Auto-Fokus auf einem jButton auf einem jpanel

Question

Ich habe eine JPanel geladen auf einem JFrame. Das JPanel enthält 4 JButtons. Die Sache, die ich versuche zu tun, ist, den Fokus automatisch auf den ersten jbutton zu richten, so dass ich zwischen den JButtons mit der Tastatur traversieren kann.

Ich habe versucht, die jButton1.requestFocusInWindow(); Code im Konstruktor des Jpanel, aber es hat immer noch nicht funktioniert. Gibt es etwas, das ich vermisse? Was kann ich noch tun?

Edit: Das Projekt enthält drei Java-Dateien und deren Code lautet wie folgt:

NewJFrame.java

/* 
* To change this template, choose Tools | Templates 
* and open the template in the editor. 
*/ 
package sampleui; 

import java.awt.Container; 
import java.awt.Toolkit; 
import javax.swing.JRootPane; 
import javax.swing.UIManager; 

/** 
* 
* @author Administrator 
*/ 
public class NewJFrame extends javax.swing.JFrame { 

static Container container; 

/** 
* Creates new form NewJFrame 
*/ 
public NewJFrame() { 
    initComponents(); 
    rootPane= getRootPane(); 
    container=getContentPane(); 
    setSize(Toolkit.getDefaultToolkit().getScreenSize()); 
    setVisible(true); 

} 

/** 
* This method is called from within the constructor to initialize the form. 
* WARNING: Do NOT modify this code. The content of this method is always 
* regenerated by the Form Editor. 
*/ 
@SuppressWarnings("unchecked") 
// <editor-fold defaultstate="collapsed" desc="Generated Code">       
private void initComponents() { 

    jMenuItem1 = new javax.swing.JMenuItem(); 
    jPanel1 = new javax.swing.JPanel(); 
    jLabel2 = new javax.swing.JLabel(); 
    jLabel5 = new javax.swing.JLabel(); 
    jLabel6 = new javax.swing.JLabel(); 
    jLabel1 = new javax.swing.JLabel(); 
    jLabel3 = new javax.swing.JLabel(); 
    jPanel2 = new javax.swing.JPanel(); 
    jLabel7 = new javax.swing.JLabel(); 
    jLabel8 = new javax.swing.JLabel(); 
    jLabel9 = new javax.swing.JLabel(); 
    jDesktopPane1 = new javax.swing.JDesktopPane(); 

    jMenuItem1.setText("jMenuItem1"); 

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 
    setTitle("This is the Title"); 

    jPanel1.setBackground(new java.awt.Color(204, 204, 204)); 
    jPanel1.setLayout(new java.awt.BorderLayout()); 

    jLabel2.setForeground(new java.awt.Color(255, 255, 255)); 
    jPanel1.add(jLabel2, java.awt.BorderLayout.PAGE_START); 

    jLabel5.setFont(new java.awt.Font("Tahoma", 1, 14)); // NOI18N 
    jLabel5.setForeground(new java.awt.Color(51, 51, 51)); 
    jLabel5.setText("dfgdfgdfg"); 
    jPanel1.add(jLabel5, java.awt.BorderLayout.LINE_START); 

    jLabel6.setFont(new java.awt.Font("Tahoma", 1, 14)); // NOI18N 
    jLabel6.setText("dfgdfgdfg"); 
    jPanel1.add(jLabel6, java.awt.BorderLayout.LINE_END); 

    jLabel1.setFont(new java.awt.Font("Tahoma", 1, 14)); // NOI18N 
    jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 
    jLabel1.setText("dfgdfgfdgfdgfdg"); 
    jPanel1.add(jLabel1, java.awt.BorderLayout.CENTER); 

    jLabel3.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 
    jLabel3.setText("jLabel3"); 
    jPanel1.add(jLabel3, java.awt.BorderLayout.PAGE_END); 

    getContentPane().add(jPanel1, java.awt.BorderLayout.PAGE_START); 

    jPanel2.setBackground(new java.awt.Color(204, 204, 204)); 
    jPanel2.setLayout(new java.awt.BorderLayout()); 

    jLabel7.setText("jLabel7"); 
    jPanel2.add(jLabel7, java.awt.BorderLayout.LINE_START); 

    jLabel8.setHorizontalAlignment(javax.swing.SwingConstants.TRAILING); 
    jLabel8.setText("jLabel8"); 
    jPanel2.add(jLabel8, java.awt.BorderLayout.LINE_END); 

    jLabel9.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 
    jLabel9.setText("jLabel9"); 
    jPanel2.add(jLabel9, java.awt.BorderLayout.CENTER); 

    getContentPane().add(jPanel2, java.awt.BorderLayout.PAGE_END); 

    jDesktopPane1.addMouseListener(new java.awt.event.MouseAdapter() { 
     public void mouseClicked(java.awt.event.MouseEvent evt) { 
      jDesktopPane1MouseClicked(evt); 
     } 
    }); 
    getContentPane().add(jDesktopPane1, java.awt.BorderLayout.CENTER); 

