6. Read-Write Lock 模式*

大家一起读没问题，但读的时候不要写哦

public class Main{
    public static void main(String[] args){
        Data data = new Data(10);
        new ReaderThread(data).start();
        new ReaderThread(data).start();
        new ReaderThread(data).start();
        new ReaderThread(data).start();
        new ReaderThread(data).start();
        new ReaderThread(data).start();
        new WriteThread(data,"ABCDEFGHIJKLMNOPQRSTUVWXYZ");
        new WriteThread(data,"abcdefghijklmnopqrstuvwxyz");
    }
}