ThreadLocal實現執行緒安全的經典例子
阿新 • • 發佈：2019-01-09
public class SequenceNumber {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
SequenceNumber sn = new SequenceNumber();
TestClient t1 = new TestClient(sn);
TestClient t2 = new TestClient(sn);
TestClient t3 = new TestClient(sn);
t1.start();
t2.start();
t3.start();
}
private static ThreadLocal<Integer> seqNum = new ThreadLocal<Integer>(){
@Override
protected Integer initialValue() {
// TODO Auto-generated method stub
return 0;
}
};
public int getNextNum(){
seqNum.set(seqNum.get()+1);
return seqNum.get();
}
private static class TestClient extends Thread{
private SequenceNumber sn;
public TestClient(SequenceNumber sn){
this.sn = sn;
}
public void run(){
for(int i=0;i<3;i++){
System.out.println("thread["+Thread.currentThread().getName()+"]sn["+sn.getNextNum()+"]");
}
}
}
}