防止java多次打开同一个窗口-JFrame

发布于 2025-01-08 15:34:38 字数 1195 浏览 3 评论 0原文

例如，我在单击时创建了此

//this creates autor object with default constructor properties defined in autor class
menuAutor.addMouseListener(new MouseAdapter(){
            public void mouseClicked(MouseEvent e)
            {
                autor Autor = new autor("Autor");
            }
        });

对象，因此创建了名为 Autor 的对象，当我再次单击按钮时，它会再次弹出相同的 Autor 对象。如果已经打开了一个窗口，如何防止打开同一窗口？

编辑：终于有解决方案了！经过很多思考......我做出了我的解决方案...... 我在课程开始时声明了 autorOpen="no" 的默认值，只是为了让您知道，因为它在下面的代码中不可见，解决方案本身：

public void mouseClicked(MouseEvent e)
            {
                if(autorOpen=="no") {
                autor Autor = new autor("Autor");
                autorOpen = "yes";
                Autor.addWindowListener(new WindowAdapter(){
                    public void windowClosing(WindowEvent e) 
                    {
                        autorOpen = "no";
                    }
                });
                }
                else 
                    JOptionPane.showMessageDialog(null, "Demo notice... you can't open that window again.. its opened already!","Error",JOptionPane.ERROR_MESSAGE);  
            }
        });

原文

for example i create this on click

//this creates autor object with default constructor properties defined in autor class
menuAutor.addMouseListener(new MouseAdapter(){
            public void mouseClicked(MouseEvent e)
            {
                autor Autor = new autor("Autor");
            }
        });

so object named Autor is created, and when i click again on the button, it pops up again the same Autor object.. how can prevent opening the same window if one is already opened?

EDIT: FINALY A SOLUTION!
After lots of thinking about this.. i made my solution...
default value for autorOpen="no" i declaired at the beginning of my class, just to let you know because its not visible in code below, the solution itself:

public void mouseClicked(MouseEvent e)
            {
                if(autorOpen=="no") {
                autor Autor = new autor("Autor");
                autorOpen = "yes";
                Autor.addWindowListener(new WindowAdapter(){
                    public void windowClosing(WindowEvent e) 
                    {
                        autorOpen = "no";
                    }
                });
                }
                else 
                    JOptionPane.showMessageDialog(null, "Demo notice... you can't open that window again.. its opened already!","Error",JOptionPane.ERROR_MESSAGE);  
            }
        });

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

离旧人 2025-01-15 15:34:38

将变量存储在全局范围内，并在创建新变量之前检查它是否存在。

回复收藏 0 原文

森林很绿却致人迷途 2025-01-15 15:34:38

您还可以考虑将 Autor 实现为单例类（以确保只有一个被实例化）。

public class Autor {

private static Autor instance = null;

//Must be protected or private, get a reference to this class with getInstance().
protected Autor() {
}


/**
* Returns reference to this class - use in place of constructor
*/
public static Autor getInstance() {
if(instance == null) {
instance = new Autor();
}
return instance;
}
}

You could also consider implementing Autor as a singleton class (to ensure only one is ever instantiated).

public class Autor {

private static Autor instance = null;

//Must be protected or private, get a reference to this class with getInstance().
protected Autor() {
}


/**
* Returns reference to this class - use in place of constructor
*/
public static Autor getInstance() {
if(instance == null) {
instance = new Autor();
}
return instance;
}
}

回复收藏 0 原文