?? singleton.java
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package headfirst.singleton.dcl;//// Danger! This implementation of Singleton not// guaranteed to work prior to Java 5//public class Singleton { private volatile static Singleton uniqueInstance; private Singleton() {} public static Singleton getInstance() { if (uniqueInstance == null) { synchronized (Singleton.class) { if (uniqueInstance == null) { uniqueInstance = new Singleton(); } } } return uniqueInstance; }}
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