ButtonModel.setSelected(boolean b) has the following syntax.
void setSelected(boolean b)
In the following code shows how to use ButtonModel.setSelected(boolean b) method.
/*from www . j a va2s . c o m*/ import java.awt.BorderLayout; import javax.swing.JCheckBox; import javax.swing.JFrame; public class Main { public static void main(String[] a) { JFrame frame = new JFrame("Selecting CheckBox"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JCheckBox checkBox = new JCheckBox("Hi"); checkBox.getModel().setSelected(true); frame.add(checkBox, BorderLayout.NORTH); frame.setSize(300, 100); frame.setVisible(true); } }