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BorderLayout is default layout manager for the content pane It implements a layout style that defines five locations to which a component can be added The first is the center The other four are the sides (ie, borders), which are called north, south, east, and west By default, when you add a component to the content pane, you are adding the component to the center To add a component to one of the other regions, specify its name Although a border layout is useful is some situations, often another, more flexible layout manager is needed One of the simplest is FlowLayout A flow layout lays out components one row at a time, top to bottom When one row is full, layout advances to the next row Although this scheme gives you little control over the placement of components, it is quite simple to use However, be aware that if you resize the frame, the position of the components will change Because of its simplicity, flow layout is used by several of the examples GridLayout creates a grid of rectangular cells into which individual components are placed The size of each cell in the grid is the same, and a component put into a cell is sized to fill the dimensions of the cell The grid dimensions are specified when you create an instance of GridLayout For example, this expression
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new GridLayout(5, 2)
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creates a grid that has 5 rows and 2 columns BoxLayout gives you an easy way to create groups of components that are organized into boxes Usually, you won t use BoxLayout as the layout manager for the content pane itself Instead, you will normally create one or more panels that use BoxLayout, add components to the panels, and then add the panels to the content pane In this way, you can easily create groups of components that lay out as a unit Although you can implement this approach manually (by using JPanel), Swing offers a more convenient approach The Box class can be used to create a container that automatically uses BoxLayout This approach is used by one of the examples
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Another important part of most Swing programs is event handling Most Swing components respond to user input, and the events generated by those interactions need to be handled For example, an event is generated when the user clicks on a button, types a key on the keyboard, or selects an item from a list Events are also generated in ways not directly related to user input For example, an event is generated when a timer goes off Whatever the case, event handling is a large part of any program that uses Swing The event-handling mechanism used by Swing is called the delegation event model Its concept is quite simple A source generates an event and sends it to one or more listeners In this scheme, the listener simply waits until it receives an event Once an event arrives, the listener processes the event and then returns The advantage of this design is that the application logic that processes events is cleanly separated from the user interface logic that generates the events A user interface element is able to delegate the processing of an event to a separate piece of code In the delegation event model, a listener must register with a source in order to receive an event notification
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In the delegation model, an event is an object that describes a state change in a source It can be generated as a consequence of a person interacting with an element in a graphical user interface or it can be generated under program control The superclass for all events is javautilEventObject Many events are declared in javaawtevent These are the events defined by the AWT Although Swing uses these events, it also defines several of its own These are found in javaxswingevent
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