原文链接
http://java.sun.com/javase/technologies/hotspot/vmoptions.jsp
This document provides information on typical command-line options and environment variables that can affect the performance characteristics of the Java HotSpot Virtual Machine. Unless otherwise noted, all information in this docu ...
Probably the first design pattern that every software developer learns is Singleton and lazy loading of Singleton classes.
The usual example, goes something like this:
public class Singleton {
static Singleton instance;
public static synchronized Singleton getInstance() {
if (instanc ...
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