private JCheckBox getEnableWallCollisionCheckBox() {
   if (enableWallCollisionCheckBox == null) {
     enableWallCollisionCheckBox = new JCheckBox("Wall Collisions");
     enableWallCollisionCheckBox.setMnemonic('l');
     enableWallCollisionCheckBox.setDisplayedMnemonicIndex(2);
   }
   return enableWallCollisionCheckBox;
 }
 private JCheckBox getEnableRobotDeathCheckBox() {
   if (enableRobotDeathCheckBox == null) {
     enableRobotDeathCheckBox = new JCheckBox("Robot Death Explosions");
     enableRobotDeathCheckBox.setMnemonic('x');
     enableRobotDeathCheckBox.setDisplayedMnemonicIndex(13);
   }
   return enableRobotDeathCheckBox;
 }
 private JCheckBox getEnableRobotCollisionCheckBox() {
   if (enableRobotCollisionCheckBox == null) {
     enableRobotCollisionCheckBox = new JCheckBox("Robot Collisions");
     enableRobotCollisionCheckBox.setMnemonic('t');
     enableRobotCollisionCheckBox.setDisplayedMnemonicIndex(4);
   }
   return enableRobotCollisionCheckBox;
 }
 private JCheckBox getEnableBulletHitCheckBox() {
   if (enableBulletHitCheckBox == null) {
     enableBulletHitCheckBox = new JCheckBox("Bullet Hit");
     enableBulletHitCheckBox.setMnemonic('H');
     enableBulletHitCheckBox.setDisplayedMnemonicIndex(7);
   }
   return enableBulletHitCheckBox;
 }