JAVA开发的媒体播放器.rar

import javax.swing.Timer; import javax.swing.*; import java.awt.*; import java.awt.Color; import java.awt.event.*; public class Exercise14_2 extends JApplet { private JScrollBar jsbDelay = new JScrollBar(); private JButton jbStart =new JButton("Start"); private JButton jbStop=new JButton("Stop"); private JButton jbReverse=new JButton("Reverse"); public Exercise14_2() { JPanel jp1=new JPanel(); jp1.setLayout(new GridLayout(1,3)); jp1.add(jbStart); jp1.add(jbStop); jp1.add(jbReverse); add(jp1,BorderLayout.NORTH); jsbDelay.setOrientation(JScrollBar.HORIZONTAL); add(jsbDelay,BorderLayout.SOUTH); add(new Fans(),BorderLayout.CENTER); } class Fans extends JPanel{ int X=0; private int delay = 10; //时间间隔 private int Direction; //设定方向 protected Timer timer = new Timer(delay, new TimerListener()); public Fans (){ jbStart.addActionListener(new ActionListener(){ //开始 public void actionPerformed(ActionEvent e){ setDirection(20); //顺时针转动 timer.start(); } }); jbStop.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ timer.stop(); } }); jbReverse.addActionListener(new ActionListener(){ //反转 public void actionPerformed(ActionEvent e){ setDirection(-20); //逆时针转动 timer.start(); } }); jsbDelay.addAdjustmentListener(new AdjustmentListener() { public void adjustmentValueChanged(AdjustmentEvent e) { setDelay(jsbDelay.getMaximum() - e.getValue()); //从左到右速度增大 } }); } public void setDelay(int delay) { //设置时间间隔 this.delay = delay; timer.setDelay(delay); } public void setDirection(int Direction){ //设置转动的方向 this.Direction=Direction; } class TimerListener implements ActionListener { public void actionPerformed(ActionEvent e) { repaint(); } } public void paintComponent(Graphics g) { super.paintComponent(g); int xCenter = getWidth() / 2; int yCenter = getHeight() / 2; int radius =(int)(Math.min(getWidth(), getHeight()) * 0.4); int x = xCenter - radius; int y = yCenter - radius; g.drawOval(x-10, y-10, 2 * radius+20, 2 * radius+20); X-=Direction; g.setColor(Color.red); g.fillArc(x, y, 2 * radius, 2 * radius, X, 30); g.setColor(Color.green); g.fillArc(x, y, 2 * radius, 2 * radius, 90+X, 30); g.setColor(Color.blue); g.fillArc(x, y, 2 * radius, 2 * radius, 180+X, 30); g.setColor(Color.yellow); g.fillArc(x, y, 2 * radius, 2 * radius, 270+X, 30); } } public static void main(String[] args) { Exercise14_2 applet =new Exercise14_2(); JFrame frame = new JFrame(); frame.setTitle("Exercise14_2"); frame.add(applet); frame.setLocationRelativeTo(null); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(300, 300); frame.setVisible(true); } }