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By James W. Cooper

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Creating Singleton Using a Static Method Another approach, suggested by Design Patterns, is to create Singletons using a static method to issue and keep track of instances. To prevent instantiating the class more than once, we make the constructor private so an instance can only be created from within the static method of the class. class iSpooler { //this is a prototype for a printer-spooler class //such that only one instance can ever exist static boolean instance_flag = false; //true if 1 instance //the constructor is privatized//but need not have any content private iSpooler() { } //static Instance method returns one instance or null static public iSpooler Instance() { if (!

The ButtonGroup object thus keeps track of the state of all the radio buttons in the group to enforce this only-one-on protocol. This is a clear example of the Mediator pattern we’ll be discussing in the chapters ahead. The JToolBar JToolBar is a container bar for tool buttons of the type you see in many programs. Normally, the JDK documentation recommends that you add the JToolBar as the only component on one side of a Borderlayout typically the North side), and that you not add components to the other 3 sides.

JToggleButton is a button that can be switched between two states by clicking, but which stays in that new state (up or down) like a 2-state check box does. Further the JToggleButton can take on the exclusive aspects of a radio button by adding it to a ButtonGroup. add(Flat); If you neglect to add the radio buttons to a ButtonGroup, you can have several of them turned on at once. It is he ButtonGroup that assures that only one at a time can be turned on. The ButtonGroup object thus keeps track of the state of all the radio buttons in the group to enforce this only-one-on protocol.

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