求解JAVA编程题:编写一个应用程序,创建三个线程分别显示各自的运行时间
public class AThread extends Thread {
private String name;
public AThread(String name) {
this.name = name;
}
public void run() {
long startTime = System.currentMillis();
System.out.println(name + " start at : " + startTime);
Thread.sleep(1000);
System.out.println(name + " totoal cost : " + (System.currentMillis() - startTime));
}
}
public class Test {
public static void main(String[] args) {
for (int i = 0; i < 3; i++) {
AThread t = new AThread("thread " + i);
t.start();
}
}
}
代码。
觉得好就加到100分吧。呵呵
_-----------------------------------------------
import java.awt.Color;
import javax.swing.JButton;
import javax.swing.JFrame;
public class AppDemo extends JFrame implements Runnable {
private int index = 1;
private JButton btnFirst = null;
private JButton btnSecond = null;
private JButton btnThird = null;
public AppDemo() {
getContentPane().setLayout(null);
btnFirst = new JButton("first");
btnFirst.setBackground(Color.RED);
btnFirst.setBounds(10, 60, 85, 23);
getContentPane().add(btnFirst);
btnSecond = new JButton("second");
btnSecond.setBackground(Color.GREEN);
btnSecond.setBounds(100, 60, 85, 23);
getContentPane().add(btnSecond);
btnThird = new JButton("third");
btnThird.setBackground(Color.BLUE);
btnThird.setBounds(200, 60, 85, 23);
getContentPane().add(btnThird);
new Thread(this).start();
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(450, 300);
setVisible(true);
}
public static void main(String[] args) {
new AppDemo();
}
public void run() {
while (true) {
try {
if (index == 1) {
btnFirst.setBounds(btnFirst.getX() + 5, 60, 85, 23);
if (btnFirst.getX() == 100) {
break;
}
} else if (index == 2) {
btnSecond.setBounds(btnSecond.getX() + 5, 60, 85, 23);
if (btnSecond.getX() == 200) {
break;
}
} else {
btnThird.setBounds(btnThird.getX() + 5, 60, 85, 23);
if (btnThird.getX() == 300) {
break;
}
}
Thread.sleep(500);
} catch (Exception e) {
}
}
if (index < 4) {
index++;
new Thread(this).start();
}
}
}
public class ThreadRuningTime {
public static AtomicInteger integer = new AtomicInteger(0);
public static AtomicInteger s = new AtomicInteger(0);
public static int threadNum = 3;
public static void main(String[] args) {
for (int i = 0; i < threadNum; i++) {
new Thread(new MyThread()).start();
}
new Thread(new Runnable() {
public void run() {
while(true) {
if (s.get()==threadNum) {
System.out.println(integer.get());
break;
}
}
}
}).start();
}
public static class MyThread implements Runnable {
@Override
public void run() {
long startTime = System.currentTimeMillis();
try {
Thread.sleep(new Random().nextInt(2000));
} catch (InterruptedException e) {
e.printStackTrace();
}
for (int i = 0; i < 10000000; i++) {
integer.incrementAndGet();
}
System.out.println(Thread.currentThread().getName()+" running time "+(System.currentTimeMillis()-startTime+"ms"));
s.incrementAndGet();
}
}
}
用Calendar的话,打印时间的地方就改为Calendar.getInstance().getTime()
我很奇怪,为什么代码贴不上来?? 图片也插入不了?
import java.util.Calendar;
import java.util.concurrent.locks.Lock;
public class MultiThread {
static Lock mylock;
public static void main(String[] args) {
RunningObject1 r1 = new RunningObject1();
Thread t1 = new Thread(r1, "t1");
Thread t2 = new Thread(r1, "t2");
Thread t3 = new Thread(r1, "t3");
t1.start();
t3.start();
t2.start();
}
static class RunningObject1 implements Runnable {
public void run() {
synchronized(this){
String name=Thread.currentThread().getName();
System.out.println(name+"开始时间:"+Calendar.getInstance().getTimeInMillis());
for (int i = 0; i < 100000000; i++) {
if (i == 9999999) {
System.out.println(name+"结束时间:"+Calendar.getInstance().getTimeInMillis());
break;
}
}
}
}
}
}
public class ThreadE{
class Thread2 implements Runnable{
public void run(){
System.out.println(Thread.currentThread().getName()+" run "+Calendar.getInstance().getTime());
}
}
public static void main(String[] args) {
ThreadE te = new ThreadE();
new Thread(te.new Thread2()).start();
new Thread(te.new Thread2()).start();
new Thread(te.new Thread2()).start();
}
}
import java.util.Calendar;
public class MyThread implements Runnable{
String name;
public MyThread(String name){
this.name = name;
}
@Override
public void run() {
Calendar time1 = Calendar.getInstance();
long t1 = time1.getTimeInMillis();
/*---------------------
线程体
-----------------------------------*/
Calendar time2 = Calendar.getInstance();
long t2 = time2.getTimeInMillis();
System.out.println("线程"+name+"运行时间为:"+(t2-t1)+"毫秒");
}
}
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