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

private void jDesktopPane1MouseClicked(java.awt.event.MouseEvent evt) {           
    // TODO add your handling code here: 

    container=getContentPane(); 
    setSize(Toolkit.getDefaultToolkit().getScreenSize()); 
    setVisible(true); 

    //callCompanyOption(); 

    container.setVisible(false); 
    jDesktopPane1.setVisible(false); 
    NewJPanel p=new NewJPanel(); 
    //p.setBounds(40, 30, 1200, 786); 
    container.add(p); 
    container.setVisible(true); 

}           


/** 
* @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 javax.swing.JDesktopPane jDesktopPane1; 
private javax.swing.JLabel jLabel1; 
private javax.swing.JLabel jLabel2; 
private javax.swing.JLabel jLabel3; 
private javax.swing.JLabel jLabel5; 
private javax.swing.JLabel jLabel6; 
private javax.swing.JLabel jLabel7; 
private javax.swing.JLabel jLabel8; 
private javax.swing.JLabel jLabel9; 
private javax.swing.JMenuItem jMenuItem1; 
private javax.swing.JPanel jPanel1; 
private javax.swing.JPanel jPanel2; 
// End of variables declaration     
} 

NewJPanel.java

/* 
* To change this template, choose Tools | Templates 
* and open the template in the editor. 
*/ 
package sampleui; 

import java.awt.Component; 
import java.awt.Container; 
import java.awt.event.KeyEvent; 

/** 
* 
* @author Administrator 
*/ 
public class NewJPanel extends javax.swing.JPanel { 


/** 
* Creates new form NewJPanel 
*/ 
public NewJPanel() { 
    initComponents(); 

} 

/** 
* This method is called from within the constructor to initialize the form. 
* WARNING: Do NOT modify this code. The content of this method is always 
* regenerated by the Form Editor. 
*/ 
@SuppressWarnings("unchecked") 
// <editor-fold defaultstate="collapsed" desc="Generated Code"> 
private void initComponents() { 

    jPanel2 = new javax.swing.JPanel(); 
    jPanel1 = new javax.swing.JPanel(); 
    jButton2 = new javax.swing.JButton(); 
    jXMonthView1 = new org.jdesktop.swingx.calendar.JXMonthView(); 

    setLayout(new java.awt.GridBagLayout()); 

    javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2); 
    jPanel2.setLayout(jPanel2Layout); 
    jPanel2Layout.setHorizontalGroup(
     jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGap(0, 0, Short.MAX_VALUE) 
    ); 
    jPanel2Layout.setVerticalGroup(
     jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGap(0, 0, Short.MAX_VALUE) 
    ); 

    add(jPanel2, new java.awt.GridBagConstraints()); 

    jButton2.setText("OK"); 
    jButton2.setNextFocusableComponent(jButton2); 
    jButton2.addMouseListener(new java.awt.event.MouseAdapter() { 
     public void mouseClicked(java.awt.event.MouseEvent evt) { 
      jButton2MouseClicked(evt); 
     } 
    }); 
    jButton2.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      jButton2ActionPerformed(evt); 
     } 
    }); 
    jButton2.addKeyListener(new java.awt.event.KeyAdapter() { 
     public void keyPressed(java.awt.event.KeyEvent evt) { 
      jButton2KeyPressed(evt); 
     } 
    }); 

    jXMonthView1.addKeyListener(new java.awt.event.KeyAdapter() { 
     public void keyPressed(java.awt.event.KeyEvent evt) { 
      jXMonthView1KeyPressed(evt); 
     } 
    }); 

    javax.swing.GroupLayout jXMonthView1Layout = new javax.swing.GroupLayout(jXMonthView1); 
    jXMonthView1.setLayout(jXMonthView1Layout); 
    jXMonthView1Layout.setHorizontalGroup(
     jXMonthView1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGap(0, 0, Short.MAX_VALUE) 
    ); 
    jXMonthView1Layout.setVerticalGroup(
     jXMonthView1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGap(0, 160, Short.MAX_VALUE) 
    ); 

