java多线程

2019-11-08 01:17:53

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线程与进程最主要的区别是每个进程都拥有自己的一整套变量，而线程则是共享数据的。interrupted方法是检测当前的线程是否被中断，并且调用该方法会清除该线程的中断状态。isInterrupted用来检验是否有线程被中断。调用这个方法不会改变中断状态。 3. import java.awt.geom.*;public class Ball { PRivate static final int XSIZE = 15; private static final int YSIZE = 15; private double x = 0; private double y = 0; private double dx = 1; private double dy = 1; public void move(Rectangle2D bounds) { x += dx; y += dy; if (x < bounds.getMinX()) { x = bounds.getMaxX(); dx = -dx; } if (x + XSIZE >= bounds.getMaxX()) { x = bounds.getMaxX() - XSIZE; dx = -dx; } if (y < bounds.getMinY()) { y = bounds.getMaxY(); dy = -dy; } if (y + YSIZE >= bounds.getMaxY()) { y = bounds.getMaxY() - YSIZE; dy = -dy; } } public Ellipse2D getShape() { return new Ellipse2D.Double(x, y, XSIZE, YSIZE); //new Ellipse2D.Double(x, y, XSIZE, YSIZE); }}import java.awt.Dimension;import java.awt.Graphics;import java.awt.Graphics2D;import java.util.ArrayList;import java.util.List;import javax.swing.JPanel;public class BallComponent extends JPanel { /** * */ private static final long serialVersionUID = 2629028133593727544L; private static final int DEFAULT_WIDTH = 450; private static final int DEFAULT_HIGHT = 350; private List<Ball> balls = new ArrayList<>(); public BallComponent() { this.setPreferredSize(getPreferredSize()); } public void add(Ball b) { balls.add(b); } @Override protected void paintComponent(Graphics g) { // TODO Auto-generated method stub super.paintComponent(g); Graphics2D g2 = (Graphics2D) g; for (Ball b : balls) { g2.fill(b.getShape()); } } public Dimension getPreferredSize() { return new Dimension(DEFAULT_WIDTH, DEFAULT_HIGHT); }}

实现Runnable方法。

import java.awt.Component;public class BallRundable implements Runnable { private Ball ball; private Component component; public static final int STEPS = 1000; public static final int DELAY =3; public BallRundable(Ball ball, Component component) { this.ball = ball; this.component = component; } @Override public void run() { try { for (int i = 1; i <= STEPS; i++) { ball.move(component.getBounds()); component.repaint(); Thread.sleep(DELAY); } } catch (Exception e) { e.printStackTrace(); } }}import java.awt.EventQueue;import javax.swing.JFrame;public class BonuceThread { public static void main(String[] args) { EventQueue.invokeLater(new Runnable(){ @Override public void run() { JFrame frame = new BounceFrame(); frame.setTitle("BonuceThread"); frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } }); }}import java.awt.BorderLayout;import java.awt.Container;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;public class BounceFrame extends JFrame { /** * */ private static final long serialVersionUID = -1202234496448237858L; private BallComponent comp; public BounceFrame() { this.setTitle("Bounce"); comp = new BallComponent(); add(comp, BorderLayout.CENTER); JPanel buttonPanel = new JPanel(); addButton(buttonPanel, "start", new ActionListener() { @Override public void actionPerformed(ActionEvent e) { addBall(); } }); addButton(buttonPanel, "Close", new ActionListener() { @Override public void actionPerformed(ActionEvent e) { System.exit(0); } }); add(buttonPanel, BorderLayout.SOUTH); pack(); } public void addButton(Container c, String title, ActionListener listener) { JButton button = new JButton(title); c.add(button); button.addActionListener(listener); } public void addBall() { try { Ball ball = new Ball(); comp.add(ball); //多线程调用。 Runnable r = new BallRundable(ball, comp); Thread t = new Thread(r); t.start(); } catch (Exception e) { e.printStackTrace(); } }}

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