单例模式实现

//饿汉模式
public class HurrySingleton {
private static final HurrySingleton INSTANCE = new HurrySingleton();
    //私有化构造子,阻止外部直接实例化对象
    private HurrySingleton(){
    }
    /**
     * 获取类的单例实例
     */
    public static HurrySingleton getInstance(){
        return INSTANCE;
    }
}
// 懒汉单例模式
public class LazySignleton {
     private static LazySignleton INSTANCE = null;
        // 私有化构造子,阻止外部直接实例化对象
        private LazySignleton(){
        }
        // 获取类的单例实例   
        public static LazySignleton getInstance(){
            if(INSTANCE == null){
                synchronized (LazySignleton.class) {
                    if(INSTANCE == null){
                        INSTANCE = new LazySignleton();
                    }
                }
            }
            return INSTANCE;
        }
}