Java 扫描仪等待用户输入时GUI冻结
我意识到您需要使用事件调度线程来避免冻结和死锁,但现在我来谈谈冻结问题。我怀疑我有这个问题是由于封装的EDT 这是具有主要静态方法的类:Java 扫描仪等待用户输入时GUI冻结,java,multithreading,swing,user-interface,Java,Multithreading,Swing,User Interface,我意识到您需要使用事件调度线程来避免冻结和死锁,但现在我来谈谈冻结问题。我怀疑我有这个问题是由于封装的EDT 这是具有主要静态方法的类: @SuppressWarnings("serial") public class WelcomeScreen extends JFrame implements ActionListener { /* * initialize variables */ private JButton btnSubmit; private JTextField nameI
@SuppressWarnings("serial")
public class WelcomeScreen extends JFrame implements ActionListener {
/*
* initialize variables
*/
private JButton btnSubmit;
private JTextField nameInput;
private JLabel enterName;
public WelcomeScreen() {
/*
* build the welcome frame with all components
*/
setAlwaysOnTop(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setResizable(false);
setBounds(0, 0, 514, 256);
getContentPane().setLayout(null);
// welcome label
JLabel label_welcome = new JLabel("<html>Welcome to <br/>Game</html>");
label_welcome.setHorizontalAlignment(SwingConstants.CENTER);
label_welcome.setBounds(159, 11, 190, 32);
getContentPane().add(label_welcome);
// create the warrior button
btnSubmit = new JButton("Start");
btnSubmit.setBounds(209, 129, 89, 23);
btnSubmit.addActionListener(this);
btnSubmit.setFocusable(false);
getContentPane().add(btnSubmit);
enterName = new JLabel("Enter Player Name:");
enterName.setBounds(50, 60, 150, 50);
getContentPane().add(enterName);
nameInput = new JTextField();
nameInput.setBounds(212, 70, 125, 25);
getContentPane().add(nameInput);
// set frame visible
setVisible(true);
}
/*
* action listener
*/
public void actionPerformed(ActionEvent evt) {
if (evt.getSource().equals(btnSubmit)) {
dispose();
new Core();
}
}
/*
* <<<<<MAIN STATIC METHOD>>>>>
*/
public static void main(String[] args) {
// safely start the welcome frame
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new WelcomeScreen();
}
});
}
}
@SuppressWarnings(“串行”)
公共类WelcomeScreen扩展JFrame实现ActionListener{
/*
*初始化变量
*/
私人JButton btnSubmit;
私有JTextField name输入;
私有JLabel enterName;
公众福利屏幕(){
/*
*使用所有组件构建欢迎框架
*/
setAlwaysOnTop(真);
setDefaultCloseOperation(关闭时退出);
setLocationRelativeTo(空);
可设置大小(假);
立根(0,0,514,256);
getContentPane().setLayout(null);
//欢迎标签
JLabel label_welcome=新的JLabel(“欢迎来到
游戏”);
label_welcome.setHorizontalAlignment(SwingConstants.CENTER);
标签(159,11,190,32),;
getContentPane().add(label_welcome);
//创建战士按钮
btnSubmit=新的JButton(“开始”);
btnsubunds(209129 89 23);
btnSubmit.addActionListener(此);
btnSubmit.setFocusable(false);
getContentPane().add(btnSubmit);
enterName=新的JLabel(“输入玩家名称:”);
enterName.setBounds(50,60,150,50);
getContentPane().add(enterName);
nameInput=新的JTextField();
nameInput.setBounds(212,70,125,25);
getContentPane().add(nameInput);
//设置帧可见
setVisible(真);
}
/*
*动作监听器
*/
已执行的公共无效操作(操作事件evt){
if(evt.getSource().equals(btnSubmit)){
处置();
新核心();
}
}
/*
*
*/
公共静态void main(字符串[]args){
//安全启动欢迎框架
SwingUtilities.invokeLater(新的Runnable(){
公开募捐{
新WelcomeScreen();
}
});
}
}
这是扩展JFrame的第二个类。这是冻结的GUI。如果查看gameEngine()方法,您会注意到String input=keyboard.next(),导致冻结。如果这一行被注释掉,GUI将显示两个字符串“test1”和“test2”
@SuppressWarnings(“串行”)
公共类核心扩展了JFrame{
/*
*初始化变量
*/
专用扫描仪键盘;
私人JTEXTEXTAREA textArea;
公共核心(){
/*
*创建显示输出消息的框架
*/
立根(0,0,800,400);
可设置大小(假);
setLocationRelativeTo(空);
setAlwaysOnTop(真);
setDefaultCloseOperation(关闭时退出);