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); 
    jPanel1.setLayout(jPanel1Layout); 
    jPanel1Layout.setHorizontalGroup(
     jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(jPanel1Layout.createSequentialGroup() 
      .addGap(64, 64, 64) 
      .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) 
       .addComponent(jButton2, javax.swing.GroupLayout.DEFAULT_SIZE, 217, Short.MAX_VALUE) 
       .addComponent(jXMonthView1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
      .addContainerGap(56, Short.MAX_VALUE)) 
    ); 
    jPanel1Layout.setVerticalGroup(
     jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(jPanel1Layout.createSequentialGroup() 
      .addGap(19, 19, 19) 
      .addComponent(jXMonthView1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
      .addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addContainerGap()) 
    ); 

    add(jPanel1, new java.awt.GridBagConstraints()); 
}// </editor-fold> 

private void jButton2MouseClicked(java.awt.event.MouseEvent evt) {          

      jPanel1.setVisible(false); 
      NewJFrame.container.remove(NewJPanel.this); 
      NewJPanel1 p=new NewJPanel1(); 
      NewJFrame.container.add(p); 


}          

private void jButton2KeyPressed(java.awt.event.KeyEvent evt) {          
    // TODO add your handling code here: 
    int key=evt.getKeyCode(); 
    if(key==KeyEvent.VK_ENTER) 
    { 
     System.out.println("Enter Pressed"); 
     jPanel1.setVisible(false); 
     NewJFrame.container.remove(NewJPanel.this); 
     NewJPanel1 p=new NewJPanel1(); 
     NewJFrame.container.add(p); 
    } 
}         

private void jXMonthView1KeyPressed(java.awt.event.KeyEvent evt) {           
    // TODO add your handling code here: 
    jButton2.requestFocus(); 
}          

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { 
    // TODO add your handling code here: 
    jPanel1.setVisible(false); 
     NewJFrame.container.remove(NewJPanel.this); 
     NewJPanel1 p=new NewJPanel1(); 
     NewJFrame.container.add(p); 
} 


// Variables declaration - do not modify 
private javax.swing.JButton jButton2; 
private javax.swing.JPanel jPanel1; 
private javax.swing.JPanel jPanel2; 
private org.jdesktop.swingx.calendar.JXMonthView jXMonthView1; 
// End of variables declaration 
} 

NewJPanel1.java

/* 
* To change this template, choose Tools | Templates 
* and open the template in the editor. 
*/ 
package sampleui; 

import java.awt.Window; 
import java.awt.event.KeyEvent; 
import javax.swing.JRootPane; 

/** 
* 
* @author Administrator 
*/ 
public class NewJPanel1 extends javax.swing.JPanel { 


//=new NewJFrame(); 
/** 
* Creates new form NewJPanel1 
*/ 
public NewJPanel1() { 
    initComponents(); 



} 

/** 
* This method is called from within the constructor to initialize the form. 
* WARNING: Do NOT modify this code. The content of this method is always 
* regenerated by the Form Editor. 
*/ 
@SuppressWarnings("unchecked") 
// <editor-fold defaultstate="collapsed" desc="Generated Code"> 
private void initComponents() { 

    jPanel1 = new javax.swing.JPanel(); 
    jButton1 = new javax.swing.JButton(); 
    jButton2 = new javax.swing.JButton(); 
    jButton3 = new javax.swing.JButton(); 
    jButton4 = new javax.swing.JButton(); 
    jButton5 = new javax.swing.JButton(); 

    setRequestFocusEnabled(false); 
    addKeyListener(new java.awt.event.KeyAdapter() { 
     public void keyPressed(java.awt.event.KeyEvent evt) { 
      formKeyPressed(evt); 
     } 
    }); 
    setLayout(new java.awt.GridBagLayout()); 

    jPanel1.setNextFocusableComponent(jButton5); 
    jPanel1.addKeyListener(new java.awt.event.KeyAdapter() { 
     public void keyPressed(java.awt.event.KeyEvent evt) { 
      jPanel1KeyPressed(evt); 
     } 
     public void keyReleased(java.awt.event.KeyEvent evt) { 
      jPanel1KeyReleased(evt); 
     } 
    }); 

