我正在设计一个GUI(GUI本身在一个名为mainGUI的单独类中)。GUI有2个按钮。每个按钮将main.subProgramNumber
设置为1或2(取决于按钮),将main.safeToContinue
设置为false,然后使用dispose()
处理GUI。但是当我单击GUI中的按钮时,GUI关闭,然后什么也没有发生。
当我用调试器测试这个时,它的行为与我正常运行程序时不同。当使用调试工具时,GUI在我单击按钮后保持打开状态,并永远加载。
下面是我的主代码
genData main = new genData();
main.safeToContinue = false;
main.running = true;
while(main.running == true){
//trigger GUI
mainGUI MG = new mainGUI();
MG.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
MG.setSize(250, 275);
MG.setVisible(true);
//wait tell the GUI says its safe to continue
while(main.safeToContinue == false){
try {
TimeUnit.MILLISECONDS.sleep(1);
} catch (InterruptedException ex) {
Logger.getLogger(mainGUI.class.getName()).log(Level.SEVERE, null, ex);
}
}
//check if main.subProgram is 1
if(main.subProgramNumber == 1){
System.out.println("subProgram = 1");
}
//check if main.subProgram is 2
if(main.subProgramNumber == 2){
System.out.println("subProgram = 2");
}
}
下面是我的GUI代码的简化版本。(抱歉,代码有点多,但我想不出如何使它比这更简单...)
public class mainGUI extends JFrame{
public JButton add;
public JButton remove;
public JButton edit;
public JButton report;
public JButton close;
public mainGUI(){
super("Guest Manager");
setLayout(new FlowLayout());
add = new JButton("Add a Guest");
remove = new JButton("Remove a Guest");
close = new JButton("Close");
add(add);
add(remove);
add(close);
addGuest ag = new addGuest();
add.addActionListener(ag);
removeGuest rg = new removeGuest();
remove.addActionListener(rg);
Close c = new Close();
close.addActionListener(c);
}
private class addGuest implements ActionListener{
public void actionPerformed(ActionEvent e){
genData main = new genData();
main.subProgramNumber = 1;
main.safeToContinue = true;
dispose();
}
}
private class removeGuest implements ActionListener{
public void actionPerformed(ActionEvent e){
genData main = new genData();
main.subProgramNumber = 2;
main.safeToContinue = true;
dispose();
}
}
private class Close implements ActionListener{
public void actionPerformed(ActionEvent e){
genData main = new genData();
main.safeToContinue = true;
dispose();
}
}
}
下面是一个我曾经使用过的技术的示例(上面也在使用)
主程序(这是调用当我点击开始):
varData MC = new varData();
do{
MC.safeToContinue = false;
//open and run the main GUI
ExerciseMainGUI EM = new ExerciseMainGUI();
EM.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
EM.setSize(250, 275);
EM.setVisible(true);
//System.out.println("debug 1");
//wait tell the sub program closes to continue
do{
hutLib.pause(1);
}while(MC.safeToContinue==false);
hutLib.pause(1);
}while(MC.running == true);
我在上面调用GUI:
public class ExerciseMainGUI extends JFrame{
private JButton bottlePacker;
private JButton triangleTester;
private JButton primeChecker;
private JButton averager;
private JButton rollTheDice;
private JButton close;
public ExerciseMainGUI(){
super("Java Exercises");
setLayout(new FlowLayout());
bottlePacker = new JButton(" Bottle Packer ");
triangleTester = new JButton(" Triangle Tester ");
primeChecker = new JButton(" Prime Checker ");
averager = new JButton ("Averager (offline)");
rollTheDice = new JButton("Roll the Dice (offline)");
close = new JButton(" Close ");
add(bottlePacker);
add(triangleTester);
add(primeChecker);
add(averager);
add(rollTheDice);
add(close);
bottlePacker bp = new bottlePacker();
bottlePacker.addActionListener(bp);
triangleTester tt = new triangleTester();
triangleTester.addActionListener(tt);
primeChecker pc = new primeChecker();
primeChecker.addActionListener(pc);
averager a = new averager();
averager.addActionListener(a);
rollTheDice rtd = new rollTheDice();
rollTheDice.addActionListener(rtd);
close c = new close();
close.addActionListener(c);
}
private class bottlePacker implements ActionListener{
public void actionPerformed(ActionEvent e){
dispose();
//runs a subprogram
}
}
private class triangleTester implements ActionListener{
public void actionPerformed(ActionEvent e){
dispose();
//runs a subprogram
}
}
private class primeChecker implements ActionListener{
public void actionPerformed(ActionEvent e){
dispose();
//runs a subprogram
}
}
private class averager implements ActionListener{
public void actionPerformed(ActionEvent e){
dispose();
//runs a subprogram
}
}
private class rollTheDice implements ActionListener{
public void actionPerformed(ActionEvent e){
dispose();
//runs a subprogram
//JOptionPane.showMessageDialog(null, "NOTE: Roll the Dice will run in the command line.");
//oldCodeStorage.rollTheDice.rollTheDice();
}
}
private class close implements ActionListener{
public void actionPerformed(ActionEvent e){
dispose();
varData MC = new varData();
MC.running = false;
MC.safeToContinue = true;
}
}
}
注:当每个子程序完成时,其运行以下代码:
varData MC = new varData();
MC.safeToContinue = true;
我知道这是很多,但我明确要求张贴它。
3条答案
按热度按时间xfyts7mz1#
你在这里误用了Swing组件。你应该显示你的应用并通过事件监听器对事件做出React。这不需要循环等。
例如
还要记住,不要在
actionListeners
中调用代价高昂的操作,而是将这些操作委托给后台作业-否则会冻结您的UI。在Swing中编写UI应用程序并不像您想象的那么简单,需要少量的基础知识(关于Swing本身)。尝试一下还不错,但是在不熟悉Swing的基础知识的情况下,你会无数次撞到墙上-相信我,我也经历过。您提到过您是线程化的新手- Swing本身是单线程的-但它涉及到线程化来执行各种任务,这些任务会降低应用程序的速度或使其无法响应。
我强烈建议你开始钻研甲骨文的Swing教程。
https://docs.oracle.com/javase/tutorial/uiswing/index.html
2eafrhcq2#
你根本就没有修改
main.safeToContinue
,这就是为什么它会陷入无限while循环lf3rwulv3#
假设我们有一个类。
现在我有了这个对象的两个示例。
你希望输出是什么?
B有它自己的示例变量,所以我希望输出是。
五、一
在代码中调用
new genData()
创建类的一个新示例,如果字段不是静态的,那么它不会与正在检查的genData版本共享。也请使用java命名约定。
GenData
更适合作为类名。如何修复。