如何解决单击按钮而不是单独地启动计时器javax.swing
我添加了一个按钮，最初是“请稍候”，并在计时器启动时更改为“单击此处”。我需要这样做，以便如果单击按钮时文本为“ Please Wait”，则它将启动计时器，而不是让计时器在3000毫秒后自行启动。
我还想知道如何设置重新启动按钮，实际上重新启动测试。
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JButton;
import java.awt.FlowLayout;
import java.awt.GridBagLayout;
import java.awt.Dimension;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.Timer;
public class Main extends JFrame implements ActionListener
{
private static final long serialVersionUID = 1L;
//Width and Height of the JFrame
public static final int WIDTH = 550;
public static final int HEIGHT = 550;
//Width and Height of the Add Button
public static final int WIDTH1 = 450;
public static final int HEIGHT1 = 450;
//Width and Height of Restart Button
public static final int WIDTH2 = 125;
public static final int HEIGHT2 = 25;
//Adding the 3 main components
//This is the label that counts the clicks
private JLabel lblValue;
//This is the integer that counts the clicks
private int clicks = 0;
//This is the timer
private int count = 6;
public static void main(String[] args)
{
// This creates two instances of Main,// which creates two different windows.
Main counter1 = new Main( );
counter1.setVisible(true);
Main counter2 = new Main( );
counter2.setVisible(true);
}
public Main( )
{
//Title that appears at the top of the page
setTitle("cps Test");
//Close when the close button is pressed
setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
//Setting size of the frame
setSize(WIDTH,HEIGHT);
setMaximumSize(new Dimension(WIDTH,HEIGHT));
setMinimumSize(new Dimension(WIDTH,HEIGHT));
setLayout(new FlowLayout( ));
// This is the label for the amount of clicks
lblValue = new JLabel("0");
//Adding the counter onto the screen
add(lblValue);
//This is the button that adds 1 every time clicked
JButton addButton = new JButton("Please Wait");
addButton.addActionListener(this);
//Setting size for button
addButton.setSize(new Dimension(WIDTH1,HEIGHT1));
addButton.setPreferredSize(new Dimension(WIDTH1,HEIGHT1));
addButton.setMinimumSize(new Dimension(WIDTH1,HEIGHT1));
addButton.setMaximumSize(new Dimension(WIDTH1,HEIGHT1));
//Adding button onto screen
add(addButton);
JButton resetButton = new JButton("Restart");
//Setting size for button
resetButton.setSize(new Dimension(WIDTH2,HEIGHT2));
resetButton.setPreferredSize(new Dimension(WIDTH2,HEIGHT2));
resetButton.setMinimumSize(new Dimension(WIDTH2,HEIGHT2));
resetButton.setMaximumSize(new Dimension(WIDTH2,HEIGHT2));
//Adds the label for the timer. This changes after 1000 milliseconds to 1,and then counts every second
JLabel label = new JLabel("Starting Soon");
setLayout(new GridBagLayout());
//Adding timer onto the screen
add(label);
//Delay in milliseconds between number adding
Timer timer = new Timer(1000,new ActionListener() {
public void actionPerformed(ActionEvent e) {
//Add 1 to count every interval of 1000 milliseconds
count--;
//Timer keeps ticking till this number is achieved
if (count >= 0) {
label.setText(Integer.toString(count));
}
//Will stop timer,remove the click button and will calculate how many clicks you got per second
else {
((Timer) (e.getSource())).stop();
remove(addButton);
label.setText("");
lblValue.setText("You clicked " + clicks / 5d + " clicks per second.");
add(resetButton);
}
//Will change text from "Please Wait" to "Click Here" after timer delay has finished
if (count == 5) {
addButton.setText("Click Here");
}
}
});
//Timer wont start for 3000 milliseconds
timer.setinitialDelay(3000);
//Start Timer
timer.start();
}
public void actionPerformed(ActionEvent e)
{
String actionCommand = e.getActionCommand( );
//This will only work whilst the text is "Click Here". Wont work for 1000 milliseconds as the text is "Please Wait"
if (actionCommand.equals("Click Here"))
{
//Adds 1 to the click counter ever time it is clicked
lblValue.setText(Integer.toString(clicks += 1));
}
}
}```
解决方法
正如Andrew Thompson所指出的，您将必须经过四个步骤来解决此问题。
1。）Timer应该是该类的全局变量
这一步很重要，因为否则，将无法从我们要创建的ActionListener中访问该对象。
import javax.swing.Timer;
public class Test {
private Timer timer;
public Test() {
}
}
2。）在构造函数中创建计时器元素
在构造函数中，我们现在要初始化计时器，但是-这很重要-我们还不要启动它。
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Timer;
public class Test {
private Timer timer;
private int count = 0;
public Test() {
ActionListener taskPerformer = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
//What should the timer do?
count++;
System.out.println(count);
}
};
timer = new Timer(1000,taskPerformer);
}
}
3。）在开始按钮的ActionListener中启动计时器
在此步骤中，我们添加了通过按按钮启动计时器的功能。为此，我们使用计时器的ActionListener和start()方法。
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.Timer;
public class Test {
private Timer timer;
private int count = 0;
public Test() {
ActionListener taskPerformer = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
//What should the timer do?
count++;
System.out.println(count);
}
};
timer = new Timer(1000,taskPerformer);
JButton start = new JButton("Start");
//Here the functionality is added
start.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
if(!timer.isRunning()) {
System.out.println("Timer started!");
timer.start();
}
}
});
}
}
4。）在停止按钮的ActionListener中停止计时器
这基本上是相反的方法。我们将创建另一个按钮来添加停止计时器的功能。为此，我们将再次使用ActionListener和计时器的stop()方法。
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.Timer;
public class Test {
private Timer timer;
private int count = 0;
public Test() {
ActionListener taskPerformer = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
//What should the timer do?
count++;
System.out.println(count);
}
};
timer = new Timer(1000,taskPerformer);
JButton start = new JButton("Start");
start.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
if(!timer.isRunning()) {
System.out.println("Timer started!");
timer.start();
}
}
});
//Functionality is added here
JButton stop = new JButton("stop");
stop.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
if(timer.isRunning()) {
count = 0;
System.out.println("Timer stopped!");
timer.stop();
}
}
});
}
}
最后一步：创建其余的GUI
这不再是回答您的问题所必需的，但是我想提供一个最小的工作示例。为此，我正在使用SwingUtilities.invokeLater()。有关此操作的详细信息以及为什么要使用它，请参阅this问题。
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class Test {
private Timer timer;
private int count = 0;
public Test() {
ActionListener taskPerformer = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
//What should the timer do?
count++;
System.out.println(count);
}
};
timer = new Timer(1000,taskPerformer);
JButton start = new JButton("Start");
start.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
if(!timer.isRunning()) {
System.out.println("Timer started!");
timer.start();
}
}
});
JButton stop = new JButton("stop");
stop.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
if(timer.isRunning()) {
count = 0;
System.out.println("Timer stopped!");
timer.stop();
}
}
});
//Minimal working example
JFrame frame = new JFrame("Timer");
JPanel panel = new JPanel();
panel.setLayout(new FlowLayout());
panel.add(start);
panel.add(stop);
frame.add(panel);
frame.setSize(300,300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(Test::new);
}
}
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