    jButton1.setText("back"); 
    jButton1.addMouseListener(new java.awt.event.MouseAdapter() { 
     public void mouseClicked(java.awt.event.MouseEvent evt) { 
      jButton1MouseClicked(evt); 
     } 
     public void mouseEntered(java.awt.event.MouseEvent evt) { 
      jButton1MouseEntered(evt); 
     } 
    }); 
    jButton1.addKeyListener(new java.awt.event.KeyAdapter() { 
     public void keyPressed(java.awt.event.KeyEvent evt) { 
      jButton1KeyPressed(evt); 
     } 
    }); 

    jButton2.setText("jButton2"); 
    jButton2.addKeyListener(new java.awt.event.KeyAdapter() { 
     public void keyPressed(java.awt.event.KeyEvent evt) { 
      jButton2KeyPressed(evt); 
     } 
    }); 

    jButton3.setText("jButton3"); 
    jButton3.addKeyListener(new java.awt.event.KeyAdapter() { 
     public void keyPressed(java.awt.event.KeyEvent evt) { 
      jButton3KeyPressed(evt); 
     } 
    }); 

    jButton4.setText("jButton4"); 
    jButton4.addKeyListener(new java.awt.event.KeyAdapter() { 
     public void keyPressed(java.awt.event.KeyEvent evt) { 
      jButton4KeyPressed(evt); 
     } 
    }); 

    jButton5.setText("jButton5"); 
    jButton5.setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR)); 
    jButton5.setFocusCycleRoot(true); 
    jButton5.setFocusTraversalPolicyProvider(true); 
    jButton5.setInheritsPopupMenu(true); 
    jButton5.setNextFocusableComponent(jButton4); 
    jButton5.setVerifyInputWhenFocusTarget(false); 
    jButton5.requestFocusInWindow(); 
    jButton5.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      jButton5ActionPerformed(evt); 
     } 
    }); 
    jButton5.addKeyListener(new java.awt.event.KeyAdapter() { 
     public void keyPressed(java.awt.event.KeyEvent evt) { 
      jButton5KeyPressed(evt); 
     } 
    }); 

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); 
    jPanel1.setLayout(jPanel1Layout); 
    jPanel1Layout.setHorizontalGroup(
     jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup() 
      .addContainerGap(41, Short.MAX_VALUE) 
      .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) 
       .addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
       .addComponent(jButton2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
       .addComponent(jButton3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
       .addComponent(jButton4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
       .addComponent(jButton5, javax.swing.GroupLayout.PREFERRED_SIZE, 126, javax.swing.GroupLayout.PREFERRED_SIZE)) 
      .addGap(38, 38, 38)) 
    ); 
    jPanel1Layout.setVerticalGroup(
     jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(jPanel1Layout.createSequentialGroup() 
      .addContainerGap() 
      .addComponent(jButton5) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
      .addComponent(jButton4) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
      .addComponent(jButton3) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
      .addComponent(jButton2) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
      .addComponent(jButton1) 
      .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
    ); 

    jButton5.getAccessibleContext().setAccessibleParent(this); 

    add(jPanel1, new java.awt.GridBagConstraints()); 
    //jButton1.requestFocusInWindow(); 
    //NewJFrame.getRootPane().setDefaultButton(jButton1); 
    //jButton1.requestFocus(); 
}// </editor-fold> 





private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {          
    // TODO add your handling code here: 
    jPanel1.setVisible(false); 
    NewJFrame.container.remove(NewJPanel1.this); 
    NewJPanel p=new NewJPanel(); 
    NewJFrame.container.add(p); 
}          

private void jPanel1KeyPressed(java.awt.event.KeyEvent evt) {         
    // TODO add your handling code here: 

    System.out.println("Key Pressed"); 

}         

private void jButton5KeyPressed(java.awt.event.KeyEvent evt) {          
    // TODO add your handling code here: 
    int key=evt.getKeyCode(); 
    if(key==KeyEvent.VK_ESCAPE) 
    { 
     System.out.println("Escape Pressed"); 
     jPanel1.setVisible(false); 
      NewJFrame.container.remove(NewJPanel1.this); 
      NewJPanel p=new NewJPanel(); 
      NewJFrame.container.add(p); 
    } 
}         

private void jButton4KeyPressed(java.awt.event.KeyEvent evt) {          
    // TODO add your handling code here: 
    int key=evt.getKeyCode(); 
    if(key==KeyEvent.VK_ESCAPE) 
    { 
     System.out.println("Escape Pressed"); 
     jPanel1.setVisible(false); 
      NewJFrame.container.remove(NewJPanel1.this); 
      NewJPanel p=new NewJPanel(); 
      NewJFrame.container.add(p); 
    } 
}         

