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    <p>Try this one</p> <pre><code> package javaapplication7; import java.awt.FlowLayout; import java.awt.event.FocusAdapter; import java.awt.event.FocusEvent; import javax.swing.JFrame; import javax.swing.JTextField; import javax.swing.text.JTextComponent; public class testfocuss { public static void main(String[] argv) throws Exception { JTextField component = new JTextField(20); JTextField component1 = new JTextField(20); JTextField component2 = new JTextField(20); JTextField component3 = new JTextField(20); MyFocusListener l = new MyFocusListener(); component.addFocusListener(l); component1.addFocusListener(l); component2.addFocusListener(l); component3.addFocusListener(l); JFrame f = new JFrame(); f.setLayout(new FlowLayout()); f.add(component1); f.add(component); f.add(component2); f.add(component3); f.pack(); f.setVisible(true); } } class MyFocusListener&lt;C extends JTextComponent&gt; extends FocusAdapter { // boolean showingDialog = false; public void focusGained(FocusEvent evt) { final C c = (C) evt.getSource(); String s = c.getText(); c.requestFocus(); c.selectAll(); for (int i = 0; i &lt; s.length(); i++) { if (!Character.isDigit(s.charAt(i))) { c.setSelectionStart(i); c.setSelectionEnd(i); break; } } } public void focusLost(FocusEvent evt) { final C c = (C) evt.getSource(); String s = c.getText(); if (evt.isTemporary()) { return; } for (int i = 0; i &lt; s.length(); i++) { if (!Character.isDigit(s.charAt(i))) { // System.out.println("must only contain digits"); c.requestFocus(); c.selectAll(); break; } } } } </code></pre> <p>Notice: Your listener is cappable to use multiple times.</p>
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    1. POCreate generic class for java program
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    1. USPeter Rader
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      1. VTUpMod
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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