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###修改ubuntu初始密码
#sudo passwd root

###修改主机名　
#/etc/hostname
#/etc/hosts

###安装ssh服务
#sudo apt-get install openssh-server

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[root@Iven sysconfig]# cat iptables
# Generated by iptables-save v1.4.7 on Mon Jun  1 00:04:12 2015
*nat
:PREROUTING ACCEPT [49:4737]
:POSTROUTING ACCEPT [2:144]
:OUTPUT ACCEPT [2:144]
-A PREROUTING -p tcp -m tcp --dport 22222 -j REDIRECT --to-ports 22 
COMMIT
# Completed on Mon Jun  1 00:04:12 2015
# Generated by iptables-save v1.4.7 on Mon Jun  1 00:04:12 2015

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public class Test{
    public String a = "hello";
}

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<h1>发觉自己的爱好！做有意义的事，倾听</h1>

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/**
 * see http://caterpillar.onlyfun.net/Gossip/DesignPattern/SingletonPattern.htm
 * http://www.jackforfun.com/2007/07/java-synchronized.html
 */
public class Singleton {
    private static Singleton instance = null;
    private Singleton(){}
    public static Singleton getInstance() {
        if (instance == null){
            synchronized(Singleton.class){

doubledouble

package test;

import java.util.Scanner;

public class ScissorStoneCloth {

    /**
     * @param args
     */
    public static void main(String[] args) {

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 private static void doCopyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException {
        if (destFile.exists() && destFile.isDirectory()) {
            throw new IOException("Destination '" + destFile + "' exists but is a directory");
        }

        FileInputStream fis = null;
        FileOutputStream fos = null;
        FileChannel input = null;
        FileChannel output = null;
        try {

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public class SingleInstance {
    
    private static class InstanceHolder {
        public static final SingleInstance instance = new SingleInstance();
    }

    public static SingleInstance getInstance() {
        return InstanceHolder.instance;
    }
}

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public enum SingletonEnum {

    /**
     * 定义一个枚举的元素，它就代表了Singleton的一个实例。
     */
    uniqueInstance;
    
    /**
     * 单例可以有自己的操作
     */

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package com.iteye.common.test;  
  
import junit.framework.TestCase;  
  
import org.hibernate.FlushMode;  
import org.hibernate.Session;  
import org.hibernate.SessionFactory;  
import org.springframework.context.ApplicationContext;  
import org.springframework.context.support.ClassPathXmlApplicationContext;  
import org.springframework.orm.hibernate3.SessionFactoryUtils;