private void jButton3KeyPressed(java.awt.event.KeyEvent evt) {          
    // TODO add your handling code here: 
    int key=evt.getKeyCode(); 
    if(key==KeyEvent.VK_ESCAPE) 
    { 
     System.out.println("Escape Pressed"); 
     jPanel1.setVisible(false); 
      NewJFrame.container.remove(NewJPanel1.this); 
      NewJPanel p=new NewJPanel(); 
      NewJFrame.container.add(p); 
    } 
}         

private void jButton2KeyPressed(java.awt.event.KeyEvent evt) {          
    // TODO add your handling code here: 
    int key=evt.getKeyCode(); 
    if(key==KeyEvent.VK_ESCAPE) 
    { 
     System.out.println("Escape Pressed"); 
     jPanel1.setVisible(false); 
      NewJFrame.container.remove(NewJPanel1.this); 
      NewJPanel p=new NewJPanel(); 
      NewJFrame.container.add(p); 
    } 
}         

private void jButton1KeyPressed(java.awt.event.KeyEvent evt) {          
    // TODO add your handling code here: 
    int key=evt.getKeyCode(); 
    if(key==KeyEvent.VK_ESCAPE||key==KeyEvent.VK_ENTER) 
    { 
      jPanel1.setVisible(false); 
      NewJFrame.container.remove(NewJPanel1.this); 
      NewJPanel p=new NewJPanel(); 
      NewJFrame.container.add(p); 
    } 
}         

private void jButton1MouseEntered(java.awt.event.MouseEvent evt) {          
    // TODO add your handling code here: 

}          

private void formKeyPressed(java.awt.event.KeyEvent evt) {         
    // TODO add your handling code here: 
    System.out.println("key pressed"); 
}        

private void jPanel1KeyReleased(java.awt.event.KeyEvent evt) {          
    // TODO add your handling code here: 
}         

private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {           
    // TODO add your handling code here: 
}           


// Variables declaration - do not modify 
private javax.swing.JButton jButton1; 
private javax.swing.JButton jButton2; 
private javax.swing.JButton jButton3; 
private javax.swing.JButton jButton4; 
private javax.swing.JButton jButton5; 
public static javax.swing.JPanel jPanel1; 
// End of variables declaration 

}

Der Grund, den Knopf zu fokussieren, liegt darin, zwischen den Tasten mit den Pfeiltasten oder der Tastatur zu verfahren.

Answer 1

Verfahren

jButton1.requestFocus(); 

sollte gut funktionieren. Aber es ist wichtig, wenn Sie diese Methode aufrufen.

Die Methode muss aufgerufen werden, nachdem die Schaltfläche angezeigt wurde. Das heißt, rufen Sie nicht requestFocus() im Konstruktor auf, sondern rufen Sie es, wenn das Panel bereits sichtbar ist. Hier

ist einige Pseudocode:

public NewJFrame() { 
    initComponents(); 
    //some methods ommitted 
    setVisible(true); 

    //change to NewJPanel1 

    //request focus after displaying the NewJPanel1 
} 

EDIT: Hier ist eine konkrete Umsetzung einer möglichen Lösung.

NewPanel.java

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { 
    // TODO add your handling code here: 
    jPanel1.setVisible(false); 
    NewJFrame.container.remove(NewJPanel.this); 
    NewJPanel1 p=new NewJPanel1(); 
    NewJFrame.container.add(p); 

    p.initFocus(); 
} 

NewJPanel1.java

public void initFocus() { 
    jButton5.requestFocus(); 
} 

Answer 2

Probieren Sie dies aus:

public NewJFrame() { 
    initComponents(); 
    rootPane= getRootPane(); 
    container=getContentPane(); 
    setSize(Toolkit.getDefaultToolkit().getScreenSize()); 
    setVisible(true); 

    //added code: 
    JButton jbutton5 = //get from NewJPanel1 
    getRootPane().setDefaultButton(jbutton5); 
    jbutton5.requestFocus(); 
} 

Sie müssten ein Verfahren in NewJPanel1 erstellen Bezug von jbutton5-NewJFrame passieren.

public JButton getDefaultButton() { 
    return jButton5; 
} 

Answer 3

Wenn Sie dies ändern:

public NewJPanel1() { 
    initComponents(); 
} 

dazu:

public NewJPanel1() { 
    initComponents(); 
    addComponentListener(new ComponentListener() { 

     @Override 
     public void componentResized(ComponentEvent ce) {} 

     @Override 
     public void componentMoved(ComponentEvent ce) {} 

     @Override 
     public void componentShown(ComponentEvent ce) { 
      jButton1.requestFocus(); 
     } 

     @Override 
     public void componentHidden(ComponentEvent ce) {} 
    }); 
} 

Dann wird es funktionieren, weil das immer ausgeführt wird, wenn es sichtbar gemacht wird.Es ist nicht sichtbar, bis Sie es zum NewJFrame hinzufügen.

