Graphical User Interface (I) GUI Elements

Creating a GUI program in Java requires at least three types of objects:

* Component

* Events

* Listener

Pushcounter is a startup class and only displays a button (marked as "Push me !"), Press the button to update the counter to display the latest results.

// Pushcounter. Java
// Demonstrate a graphical user interface and listener

Import javax. Swing. jframe;

Public class pushcounter {

// Create a presentation framework
Public static void main (string [] ARGs ){

Jframe frame = new jframe ("Push counter ");
Frame. setdefaclocloseoperation (jframe. exit_on_close );

Pushcounterpanel Panel = new pushcounterpanel ();
Frame. getcontentpane (). Add (panel );

// The pack method is used to set the frame size according to the content in the frame.
Frame. Pack ();
Frame. setvisible (true );
}
}

 

// Pushcounterpanel. Java

Import java. AWT. color;
Import java. AWT. dimension;
Import java. AWT. event. actionevent;
Import java. AWT. event. actionlistener;

Import javax. Swing. jbutton;
Import javax. Swing. jlabel;
Import javax. Swing. jpanel;

Public class pushcounterpanel extends jpanel {
Private int count;
Private jbutton push;
Private jlabel label;
 
Public pushcounterpanel (){
Count = 0;

Push = new jbutton ("push me! ");
Push. addactionlistener (New buttonlistener ());

Label = new jlabel ("pushes:" + count );

Add (push );
Add (Label );

Setbackground (color. Cyan );
Setpreferredsize (new dimension (300, 40 ));
}
 
// Update the tag when the button is pressed.

Private class buttonlistener implements actionlistener {

 
Public void actionreceivmed (actionevent arg0 ){
Count ++;
Label. settext ("pushes:" + count );
}

}
}

Components used in this program include: a button, a tag for displaying the count, a panel for holding the buttons and labels, and a frame for displaying the panel.

Jframe is like a building, a panel is like a room, and things are placed in the room

Graphical things have a special attraction. After all, they are real things that can be seen.