getContentPane().setLayout(null);
JPanel面板=新的JPanel();
嵌板.立根(10,11,774,349);
panel.setLayout(空);
getContentPane().add(面板);
textArea=新的JTextArea();
JScrollPane scroll=新的JScrollPane(textArea);
滚动.后退(0,0,774,349);
textArea.setBounds(10,11,443,279);
面板。添加(滚动);
//这甚至没有出现
附加消息(“test1”);
//设置帧可见
setVisible(真);
//这也不是
附加消息(“test2”);
/*
*启动游戏引擎
*/
游戏引擎();
}
/*
*启动游戏引擎
*/
公共游戏引擎(){
//实例化扫描仪
键盘=新扫描仪(System.in);
//
字符串输入=键盘.next();
}
//将消息附加到GUI
公共消息(字符串s){
textArea.append(“>”+s+“\n”);
}
}
您的问题是扫描仪正在阻止Swing事件线程,从而阻止GUI绘制和与用户交互。一个简单的解决方案是在后台线程中进行扫描仪交互。更好的解决方案是完全摆脱扫描仪(System.in),并通过GUI实现所有用户交互。控制台I/O和GUI I/O不应混合使用
使用JTextField和布局管理器获取和响应输入的一个简单示例:
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.*;
@SuppressWarnings("serial")
public class Fu22GamePanel extends JPanel {
private static final int COLS = 50;
private static final int ROWS = 25;
private static final int GAP = 3;
private JTextField entryField = new JTextField(COLS);
private JTextArea textArea = new JTextArea(ROWS, COLS);
private String playerName;
public Fu22GamePanel(String name) {
this.playerName = name;
textArea.setFocusable(false);
textArea.setWrapStyleWord(true);
textArea.setLineWrap(true);
JScrollPane scrollPane = new JScrollPane(textArea);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
EntryAction entryAction = new EntryAction("Submit", KeyEvent.VK_S);
entryField.setAction(entryAction);
JPanel bottomPanel = new JPanel();
bottomPanel.setLayout(new BoxLayout(bottomPanel, BoxLayout.LINE_AXIS));
bottomPanel.add(entryField);
bottomPanel.add(new JButton(entryAction));
setBorder(BorderFactory.createEmptyBorder(GAP, GAP, GAP, GAP));
setLayout(new BorderLayout(GAP, GAP));
add(scrollPane);
add(bottomPanel, BorderLayout.PAGE_END);
}
private class EntryAction extends AbstractAction {
public EntryAction(String name, int mnemonic) {
super(name);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
String text = entryField.getText();
entryField.setText("");
textArea.append("> " + text + "\n");
entryField.requestFocusInWindow();
}
}
private static class WelcomePanel extends JPanel {
private JTextField playerNameField = new JTextField(10);
public WelcomePanel() {
int wpGap = 20;
setBorder(BorderFactory.createEmptyBorder(wpGap, wpGap, wpGap, wpGap));
add(new JLabel("Enter Player Name:"));
add(playerNameField);
}
public String getPlayerName() {
return playerNameField.getText();
}
}
private static void createAndShowGui() {
WelcomePanel welcomePanel = new WelcomePanel();
int response = JOptionPane.showConfirmDialog(null, welcomePanel, "Welcome to the Game", JOptionPane.OK_CANCEL_OPTION);
if (response != JOptionPane.OK_OPTION) {
return;
}
String name = welcomePanel.getPlayerName();
Fu22GamePanel mainPanel = new Fu22GamePanel(name);
JFrame frame = new JFrame("Game -- Player: " + name);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
createAndShowGui();
});
}
}
您的问题是,扫描仪正在阻止Swing事件线程,从而阻止GUI绘制和与用户交互。一个简单的解决方案是在后台线程中进行扫描仪交互。更好的解决方案是完全摆脱扫描仪(System.in),并通过GUI实现所有用户交互。控制台I/O和GUI I/O不应混合使用 使用JTextField和布局管理器获取和响应输入的一个简单示例:
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.*;
@SuppressWarnings("serial")
public class Fu22GamePanel extends JPanel {
private static final int COLS = 50;
private static final int ROWS = 25;
private static final int GAP = 3;
private JTextField entryField = new JTextField(COLS);
private JTextArea textArea = new JTextArea(ROWS, COLS);
