Initialization-on-demand holder idiom 单例

在wikipedia中看到一种单例，效果不错，分享一下。

public class Something {    private Something() {}    private static class LazyHolder {        static final Something INSTANCE = new Something();    }    public static Something getInstance() {        return LazyHolder.INSTANCE;    }}

参考：http://blog.csdn.net/dl88250/article/details/5439024

http://ifeve.com/initialization-on-demand-holder-idiom/