How to display text in JFrame using Netbeans? How to clear text in a JFrame?

开发者_运维问答How can I display text in JFrame using Netbeans? And how to clear text in JFrame?

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to create a label for text:

JLabel label1 = new JLabel("your text here");

to change the text in the label:

label1.setText("your new text here");

and finally to clear the label:

label1.setText("");

and all you have to to is place the label in your layout, or what ever layout system you are using, and then just add it to the JFrame..

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you can use this

@Override
public void paintComponents(Graphics g) {
    super.paintComponents(g);
    g.drawString("Hello", 0, 0);
}

or use jTextField

 jTextField1.setText("Hello");

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You can use JLabel to display text, and you can reset by setting its text to "" . check doc

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If you're using the Netbeans GUI builder then there's a good beginner's tutorial. Otherwise, if you're coding manually, there's a good guide to Swing on Oracle's site: http://download.oracle.com/javase/tutorial/uiswing/TOC.html

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You can create Jlabel.

JLabel l1=new JLabel("Your text");

l1.setText(""); // clear the text

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Check Properties.Under the Swing Control you will find the JLabel.Drag & DROP it in your JFRAME.

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This code works with Netbeans.. create one new Frame and set Text for you in the middle of the Frame..

public class NewJFrame extends javax.swing.JFrame {

public NewJFrame() {
    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() {

    jLabel1 = new javax.swing.JLabel();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jLabel1.setText("Label For The JFrame");

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(107, 107, 107)
            .addComponent(jLabel1)
            .addContainerGap(141, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(88, 88, 88)
            .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(187, Short.MAX_VALUE))
    );

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

/**
 * @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.JLabel jLabel1;
// End of variables declaration

}

Replace This jLabel1.setText("Label For The JFrame"); with your customized Label in Code.

and when you want to blank the Label use jLabel1.setText("");

Thanks..