Codigo:

private void jCheckBox1ActionPerformed(java.awt.event.ActionEvent evt) {                                           
        // TODO add your handling code here:    
        if jCheckBox1.setEnabled(true)
        {
           jComboBox2.setEnabled(true);
        }
        else
        {
           jComboBox2.setEnabled(false);
        }
    }                              



Error:

init:
deps-jar:
Compiling 1 source file to /home/on3g/Desktop/Trabajo Final/FullSport/build/classes
/home/on3g/Desktop/Trabajo Final/FullSport/src/fullsport/ReservaFrm.java:217: '(' expected
        if jCheckBox1.setEnabled(true)
/home/on3g/Desktop/Trabajo Final/FullSport/src/fullsport/ReservaFrm.java:217: ')' expected
        if jCheckBox1.setEnabled(true)
2 errors
BUILD FAILED (total time: 0 seconds)