Box form = Box.createVerticalBox();
form.add( new JLabel("Any Number") );
form.add( new JTextField("5000") );
form.add( new JLabel("Only 0-100") );
JTextField rangeField = new JTextField("50");
rangeField.setInputVerifier( new InputVerifier() {
public boolean verify( JComponent comp ) {
JTextField field = (JTextField)comp;
boolean passed = false;
try {
int n = Integer.parseInt(field.getText());
passed = ( 0 <= n && n <= 100 );
} catch (NumberFormatException e) { }
if ( !passed ) {
comp.getToolkit().beep();
field.selectAll();
}
return passed;
}
} );
form.add( rangeField );
JFrame frame = new JFrame("User Information");
frame.getContentPane().add(form);
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.pack();
frame.setVisible(true);
