相关代码
饿汉式代码示例:
public class Singleton {
private static Singleton instance = new Singleton();
private Singleton() {}
public static Singleton getInstance() {
return instance;
}
}
懒汉式代码实例:
public class Singleton {
private static Singleton instance = null;
private Singleton() {}
public static Singleton getInstance() {
if (instance == null) { // 判断是否有必要用“锁”
synchronized ("haha") {
if (instance == null) { // 判断是否有必要创建对象
instance = new Singleton();
}
}
}
return instance;
}
}