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Questions and Answers
What is the main purpose of the GridLayout in the provided code?
What is the main purpose of the GridLayout in the provided code?
- To manage window events.
- To display images in a sequence.
- To organize components in a grid structure. (correct)
- To create a single-column layout.
The GridLayoutDemo class extends the JFrame to create a window interface.
The GridLayoutDemo class extends the JFrame to create a window interface.
True (A)
What method is used to handle button events within the GridLayoutDemo class?
What method is used to handle button events within the GridLayoutDemo class?
actionPerformed
In the GridLayoutDemo class, the toggle variable is used to switch between two layouts, i.e., _____ and _____ layouts.
In the GridLayoutDemo class, the toggle variable is used to switch between two layouts, i.e., _____ and _____ layouts.
Match the following components with their descriptions:
Match the following components with their descriptions:
Which of the following is NOT considered an action key?
Which of the following is NOT considered an action key?
Modifier keys pressed are involved in determining the actions of other keys.
Modifier keys pressed are involved in determining the actions of other keys.
What is the purpose of 'event.getKeyModifiersText(event.getModifiers())' in programming?
What is the purpose of 'event.getKeyModifiersText(event.getModifiers())' in programming?
The modifier keys include Shift, Ctrl, and _____ .
The modifier keys include Shift, Ctrl, and _____ .
Match the following keys with their function:
Match the following keys with their function:
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Study Notes
GridLayoutDemo
- The
GridLayoutDemoclass implements theActionListenerinterface, usesjava.awtpackage for graphics,javax.swingfor JFrame display andjava.awt.eventto handle GUI events. - The
GridLayoutDemoclass usesGridLayoutto organize components within a frame grid1is created with 2 rows, 3 columns, and a 5-pixel gap between components horizontally and vertically.grid2has 3 rows and 2 columns.- The
actionPerformed()method toggles the layout of thecontainerbetweengrid1andgrid2when a button is clicked. toggleis a boolean variable used to control the layout change.
Panels
- Panels help organize components in a GUI.
- The
JPanelclass is a subclass ofJComponent. - Panels can hold other components, including other panels.
PanelDemo
- The
PanelDemoclass displays five buttons using aJPanel. - The
buttonPanelis created and its layout is set toGridLayoutwith 1 row and the number of buttons as columns. - The program creates and adds buttons to the
buttonPanel. - The
buttonPanelis added to thecontainerusingBorderLayout.SOUTH.
Layout Managers
- Layout managers are used to arrange GUI components within a container.
setLayout()method is used to specify the layout manager for a container.FlowLayoutis the default layout manager forApplet,Panel, andJPanel, placing components sequentially from left to right.
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