Java tutorial
import java.awt.FlowLayout; import javax.swing.JCheckBox; import javax.swing.JFrame; public class Main extends JFrame { public Main() { setSize(300, 300); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLayout(new FlowLayout(FlowLayout.LEFT)); JCheckBox checkBox = new JCheckBox("Check me!"); checkBox.setSelected(true); boolean selected = checkBox.isSelected(); if (selected) { System.out.println("Check box state is selected."); } else { System.out.println("Check box state is not selected."); } getContentPane().add(checkBox); } public static void main(String[] args) { new Main().setVisible(true); } }