Swing NETBEANS：如何使jRadioButton非静态，以便我可以在PSVM中向其添加MouseStener？

我只在Netbeans的JFrame中使用了拖放功能，所以我没有直接编写代码

我有一个名为btnDecafPike的JRadioButton，我希望当用户将鼠标悬停在它上面时，会出现一个JFrame。这是它的代码，它可以工作：

private void btnDecafPikeMouseEntered(java.awt.event.MouseEvent evt) {                                          
    Coffee_DarkRoast c = new Coffee_DarkRoast();
    c.setVisible(true);
}  

但当我使用这段代码时，出现的JFrame不会再消失：

private void btnDecafPikeMouseEntered(java.awt.event.MouseEvent evt) {                                          
    Coffee_DarkRoast c = new Coffee_DarkRoast();
    c.setVisible(true);
}                                         

private void btnDecafPikeMouseExited(java.awt.event.MouseEvent evt) {                                         
    Coffee_DarkRoast c = new Coffee_DarkRoast();
    c.setVisible(false);
}  

因此，我尝试以下代码：

public static void main(String args[]) {
    /* Set the Nimbus look and feel */

    btnDecafPike.addMouseListener(new MouseListener() {

        @Override
        public void mouseClicked(MouseEvent e) {
            throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
        }

        @Override
        public void mousePressed(MouseEvent e) {
            throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
        }

        @Override
        public void mouseReleased(MouseEvent e) {
            throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
        }

        @Override
        public void mouseEntered(MouseEvent e) {
            throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
        }

        @Override
        public void mouseExited(MouseEvent e) {
            throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
        }

    }
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(Beverage.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(Beverage.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(Beverage.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(Beverage.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new Beverage().setVisible(true);
        }
    });
}

---

为什么尝试从psvm附加侦听器？为什么不在JFrame（）中？ \如果仍然必须这样做，请在JFrame上创建一个返回jradiobutton的getter，然后在其上添加侦听器。但我不建议这样做。 我想你需要这样的东西

  Coffee_DarkRoast c = new Coffee_DarkRoast();
private void btnDecafPikeMouseEntered(java.awt.event.MouseEvent evt) {                                          

    c.setVisible(true);
}                                         

private void btnDecafPikeMouseExited(java.awt.event.MouseEvent evt) {                                           
    c.setVisible(false);
} 

---

您的代码正在创建一个要隐藏的新JFrame，因此旧JFrame将保留在屏幕上。

大概，

btnDecafPike

已经在某个类中定义并初始化，也许您应该在其中进行修改。为什么要在“使用鼠标”结束时显示帧？工具提示会更有用吗？对不起。什么是工具提示？工具提示是一个小弹出窗口，当鼠标停留在控件上时会弹出该窗口，以提供额外的上下文，有关详细信息，请参阅details@MadProgrammer我使用了上面编辑过的代码，但只在鼠标悬停时显示一个没有文本的小框。单击按钮时不设置工具提示，到那时有点毫无意义，在初始化时设置它，可能在

initComponents

方法之后

  Coffee_DarkRoast c = new Coffee_DarkRoast();
private void btnDecafPikeMouseEntered(java.awt.event.MouseEvent evt) {                                          

    c.setVisible(true);
}                                         

private void btnDecafPikeMouseExited(java.awt.event.MouseEvent evt) {                                           
    c.setVisible(false);
}