线程基础(一)实现线程两种方式&线程互斥synchronized

一 实现线程两种方式

 1.定义Thread类的子类,并重写该类的run方法,该run方法的方法体就代表了线程要完成的任务。因此把run()方法称为执行体。

Thread thread = new Thread() {
@Override
public void run() {
while(true) {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("1:"+Thread.currentThread().getName());
}
}
};

thread.start();

2.定义runnable接口的实现类,并重写该接口的run()方法,该run()方法的方法体同样是该线程的线程执行体。

Thread thread2 = new Thread(new Runnable() {
@Override
public void run() {
while(true) {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("2:"+Thread.currentThread().getName());
}
}
});
thread2.start();

}

二 线程互斥,保证同一个线程执行完

案例:打印两个人的名字拼音,保证同一个人打印完,不受另一个的影响

public class TraditionalThreadSynchronnized {
    
public static void main(String[] args) {
new TraditionalThreadSynchronnized().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("pengyunle");
}

}
}).start();

new Thread(new Runnable() {
@Override
public void run() {
while(true) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
outputer.output("lichengli");
}

}
}).start();
}

class OutPuter{
public synchronized void output(String name) {
int len = name.length();
for(int i= 0;i<len;i++) {
System.out.print(name.charAt(i));
}
System.out.println();
}
}
}

三 timer计数器


四 子线程循环10次,主线程循环100次,接着又回到子线程循环10次,接着再回到主线程循环100次,如此循环50次

public class TraditionalThreadCommunication {      //子线程循环10次,主线程循环100次,接着又回到子线程循环10次,接着再回到主线程循环100次,如此循环50次 public static void main(String[] args) { final Business business =new Business(); new Thread(new Runnable() { @Override public  void run() { for(int j = 1; j <=50 ;j++) { business.sub(j);    } } }).start(); new Thread(new Runnable() { @Override public void run() { for(int j = 1; j <=50 ;j++) { business.main(j);    } } }).start(); } } class Business{   private boolean shelud = true; public synchronized void sub(int j) { while(!shelud) { try { this.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } for(int i=1;i<=10;i++) { System.out.println("sub thread sequnce of "+i+","+"loop of "+j); } shelud = false; this.notify(); }    public synchronized void main(int j) { while(shelud) { try { this.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } for(int i=1;i<=100;i++) { System.out.println("main thread sequnce of "+i+","+"loop of "+j); } shelud = true; this.notify(); }    }