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1.2. Creating windowed programs and, Applets., Working with Frame Windows:, After the applet, the type of window we will most often, , create is derived from Frame., We will use it to create child windows within applets, and, , top-level or child windows for applications., It creates a standard-style window., , Prof. Ghanawajeer D.J.
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1.2. Creating windowed programs and, Applets., ❖ Frame’s Constructors:, , Frame( ) – It creates a standard window that does not, , contain a title., Frame(String title)- It creates a window with the title, , specified by title., Note that we cannot specify the dimensions of the window., Instead, we must set the size of the window after it has been, created., Prof. Ghanawajeer D.J.
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1.2. Creating windowed programs and, Applets., ❖, , Setting the Windows Dimensions:, , The setSize( ) method is used to set the dimensions of the, , window., void setSize(int newWidth, int newHeight), , , void setSize(Dimension newSize), , The new size of the window is specified by ‘newWidth’ and, , ‘newHeight’, or by the ‘width’ and ‘height’ fields of the, Dimension object passed in ‘newSize’., Prof. Ghanawajeer D.J.
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1.2. Creating windowed programs and, Applets., ❖ Setting the Windows Dimensions:, The dimensions are specified in terms of pixels. The getSize( ), , method is used to obtain the current size of a window., , , Dimension getSize( ), , This method returns the current size of the window contained, , within the ‘width’ and ‘height’ fields of a Dimension object., , Prof. Ghanawajeer D.J.
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1.2. Creating windowed programs and, Applets., ❖ Hiding and showing a Window:, After a frame window has been created, it will not be visible, , until we call setVisible( )., void, , setVisible(boolean visibleFlag), , The component is visible if the argument to this method is, , true. Otherwise, it is hidden., , Prof. Ghanawajeer D.J.
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1.2. Creating windowed programs and, Applets., ❖ Setting a Windows Title:, We can change the title in a frame window using setTitle( )., void, , setTitle(String newTitle), , Here, ‘newTitle’ is the new title for the window., , Prof. Ghanawajeer D.J.
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1.2. Creating windowed programs and, Applets., ❖ Closing a Frame Window:, When using a frame window, our program must remove that, , window from the screen when it is closed, by calling, , setVisible(false)., To intercept a window-close event, we must implement the, , windowClosing() method of the WindowListener interface., Inside windowClosing( ), we must remove the window from the, screen., Prof. Ghanawajeer D.J.
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1.2. Creating windowed programs and, Applets., Creating a Windowed Program:, Although creating applets is the most common use for Java’s, , AWT, it is possible to create stand-alone AWT-based applications,, , too., To do this, simply create an instance of the window or windows, , we need inside main( )., , Prof. Ghanawajeer D.J.
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1.2. Creating windowed programs and, Applets., Creating a Windowed Program:, , Example, , Prof. Ghanawajeer D.J.
