辅以图示简述Java线程的生命周期

发布网友 发布时间：2022-04-20 21:44

我来回答

共2个回答

热心网友 时间：2023-07-18 05:04

//这是线程被中断，同生命周期的代码，希望帮到你啦！
class MyThread implements Runnable {
@Override
public void run() {
System.out.println("1、进入run()方法休眠");
try {
System.out.println("2、线程休眠20秒");
Thread.sleep(20000);//这里休眠20秒
System.out.println("3、线程正常休眠完毕");
} catch (InterruptedException e) {
System.out.println("4、线程发生异常休眠被中断");
return;//返回方法调用处
}
System.out.println("5、线程正常结束run()方法体");
}
}
public class InterruptDemo {

public static void main(String[] args) {
MyThread mt = new MyThread();
Thread t = new Thread(mt,"线程A");
t.start();//启动线程
//========================================================
try {
Thread.sleep(2000); //保证线程至少执行2秒
} catch (InterruptedException e) {
e.printStackTrace();
}
//========================================================
t.interrupt();//中断线程
}
}

热心网友 时间：2023-07-18 05:04

不知道你的怪物长什么样子，用个点来模仿一下。

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;

public class BounceThread {
public static void main(String[] args) {
JFrame frame = new BounceFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}

class BallRunnable implements Runnable {
public BallRunnable(Ball aBall, Component aComponent) {
ball = aBall;
component = aComponent;
}

public void run() {
try {
for(int i=1;i<=STEPS;i++) {
ball.move(component.getBounds());
component.repaint();
Thread.sleep(DELAY);
}
} catch(InterruptedException e) {
e.printStackTrace();
}
}

private Ball ball;
private Component component;
public static final int STEPS = 1000;
public static final int DELAY = 5;
}

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.getMinX();
dx = -dx;
}
if(x+XSIZE>=bounds.getMaxX()) {
x = bounds.getMaxX()-XSIZE;
dx =-dx;
}
if(y<bounds.getMinY()) {
y = bounds.getMinY();
dy = -dy;
}
if(y+YSIZE>=bounds.getMaxY()) {
y = bounds.getMaxY()-YSIZE;
dy = -dy;
}
}

public Ellipse2D getShape() {
return new Ellipse2D.Double(x, y, XSIZE, YSIZE);
}

}

class BallPanel extends JPanel {
public void add(Ball b) {
balls.add(b);
}

public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 =(Graphics2D)g;
for(Ball b : balls) {
g2.fill(b.getShape());
}
}
private ArrayList<Ball>balls = new ArrayList<Ball>();
}

class BounceFrame extends JFrame {

private BallPanel panel;
public static final int STEPS = 1000;
public static final int DELAY = 3;

public BounceFrame() {
setSize(450,350);
setTitle("Bounce");

panel = new BallPanel();
add(panel, BorderLayout.CENTER);
JPanel buttonPanel = new JPanel();
addButton(buttonPanel, "Start", new ActionListener() {
public void actionPerformed(ActionEvent event) {
addBall();
}
});

addButton(buttonPanel, "Close", new ActionListener() {
public void actionPerformed(ActionEvent event) {
System.exit(0);
}
});
add(buttonPanel, BorderLayout.SOUTH);
}

public void addButton(Container c, String title, ActionListener listener) {
JButton button = new JButton(title);
c.add(button);
button.addActionListener(listener);
}

public void addBall() {
Ball ball = new Ball();
panel.add(ball);

Runnable r = new BallRunnable(ball, panel);
Thread t = new Thread(r);
t.start();
}

}