Singleton

发表于
Java单例模式
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//延迟实例化（多线程）
public class Singleton {
    private volatile static Singleton uniqueInstance;
    
    private Singleton() {}
    
    private static Singleton getInstance() {
        if (uniqueInstance == null) {
            synchronized (Singleton.class) {
                if (uniqueInstance == null) {
                    uniqueInstance = new Singleton();
                }  
            }
        }
        return uniqueInstance;
    }
}
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//急切模式
public class Singleton {
    private static Singleton uniqueInstance = new Singleton();
    
    private Singleton() {}
    
    private static Singleton getInstance() {
        return uniqueInstance;
    }
}