private String playerName;
public Fu22GamePanel(String name) {
this.playerName = name;
textArea.setFocusable(false);
textArea.setWrapStyleWord(true);
textArea.setLineWrap(true);
JScrollPane scrollPane = new JScrollPane(textArea);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
EntryAction entryAction = new EntryAction("Submit", KeyEvent.VK_S);
entryField.setAction(entryAction);
JPanel bottomPanel = new JPanel();
bottomPanel.setLayout(new BoxLayout(bottomPanel, BoxLayout.LINE_AXIS));
bottomPanel.add(entryField);
bottomPanel.add(new JButton(entryAction));
setBorder(BorderFactory.createEmptyBorder(GAP, GAP, GAP, GAP));
setLayout(new BorderLayout(GAP, GAP));
add(scrollPane);
add(bottomPanel, BorderLayout.PAGE_END);
}
private class EntryAction extends AbstractAction {
public EntryAction(String name, int mnemonic) {
super(name);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
String text = entryField.getText();
entryField.setText("");
textArea.append("> " + text + "\n");
entryField.requestFocusInWindow();
}
}
private static class WelcomePanel extends JPanel {
private JTextField playerNameField = new JTextField(10);
public WelcomePanel() {
int wpGap = 20;
setBorder(BorderFactory.createEmptyBorder(wpGap, wpGap, wpGap, wpGap));
add(new JLabel("Enter Player Name:"));
add(playerNameField);
}
public String getPlayerName() {
return playerNameField.getText();
}
}
private static void createAndShowGui() {
WelcomePanel welcomePanel = new WelcomePanel();
int response = JOptionPane.showConfirmDialog(null, welcomePanel, "Welcome to the Game", JOptionPane.OK_CANCEL_OPTION);
if (response != JOptionPane.OK_OPTION) {
return;
}
String name = welcomePanel.getPlayerName();
Fu22GamePanel mainPanel = new Fu22GamePanel(name);
JFrame frame = new JFrame("Game -- Player: " + name);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
createAndShowGui();
});
}
}
使用
JTextField
作为输入,与ActionListener
配合使用,您可以对适当的事件(如回车键)做出响应
使用JTextArea
作为输出
请查看,并获取更多详细信息
您可能还想了解一下,这将有助于您将游戏状态与UI分开来维护使用
JTextField
作为输入,再加上ActionListener
,您可以对适当的事件(如回车键)做出响应
使用JTextArea
作为输出
请查看,并获取更多详细信息
您可能还想看看,这将有助于您将游戏状态与UI分开来维护,原因如下。现在,您需要问“为什么?”您是否试图从GUI中的控制台获取用户输入?避免使用
null
布局,像素完美布局在现代ui设计中是一种错觉。影响零部件单个尺寸的因素太多,您无法控制。Swing的设计目的是与核心的布局管理器一起工作,丢弃它们将导致无止境的问题,您将花费越来越多的时间试图解决这些问题rectify@MadProgrammer长话短说,我正在开发一个简单的基于文本的游戏。我发现让JTextField“act”相当于控制台输入非常困难。程序不会等待JTextField输入。这就是为什么在这种情况下,美国
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class NastyAdventure {
public static void main(String[] args) {
new NastyAdventure();
}
public NastyAdventure() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JTextArea output;
private JTextField input;
private boolean isDead = false;
public TestPane() {
setLayout(new BorderLayout());
output = new JTextArea(10, 30);
input = new JTextField(20);
add(new JScrollPane(output));
add(input, BorderLayout.SOUTH);
output.setEditable(false);
output.append("A bear appears on the trial in front of you\n");
output.append("What do you do?");
input.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
input.setText(null);
if (!isDead) {
output.append("\nThe bear eats you, you die\n");
output.append("The adventure is over, the bear wins\n");
} else {
output.append("You're dead, you can't do anything\nThe adventure is over, the bear wins\n");
}
isDead = true;
}
});
}
}
}