Java多线程目录
创建多线程的3种方式
1、继承Thread类实现多线程
Thread thread = new Thread() {
@Override
public void run() {
super.run();
while (true) {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("1:" + Thread.currentThread().getName());
System.out.println("2:" + this.getName());
}
}
};
thread.start();
2、实现Runnable接口方式实现多线程
Thread thread1 = new Thread(new Runnable() {
@Override
public void run() {
while (true) {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("3:" + Thread.currentThread().getName());
}
}
});
thread1.start();
定时器
import java.util.Timer;
import java.util.TimerTask;
public class TraditionalTimerTest {
public static void main(String[] args) {
// new Timer().schedule(new TimerTask() {
// @Override
// public void run() {
//
// System.out.println("bombing!");
// }
// },10000);
class MyTimberTask extends TimerTask {
@Override
public void run() {
System.out.println("bombing!");
new Timer().schedule(new MyTimberTask(), 2000);
}
}
new Timer().schedule(new MyTimberTask(), 2000);
int count = 0;
while (true) {
System.out.println(count++);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
0
1
bombing!
2
3
bombing!
4
5
bombing!
6
省略...
线程的互斥与同步通信
public class TraditionalThreadSynchronized {
public static void main(String[] args) {
new TraditionalThreadSynchronized().init();
}
private void init() {
final Outputer outputer = new Outputer();
new Thread(new Runnable() {
@Override
public void run() {
while (true) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
outputer.output("kpioneer");
}
}
}).start();
// new Thread(new Runnable() {
// @Override
// public void run() {
//
// while (true) {
// try {
// Thread.sleep(10);
// } catch (InterruptedException e) {
// e.printStackTrace();
// }
// outputer.output2("Tom");
//
// }
// }
// }).start();
new Thread(new Runnable() {
@Override
public void run() {
while (true) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
outputer.output3("Jack");
}
}
}).start();
}
static class Outputer {
public void output(String name) {
int len = name.length();
synchronized (Outputer.class) {
for (int i = 0; i < len; i++) {
System.out.print(name.charAt(i));
}
System.out.println();
}
}
public synchronized void output2(String name) {
int len = name.length();
for (int i = 0; i < len; i++) {
System.out.print(name.charAt(i));
}
System.out.println();
}
public static synchronized void output3(String name) {
int len = name.length();
for (int i = 0; i < len; i++) {
System.out.print(name.charAt(i));
}
System.out.println();
}
}
}
线程同步通信技术
子线程循环10次，接着主线程循环100，接着又回到子线程循环10次，接着再回到主线程有循环100，如此循环50次，请写出程序。
public class TraditionalThreadCommunication {
public static void main(String[] args) {
final Business business = new Business();
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 1; i <= 50; i++) {
business.sub(i);
}
}
}
).start();
for (int i = 1; i <= 50; i++) {
business.main(i);
}
}
}
/**
*要用到共同数据(包括同步锁)的若干方法应该归在同一个类身上，
* 这种设计正好体现了高类聚和和程序的健壮性
*/
class Business {
private boolean bShouldSub = true;
public synchronized void sub(int i) {
if(!bShouldSub) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
for (int j = 1; j <= 10; j++) {
System.out.println("sub thread sequece of " + j + ",loop of " + i);
}
bShouldSub = false;
this.notify();
}
public synchronized void main(int i) {
if(bShouldSub) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
for (int j = 1; j <=100; j++) {
System.out.println("main thread sequece of " + j + ",loop of " + i);
}
bShouldSub = true;
this.notify();
}
}
sub thread sequece of 1,loop of 1
sub thread sequece of 2,loop of 1
sub thread sequece of 3,loop of 1
sub thread sequece of 4,loop of 1
sub thread sequece of 5,loop of 1
sub thread sequece of 6,loop of 1
sub thread sequece of 7,loop of 1
sub thread sequece of 8,loop of 1
sub thread sequece of 9,loop of 1
sub thread sequece of 10,loop of 1
main thread sequece of 1,loop of 1
main thread sequece of 2,loop of 1
main thread sequece of 3,loop of 1
main thread sequece of 4,loop of 1
main thread sequece of 5,loop of 1
main thread sequece of 6,loop of 1
main thread sequece of 7,loop of 1
main thread sequece of 8,loop of 1
main thread sequece of 9,loop of 1
main thread sequece of 10,loop of 1
main thread sequece of 11,loop of 1
省略中间...
main thread sequece of 99,loop of 1
main thread sequece of 100,loop of 1
sub thread sequece of 1,loop of 2
sub thread sequece of 2,loop of 2
sub thread sequece of 3,loop of 2
sub thread sequece of 4,loop of 2
sub thread sequece of 5,loop of 2
sub thread sequece of 6,loop of 2
sub thread sequece of 7,loop of 2
sub thread sequece of 8,loop of 2
sub thread sequece of 9,loop of 2
sub thread sequece of 10,loop of 2
main thread sequece of 1,loop of 2
main thread sequece of 2,loop of 2
main thread sequece of 3,loop of 2
省略...