如何在JFrame上使用JMenu在外部类上切换Jpanel

我试图用Java编写程序。它正在与Jmenu和Jmenu项目合作。我的目标是为每个外部类的Jmenu项目提供一个Jpanel。 Netbeans帮我做了我的菜单基础......但我不明白我如何从外部类使用Jpanel。我寻找的例子，但我找不到可以帮助我或看起来像我的问题。如何在JFrame上使用JMenu在外部类上切换Jpanel

感谢您的任何帮助。

JFrame中：

import javax.swing.JMenu; 
import javax.swing.JMenuBar; 
import javax.swing.JMenuItem; 

public class NewJFrame extends javax.swing.JFrame { 


public NewJFrame() { 
    initComponents(); 
} 

@SuppressWarnings("unchecked") 
// <editor-fold defaultstate="collapsed" desc="Generated Code">       
private void initComponents() { 

    jMenuBar1 = new javax.swing.JMenuBar(); 
    jMenu1 = new javax.swing.JMenu(); 
    jMenu2 = new javax.swing.JMenu(); 
    jMenuItem1 = new javax.swing.JMenuItem(); 
    jMenu3 = new javax.swing.JMenu(); 
    jMenuItem2 = new javax.swing.JMenuItem(); 

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

    jMenu1.setText("Accueil"); 

    jMenuBar1.add(jMenu1); 

    jMenu2.setText("Caisse"); 

    jMenuItem1.setText("Ouvrir Caisse"); 

    jMenuItem1.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      jMenuItem1ActionPerformed(evt); 
     } 
    }); 
    jMenu2.add(jMenuItem1); 

    jMenuBar1.add(jMenu2); 

    jMenu3.setText("Consultation"); 

    jMenuItem2.setText("Consulter BD"); 

    jMenuItem2.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      jMenuItem2ActionPerformed(evt); 
     } 
    }); 
    jMenu3.add(jMenuItem2); 

    jMenuBar1.add(jMenu3); 

    setJMenuBar(jMenuBar1); 

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
    getContentPane().setLayout(layout); 
    layout.setHorizontalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGap(0, 455, Short.MAX_VALUE) 
    ); 
    layout.setVerticalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGap(0, 311, Short.MAX_VALUE) 
    ); 

    pack(); 
}// </editor-fold>       

private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) { 
//Jpanel "PanelCaisse" 
}           

private void jMenuItem2ActionPerformed(java.awt.event.ActionEvent evt) {           
//Jpanel "PanelConsult" 
}           

/** 
* @param args the command line arguments 
*/ 
public static void main(String args[]) { 
    /* Set the Nimbus look and feel */ 
    //<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(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (InstantiationException ex) { 
     java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (IllegalAccessException ex) { 
     java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
     java.util.logging.Logger.getLogger(NewJFrame.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 NewJFrame().setVisible(true); 
     } 
    }); 
} 

// Variables declaration - do not modify      
private JMenu jMenu1; 
private JMenu jMenu2; 
private JMenu jMenu3; 
private JMenuBar jMenuBar1; 
private JMenuItem jMenuItem1; 
private JMenuItem jMenuItem2; 
// End of variables declaration     

private static class label { 

    private static void setText(String mode_Caisse) { 
     throw new UnsupportedOperationException("Not supported yet."); 
    } 

    public label() { 
    } 
    } 
}

面板 “储蓄银行”（测试）

import java.awt.Graphics; 
import javax.swing.JPanel; 
public class PanelCaisse extends JPanel { 
    public void paintComponent(Graphics g){     
    int x1 = this.getWidth()/4; 
    int y1 = this.getHeight()/4;      
    g.fillOval(x1, y1, this.getWidth()/2, this.getHeight()/2); 
    }  
}