Answer 4

Um Auto-Fokus ein JButton (oder jede Component) auf JPanel, wenn seine Eltern Komponente (JFrame in Ihrem Fall) geladen wird (egal auf welcher Position und, wenn es um seine parent component hinzugefügt wird), die Sie benötigen, um Ihre eigenen erstellen panel die erweitert werden wird JPanel, wo Sie component listener hinzufügen, um component events von der panel zu erhalten. Und schließlich, override die componentMoved und componentShow Methoden von java.awt.event.ComponentListenerinterface wo setzen Sie die Standard-Komponente als die button, die Sie wollen (mit button.requestFocus()). Hier ist der Code, den ich für Demo zur Verfügung gestellt habe. Ich hoffe, dies wird Ihnen helfen, um das Ergebnis zu erzielen, die Sie suchen:

import java.awt.AWTKeyStroke; 
import java.awt.Container; 
import java.awt.GridLayout; 
import java.awt.BorderLayout; 
import java.awt.KeyboardFocusManager; 
import java.awt.event.ActionListener; 
import java.awt.event.ActionEvent; 
import java.awt.event.ComponentListener; 
import java.awt.event.ComponentEvent; 
import java.awt.event.KeyEvent; 
import java.util.Set; 
import java.util.HashSet; 
import javax.swing.JPanel; 
import javax.swing.JFrame; 
import javax.swing.JButton; 
import javax.swing.JOptionPane; 
import javax.swing.KeyStroke; 
import javax.swing.SwingUtilities; 

public class FocusFrame extends JFrame 
{ 
    JButton lowerButton; 
    JButton upperButton; 
    JPanel centerPanel; 

    public void prepareAndShowGUI() 
    { 
     centerPanel = new FocusPanel(); 
     lowerButton = new JButton("Lower Button"); 
     upperButton = new JButton("Click here to hide/show center Panel"); 
     Container container = getContentPane(); 
     container.add(centerPanel,BorderLayout.CENTER); 
     container.add(lowerButton,BorderLayout.SOUTH); 
     container.add(upperButton,BorderLayout.NORTH); 
     upperButton.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent evt) 
      { 
       centerPanel.setVisible(!centerPanel.isVisible()); 
      } 
     }); 
     pack(); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setVisible(true); 
    } 
    public static void main(String[] st) 
    { 
     SwingUtilities.invokeLater(new Runnable() 
     { 
      @Override 
      public void run() 
      { 
       FocusFrame fFrame = new FocusFrame(); 
       fFrame.prepareAndShowGUI(); 
      } 
     }); 
    } 
} 

class FocusPanel extends JPanel implements ComponentListener 
{ 
    int SIZE = 10; 
    JButton[] buttons; 
    public FocusPanel() 
    { 
     createAndAttachGUI(); 
    } 
    private void createAndAttachGUI() 
    { 
     buttons = new JButton[SIZE]; 
     setLayout(new GridLayout(5,5)); 
     for (int i = 0 ; i < SIZE ; i++) 
     { 
      buttons[i] = new JButton("Button " + (i+1)); 
      buttons[i].setFocusTraversalKeysEnabled(true); 
      add(buttons[i]); 
     } 
     //For Forward Focus Traversal 
     Set<AWTKeyStroke> set = new HashSet<AWTKeyStroke>(this.getFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS)); 
     set.add(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT,0)); 
     setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,set); 
     //For Backward Focus Traversal 
     set = new HashSet<AWTKeyStroke>(this.getFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS)); 
     set.add(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT,0)); 
     setFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS,set); 
     addComponentListener(this); 
    } 
    @Override 
    public void componentHidden(ComponentEvent e) 
    {} 
    @Override 
    public void componentMoved(ComponentEvent e) 
    { 
     buttons[0].requestFocus(); 
    } 
    @Override 
    public void componentResized(ComponentEvent e) 
    {} 
    @Override 
    public void componentShown(ComponentEvent e) 
    { 
     buttons[0].requestFocus(); 
    } 
}