JAVA多线程设计模式四 Balking Pattern

?
?
public class Main {    public static void main(String[] args) {        Data data = new Data("data.txt", "(empty)");        new ChangerThread("ChangerThread", data).start();        new SaverThread("SaverThread", data).start();    }}
?
?
条件不满足，则跳过。并不wait()