Buttons:
However, we have repeated it here for completeness so that you have all of the information on the visual components in one place. A button is normally used in an interface to signify that some form of processing will occur. Like every other Java element, it is an object and is defined by a class within Swing. To create an unlabelled or labelled button you need to use new. For example, the statement:
JButton offButton = new JButton( );
creates an unlabelled JButton, and:
JButton onButton = new JButton("Cancel");
creates a JButton with the label given by the constructor's argument.
An important point to make at this point is that the code above has not yet displayed the button on screen. It has just created a button object. The next section will show you how to display visual components. If you want to change the label on a button then you invoke the setText method of a button. For example:
offButton.setText("Press Me");
associates the label "Press Me" with the button offButton. To find the label associated with a button use the getText method. Thus:
String offButtonLabel = offButton.getText( );
sets the string variable offButtonLabel to "Press Me".
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