面板 “请教”

import javax.swing.GroupLayout; 
import javax.swing.JButton; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JTextField; 

public class PanelConsult extends javax.swing.JPanel { 

private JTextField jTextField1; 
private JButton jButton1; 
private JLabel jLabel1; 
private JPanel panelc = new JPanel(); 

public void ConsultBD() { 
jTextField1 = new javax.swing.JTextField(); 
jLabel1 = new javax.swing.JLabel(); 
jButton1 = new javax.swing.JButton(); 

jLabel1.setText("Votre recherche"); 
jButton1.setText("Ok"); 
jTextField1.setText("Recherche"); 

GroupLayout layout = new GroupLayout(panelc); 
panelc.setLayout(layout); 
layout.setAutoCreateGaps(true); 
layout.setAutoCreateContainerGaps(true); 

    layout.setHorizontalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() 
      .addContainerGap() 
      .addComponent(jLabel1) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
      .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 121, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
      .addComponent(jButton1) 
      .addContainerGap(192, Short.MAX_VALUE)) 
    ); 
    layout.setVerticalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addContainerGap() 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
       .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addComponent(jLabel1) 
       .addComponent(jButton1)) 
      .addContainerGap(277, Short.MAX_VALUE))   
    ); 
} 
}

来源

2014-01-17 Florent Delage

你能解释一下吗？你想要一个面板被加载到一个新的类或别的东西吗？ – Gagan93

如果这是使用NetBeans GUI生成器完成的，并且如果您有关于swing的知识，我们无法为您提供帮助。顺便说一句，答案是：使用CardLayout。 –

就是这样。因为我将有超过10个面板和所有的MenuItem，我认为为Jframe的每个外部设置一个面板和一个类是一个好主意。是的，我正在使用Netbeans，但我试图了解它是如何工作的，而且我正在寻求解决这个问题。 –

这是功能演示演示了如何申请CardLayout在你的问题上：

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 

public class CardLayoutDemo { 
    JFrame frame = new JFrame(); 
    JMenuBar menuBar = new JMenuBar(); 
    JMenu mnuPanels = new JMenu("Panels"); 
    JMenuItem mniFirstPanel = new JMenuItem("First panel"); 
    JMenuItem mniSecondPanel = new JMenuItem("Second panel"); 
    JPanel panel = new JPanel(); 
    JPanel pnlFirst = new JPanel(); 
    JPanel pnlSecond = new JPanel(); 
    CardLayout cardLayout = new CardLayout(); 

    public CardLayoutDemo() { 
     panel.setLayout(cardLayout); 
     pnlFirst.add(new JLabel("This is first panel")); 
     pnlSecond.add(new JLabel("This is second panel")); 
     //Add panels and set constraints. 
     panel.add(pnlFirst, "pnlFirst"); 
     panel.add(pnlSecond, "pnlSecond"); 
     //Shows first layout on startup of application. 
     /*Pass parent container (where you set CardLayout) and 
     * constraint of panel you would like to show. 
     * */ 
     cardLayout.show(panel, "pnlFirst"); 
     //Add menu and menu items. 
     menuBar.add(mnuPanels); 
     mnuPanels.add(mniFirstPanel); 
     mnuPanels.add(mniSecondPanel); 

     mniFirstPanel.addActionListener(new ActionListener() { 
      @Override 
      public void actionPerformed(ActionEvent e) { 
       //Shows pnlFirst 
       cardLayout.show(panel, "pnlFirst"); 
      } 
     }); 

     mniSecondPanel.addActionListener(new ActionListener() { 
      @Override 
      public void actionPerformed(ActionEvent e) { 
       //Shows pnlSecond 
       cardLayout.show(panel, "pnlSecond"); 
      } 
     }); 

     frame.setJMenuBar(menuBar); 
     frame.add(panel); 
     frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 
     frame.setSize(640, 480); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       new CardLayoutDemo(); 
      } 
     }); 
    } 

}

想法使用CardLayout是完美的，但我无法告诉你如何使用NetBeans GUI构建器实现此目的，因为我将它编写为manualy。你应该这样做。

来源

2014-01-17 17:06:50

我只使用Netbeans来显示例子...我正在尝试用eclipse自己完成。感谢这个例子，它会帮助我，而你是对的，它是完美的。 –

如何在JFrame上使用JMenu在外部类上切换Jpanel

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