如何改写单例模式？在连接请求这一块儿出现了多次重复连接，需要改为单例模式。

如题：

 class InitSocketThread extends Thread {
        public void run() {
            super.run();
            try {
                initSocket();
            } catch (UnknownHostException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
}

求大神帮助啊，急求！！！！

class MyThreadScopeData{
//将类变成单例的
private MyThreadScopeData(){}

public static MyThreadScopeData getThreadInstance(){
MyThreadScopeData instance = map.get();
if(instance==null){
instance = new MyThreadScopeData();
map.set(instance);
}
return instance;
}

private static ThreadLocal map = new ThreadLocal();

public void initSocket(){
initSocket();
}
}

这种写法只适用于单线程情况，针对多线程下还是会出问题