Java from getting started to mastering 15-directional key control ball instances

Read the code as the main:

Importjavax.swing.*;Importjava.awt.*;Importjava.awt.event.KeyEvent;ImportJava.awt.event.KeyListener;/*** Created by Administrator on 2015-10-15.*/ Public classArrawkeyextendsJFrame {circlepanel Circlepanel=NULL;  Public Static voidMain (string[] args) {Arrawkey Arrawkey=NewArrawkey (); }    //constructor Function     PublicArrawkey () {Circlepanel=NewCirclepanel ();  This. Add (Circlepanel);  This. Addkeylistener (Circlepanel);  This. SetSize (640, 480);  This. Settitle ("Key Control Ball Instance");  This. Setlocationrelativeto (NULL);  This. Setdefaultcloseoperation (Jframe.exit_on_close);  This. setvisible (true); }}//Define panelclassCirclepanelextendsJPanelImplementsKeyListener {intx = 10; inty = 10;  Public voidPaint (Graphics graphics) {Super. Paint (graphics); Graphics.filloval (x, Y,10, 10); } @Override Public voidkeytyped (KeyEvent e) {} @Override Public voidkeypressed (KeyEvent e) {Switch(E.getkeycode ()) { Casekeyevent.vk_down:y+ = 10;  Break;  Casekeyevent.vk_up:y-= 10;  Break;  Casekeyevent.vk_right:x+ = 10;  Break;  Casekeyevent.vk_left:x-= 10;  Break; }         This. repaint (); } @Override Public voidkeyreleased (KeyEvent e) {}}

Java from getting started to mastering 15-directional key control ball instances