JCheckBox checkBox = new JCheckBox("Check me"); checkBox.setSelected(true);
JCheckBox checkBox = new JCheckBox("Check me"); checkBox.setSelected(true); if (checkBox.isSelected()) { System.out.println("Checkbox is selected"); } else { System.out.println("Checkbox is not selected"); }This code creates a new JCheckBox with the label "Check me" and sets it to be selected. It then checks if the checkbox is selected using the isSelected() method and prints a message to the console accordingly. The package library used in these examples is javax.swing.