    middlePanel.add(theirWins);
    middlePanel.add(blank1);
    middlePanel.add(middle);
    middlePanel.add(blank2);
    middlePanel.add(yourWins);

    //Attaching the listener to all the buttons
    rock.addActionListener(listener);
    paper.addActionListener(listener);
    scissors.addActionListener(listener);

    bigPanel.add(them);
    bigPanel.add(middlePanel);
    bigPanel.add(yourPanel); 

    //Shows the score at 0-0.
    yourWins.setText("Your wins: " + yw);
    theirWins.setText("Their wins: " + tw);

    frame.getContentPane().add(bigPanel); //panel to frame 
    frame.setVisible(true); // Shows frame on screen
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

//Class represents what do when a button is pressed
private static class ButtonHandler implements ActionListener { 
    public void actionPerformed (ActionEvent e) {
        Timer timer = new Timer(1000, this);

        String tc = random();
        them.setText("They chose: " + tc + "!");
        if (e.getSource() == rock) {
            whoWins("rock", tc);
        } else if (e.getSource() == paper) {
            whoWins("paper", tc);
        } else if (e.getSource() == scissors) {
            whoWins("scissors", tc);
        }
        yourWins.setText("Your wins: " + yw);
        theirWins.setText("Their wins: " + tw);

        timer.setRepeats(false);
        timer.start();
    }
} 

public static String random() {
    int random = (int) (Math.random() * 3);
    if (random == 0) {
        return "Rock";
    } else if (random == 1) {
        return "Paper";
    } else if (random == 2) {
        return "Scissors";
    }
    return "";
}

public static void whoWins(String yc, String tc) {
    if (yc.equals("rock")) {
        if (tc.equals("Rock")) {
            middle.setText("It's a tie!");            
        } else if (tc.equals("Paper")) {
            middle.setText("You lose!");
            tw++;
        } else if (tc.equals("Scissors")) {
            middle.setText("You win!");
            yw++;
        }
    } else if (yc.equals("paper")) {
        if (tc.equals("Rock")) {
            middle.setText("You win!");
            yw++;
        } else if (tc.equals("Paper")) {
            middle.setText("It's a tie!");
        } else if (tc.equals("Scissors")) {
            middle.setText("You lose!");
            tw++;
        }
    } else if (yc.equals("scissors")) {
        if (tc.equals("Rock")) {
            middle.setText("You lose!");
            tw++;
        } else if (tc.equals("Paper")) {
            middle.setText("You win!");
            yw++;
        } else if (tc.equals("Scissors")) {
            middle.setText("It's a tie!");
        }
    }
}
}

實際發生的情況是，從我按下按鈕到顯示一條消息沒有延遲，因為很明顯我沒有正確使用計時器。我希望計時器只運行一次，運行后代碼將執行。但是，當我單擊一個按鈕時，計時器將在Repeat上運行，盡管setRepeats為假。因此，我想要顯示的消息不會被延遲，而是會立即顯示，但隨后會循環顯示一條消息(該消息是隨機的)，直到我關閉程序。如果我再次點擊按鈕，它似乎會使計時器的速度加倍，消息的顯示速度也會快一倍，以此類推。

them.setText("They chose: " + tc + "!");

這是在Repeat上顯示的消息，變量TC每次都會更改。計時器似乎只是在每隔計時器間隔(1s)顯示此消息。

如有任何幫助，我們將不勝感激。

編輯：

所以我添加了這個部分：

private static class ButtonHandler implements ActionListener { 
    public void actionPerformed (ActionEvent e) {
        // I'd be disabling the buttons here to prevent
        // the user from trying to trigger another 
        // update...

        // This is an instance field which is used by your
        // listener

        Timer timer = new Timer(1000, listenert);
        timer.setRepeats(false);
        timer.start();
    }
}
private static class timer implements ActionListener {
    public void actionPerformed (ActionEvent e) {
        String tc = random(); //A method that chooses a random word.
        them.setText("They chose: " + tc + "!"); 
        if (e.getSource() == rock) {
            whoWins("rock", tc); //whoWins is a method that will display a message.
        } else if (e.getSource() == paper) {
            whoWins("paper", tc);
        } else if (e.getSource() == scissors) {
            whoWins("scissors", tc);
        }
        yourWins.setText("Your wins: " + yw);
        theirWins.setText("Their wins: " + tw);

        // Start another Timer here that waits 1 second
        // and re-enables the other buttons...
    }
}

所以我認為現在發生的事情是，當我單擊一個按鈕時，按鈕處理程序偵聽器啟動定時器，該定時器附加到定時器偵聽器(名為listenert)，該定時器將運行Timer類的action Perform中的代碼。但是，睡眠功能仍然不起作用

編輯2.5版：

 private static class ButtonHandler implements ActionListener { 
    public void actionPerformed (ActionEvent e) {
        final JButton button = (JButton)e.getSource();
        Timer timer = new Timer(1000, new ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                        String tc = random();
                        them.setText("They chose: " + tc + "!");
                        if (button == rock) {
                            whoWins("rock", tc);
                        } else if (button == paper) {
                            whoWins("paper", tc);
                        } else if (button == scissors) {
                            whoWins("scissors", tc);
                        }
                        yourWins.setText("Your wins: " + yw);
                        theirWins.setText("Their wins: " + tw);
                    }
                });
        timer.setRepeats(false);
        timer.start();     

    }
} 

這就是我到目前為止所擁有的，我只需要在她的睡眠之后再增加一點
The.setText(“他們選擇：”+TC+”！”)；
我應該把計時器放在哪里？如果有，我會把它放在哪里？Timer.start()位于方法的末尾，我不太理解。

推薦答案

因此，您提供給Timer的ActionListener會在計時器”滴答”時收到通知，因此ButtonHandleractionPerformed應該看起來更像…

public void actionPerformed (ActionEvent e) {
    // I'd be disabling the buttons here to prevent
    // the user from trying to trigger another 
    // update...

    // This is an instance field which is used by your
    // listener
    choice = e.getSource();

    Timer timer = new Timer(1000, listener);
    timer.setRepeats(false);
    timer.start();
}

和您的listener應該更像

public void actionPerformed (ActionEvent e) {
    String tc = random(); //A method that chooses a random word.
    them.setText("They chose: " + tc + "!"); 
    if (choice == rock) {
        whoWins("rock", tc); //whoWins is a method that will display a message.
    } else if (choice == paper) {
        whoWins("paper", tc);
    } else if (choice == scissors) {
        whoWins("scissors", tc);
    }
    yourWins.setText("Your wins: " + yw);
    theirWins.setText("Their wins: " + tw);

    // Start another Timer here that waits 1 second
    // and re-enables the other buttons...
}

例如…

您可以考慮查看How to use Swing Timers以了解更多詳細信息

更新

從一個簡單的例子開始…
公共類TestPane擴展JPanel{

    private JLabel label;
    private SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");

    public TestPane() {
        setLayout(new GridBagLayout());
        label = new JLabel();
        add(label);
        tick();

        Timer timer = new Timer(500, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                tick();
            }
        });
        timer.start();
    }

    protected void tick() {

        label.setText(sdf.format(new Date()));

    }
}

這只是每隔半秒調用tick方法以更新JLabel…

上的時間

這篇關于Java Swing計時器未清除的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，