Focus when Mouse Hover in Java

[TRAPPIN]

This tutorial will teach you how to create a program that when hovering a mouse it will focus on the button using java.

So, now let's start this tutorial!

1. Open JCreator or NetBeans and make a java program with a file name of focusSample.java.

2. Import the following package library:

1. import
   
   java.awt.*
   
   ;
   
   //used to access a Component and GridLayout class
   
2. import
   
   java.awt.event.*
   
   ;
   
   //used to access MouseAdapter,MouseEvent, and MouseListener class
   
3. import
   
   javax.swing.*
   
   ;
   
   //used to access JButton and JFrame class
   

3. Create a class name MouseHover that will extend a MouseAdapter to access a component so that it can request focus. We will use the JComponent class so that it will call the component to be focused.

1. class
   
   MouseHover extends
   
   MouseAdapter
   
   {
   
2. public
   
   void
   
   mouseEntered(
   
   MouseEvent
   
   mouseEvent)
   
   {
   
3. Component
   
   component =
   
   mouseEvent.getComponent
   
   (
   
   )
   
   ;
   
4. if
   
   (
   
   !
   
   component.hasFocus
   
   (
   
   )
   
   )
   
   {
   
5. component.requestFocusInWindow
   
   (
   
   )
   
   ;
   
6. }
   
7. }
   
8. }
   

4. We will initialize variables in our Main, variable frame as JFrame, and mouseListener as the MouseHover class that we have declared above.

1. JFrame
   
   frame =
   
   new
   
   JFrame
   
   (
   
   "Focus Sample"
   
   )
   
   ;
   
2. MouseListener
   
   mouseListener =
   
   new
   
   MouseHover(
   
   )
   
   ;
   

Now, we will create 6 buttons and will apply the Focus that we have declared the MouseHover class. We will use the setFocusable method of the buttons so that it can be focused.

1. for
   
   (
   
   int
   
   i =
   
   1
   
   ;
   
   i <=
   
   6
   
   ;
   
   i++
   
   )
   
   {
   
2. JButton
   
   button =
   
   new
   
   JButton
   
   (
   
   Integer
   
   .toString
   
   (
   
   i)
   
   )
   
   ;
   
3. button.addMouseListener
   
   (
   
   mouseListener)
   
   ;
   
4. button.setFocusable
   
   (
   
   true
   
   )
   
   ;
   
5. frame.getContentPane
   
   (
   
   )
   
   .add
   
   (
   
   button)
   
   ;
   
6. }
   

5. Lastly, set the size and visibility to true, and close its operation. Have this code below:

1. frame.setDefaultCloseOperation
   
   (
   
   JFrame
   
   .EXIT_ON_CLOSE
   
   )
   
   ;
   
2. frame.getContentPane
   
   (
   
   )
   
   .setLayout
   
   (
   
   new
   
   GridLayout
   
   (
   
   2
   
   , 3
   
   )
   
   )
   
   ;
   
3. frame.setSize
   
   (
   
   300
   
   , 200
   
   )
   
   ;
   
4. frame.setVisible
   
   (
   
   true
   
   )
   
   ;
   

Output:

Here's the full code of this tutorial:

1. import
   
   java.awt.*
   
   ;
   
   //used to access a Component and GridLayout class
   
2. import
   
   java.awt.event.*
   
   ;
   
   //used to access MouseAdapter,MouseEvent, and MouseListener class
   
3. import
   
   javax.swing.*
   
   ;
   
   //used to access JButton and JFrame class
   
4. 
   
5. 
   
6. class
   
   MouseHover extends
   
   MouseAdapter
   
   {
   
7. public
   
   void
   
   mouseEntered(
   
   MouseEvent
   
   mouseEvent)
   
   {
   
8. Component
   
   component =
   
   mouseEvent.getComponent
   
   (
   
   )
   
   ;
   
9. if
   
   (
   
   !
   
   component.hasFocus
   
   (
   
   )
   
   )
   
   {
   
10. component.requestFocusInWindow
    
    (
    
    )
    
    ;
    
11. }
    
12. }
    
13. }
    
14. public
    
    class
    
    focusSample{
    
15. public
    
    static
    
    void
    
    main(
    
    String
    
    args[
    
    ]
    
    )
    
    {
    
16. JFrame
    
    frame =
    
    new
    
    JFrame
    
    (
    
    "Focus Sample"
    
    )
    
    ;
    
17. MouseListener
    
    mouseListener =
    
    new
    
    MouseHover(
    
    )
    
    ;
    
18. 
    
19. for
    
    (
    
    int
    
    i =
    
    1
    
    ;
    
    i <=
    
    6
    
    ;
    
    i++
    
    )
    
    {
    
20. JButton
    
    button =
    
    new
    
    JButton
    
    (
    
    Integer
    
    .toString
    
    (
    
    i)
    
    )
    
    ;
    
21. button.addMouseListener
    
    (
    
    mouseListener)
    
    ;
    
22. button.setFocusable
    
    (
    
    true
    
    )
    
    ;
    
23. frame.getContentPane
    
    (
    
    )
    
    .add
    
    (
    
    button)
    
    ;
    
24. }
    
25. 
    
26. 
    
27. frame.setDefaultCloseOperation
    
    (
    
    JFrame
    
    .EXIT_ON_CLOSE
    
    )
    
    ;
    
28. frame.getContentPane
    
    (
    
    )
    
    .setLayout
    
    (
    
    new
    
    GridLayout
    
    (
    
    2
    
    , 3
    
    )
    
    )
    
    ;
    
29. frame.setSize
    
    (
    
    300
    
    , 200
    
    )
    
    ;
    
30. frame.setVisible
    
    (
    
    true
    
    )
    
    ;
    
31. }
    
32. }
    

For more inquiries and need programmer for your thesis systems in any kind of programming languages, just contact my number below.

Best Regards,

Engr. Lyndon Bermoy
IT Instructor/System Developer/Android Developer/Freelance Programmer
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E-mail:[email protected]

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