培训机构多线程同步的面试题目

 子线程循环10次,接着主线程循环100次,接着又回到子线程循环10次,再接着主线程循环100次,如此循环50次,写出程序

1  主线程和子线程共享的那个类 

public class Business {
private boolean isSubThread=true;


public  synchronized  void printMain(int loop){

while(isSubThread){

try {
this.wait();
} catch (InterruptedException e) {
   e.printStackTrace();
}

}

for(int i=1;i<=100;i++){
 
System.out.println("第"+loop+"次大循环 主线程第"+i+"循环"  );
 
}

System.out.println("==================="  );
this.notifyAll();
isSubThread=true;


}


public  synchronized  void printSub(int loop){

while(!isSubThread){

try {
this.wait();
} catch (InterruptedException e) {
   e.printStackTrace();
}

}

for(int i=1;i<=10;i++){
 
System.out.println("第"+loop+"次大循环 子线程第"+i+"循环"  );
 
}
System.out.println("==================="  );

this.notifyAll();
isSubThread=false;


}


}

2  主线程

public class MainThread extends Thread {
private Business business;
public MainThread(Business business) {
super();
this.business = business;
}

@Override
public void run() {
for(int i=1;i<=50;i++){
business.printMain(i);
}
}


/**
* @param args
*/
public static void main(String[] args) {
 
Business  business=new Business();
Thread mainThread=new MainThread(business);
Thread subThread=new SubThread(business);
mainThread.start();
subThread.start();
}


}

3 子线程

public class SubThread  extends Thread {
private Business business;


public SubThread(Business business) {
super();
this.business = business;
}

@Override
public void run() {
for(int i=1;i<=50;i++){
business.printSub(i);
}
}


 
}