将计时器添加到Java Swing

好吧，我很抱歉在短时间内发布了多个问题，但我正试图让这个时间倒数从3到0 ……这是我的代码

import javax.swing.*; import java.awt.*; import java.awt.event.*; public class ClickingGame extends JPanel implements ActionListener { private static final long serialVersionUID = 1L; static JFrame frame; static JButton startbutton, clickingbutton, timerstop; static JLabel timelabel, scorelabel; static int time = 3; static JTextField entertime; static Timer clock; static Timer countdown; static int score = 0; public ClickingGame() { setLayout(new GridLayout(3, 2, 5, 5)); startbutton = new JButton("Start CountDown"); timelabel = new JLabel("Time Left = NULL", SwingConstants.CENTER); entertime = new JTextField(); clickingbutton = new JButton("Click Here!"); scorelabel = new JLabel("Score = NULL", SwingConstants.CENTER); timerstop = new JButton("Stop Timer!"); clock = new Timer(1000, this); countdown = new Timer(1000, this); add(entertime); add(startbutton); add(timelabel); add(scorelabel); add(clickingbutton); add(timerstop); clickingbutton.setEnabled(false); timerstop.setEnabled(false); startbutton.addActionListener(this); clickingbutton.addActionListener(this); } public static void openGUI() { frame = new JFrame("Clicking Game"); ClickingGame contentpane = new ClickingGame(); frame.setContentPane(contentpane); frame.pack(); frame.setVisible(true); } public void actionPerformed(ActionEvent e) { if (e.getSource() == startbutton) { startbutton.setEnabled(false); clickingbutton.setEnabled(true); time--; if (time > 0) { countdown.start(); timelabel.setText("Starting In: " + time); } else { countdown.stop(); time = 3; } } if (e.getSource() == clickingbutton) { score++; scorelabel.setText("Score = " + score); } } } 

你可以看到我有我的计时器“倒计时”设置正确，它只计算一次…我试图让它倒数一路到3 …

Answer 1

您需要在actionPerformed为countdown对象添加一个案例作为源。

编辑：

你可以尝试这样的事情：

  if (e.getSource() == startbutton) { startbutton.setEnabled(false); clickingbutton.setEnabled(true); if (time > 0) { countdown.start(); timelabel.setText("Starting In: " + time); } } if (e.getSource() == countdown){ timelabel.setText("Starting In: " + time); if (time == 0) { countdown.stop(); time = 3; } else { time--; } }