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/** * @(#)CheckBoxTest.java//from www . j ava 2 s .c o m * * * @author * @version 1.00 2014/7/14 */ import java.awt.*; import java.awt.event.*; import javax.swing.*; public class CheckBoxTest extends JFrame { private JTextField field1; private JCheckBox bold, italic; //set GUI public CheckBoxTest() { super ("JCheckBox Test"); //get content pane Container container = getContentPane(); container.setLayout( new FlowLayout() ); //set up JTextField field1 = new JTextField("Hohohoho", 20); field1.setFont( new Font("Serif", Font.PLAIN, 14)); container.add(field1); //create checkbox objects bold = new JCheckBox ("Bold"); container.add( bold); italic = new JCheckBox ("Italic"); container.add( italic); //register listenenr CheckBoxHandler handler = new CheckBoxHandler(); bold.addItemListener( handler); italic.addItemListener( handler); setSize( 275, 100); setVisible (true); } public static void main (String[] args) { CheckBoxTest app = new CheckBoxTest(); app.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE); } //private inner class private class CheckBoxHandler implements ItemListener { private int valBold = Font.PLAIN; private int valItalic = Font.PLAIN; public void itemStateChanged( ItemEvent event) { if ( event.getSource() == bold ) valBold = bold.isSelected() ? Font.BOLD : Font.PLAIN; if ( event.getSource() == bold ) valItalic = italic.isSelected() ? Font.ITALIC : Font.PLAIN; //set text field field1.setFont( new Font( "Serif", valBold + valItalic, 14) ); } } }