Articles on Java programming language.
This example has a fruits menu and a JLabel in the JFrame. The fruit menu contains four Radio button menu items and the user can pick only one among them. In the JLabel, the example displays what menu item is picked by the user. Now, let us create this example.
The example has a menu called fruits. When the user clicks the Fruits menu, they can see four Checkbox menu items along with Image Icons. At the bottom of the screen, there is a text field which reports all the checked check boxes. In the above picture, Banana & Cherry check boxes are checked and hence the text field shows Banana and Cherry in it. When the user clicks a menu item, a check mark appears in the check box, and it disappears when the user clicks it again.
Our example is a JFrame Window which can display a Context Menu. A context menu will appear at the click location of the mouse when user right clicks anywhere in the form except the title bar. The displayed menu will not have any title and it contains three menu items in it.
This example has a JMenuBar with two JMenu in it. The menus are File and Edit. File Menu has 4 MenuItems which include a JSeparator. This separator is separating Open, Save menu items with the Exit menu items. When you click Open MenuItem under the File Menu, a dialog will be displayed. This helps us to learn how to respond to the Menu Item click event. The Edit menu has 3 Menu Items. Now let us code this example.
Here, we will create two examples. One on the left, which makes use of Glue component and the one on the right uses the struts. In both the examples, we have three JPanels with BoxLayout. Two JPanels use Vertical BoxLayout and one JPanel in the Frame’s top uses horizontal BoxLayout. The JPanel contents are below:
1) Right Panel: Button1, Button2, Button3
2) Left Panel: Button7, Button8, Button9
3) Top Panel: Button4, Button5, Button6
With these two examples, we can study how the Struts and Glues behave when the containing container resizes. Note, to study the resizing of Glues and Struts, we will use the edges of the BorderLayout.