public static Singleton getInstance() {
if (instance == null) {
synchronized (Singleton.class) {
if (instance == null) {
instance = new Singleton();
}
}
}
return instance;
}
语言 | 书籍 | 价格 |
---|---|---|
Java | 编程思想 | ¥10 |
kotlin | Kotlin开发快速入门与实战 | ¥2 |