qzqanzc的博客

双锁检测public class Singleton { private static volatile Singleton singleton; private Singleton() {} public static Singleton getInstance() { if (singleton == null) { ...

public class YamlReadUtils{ private YamlReadUtils() { if (SingletonHolder.instance != null) { throw new IllegalStateException(); } } /** * use static inner class achieve singleton ...

import java.io.IOException;import java.io.InputStreamReader;import java.util.Properties;/** * Property read tools */public class PropertyReader { private volatile static PropertyReader in...