1. 单例模式
1.1饿汉式（开发常用）
class SingleFirst
{
/*
添加其他成员信息
*/
private static SingleFirst s1 = new SingleFirst();
private SingleFirst(){
}
public static SingleFirst getInstance(){
return s1;
}
}
1.2 懒汉式
class SingleSecond
{
/*
添加其他成员信息
*/
private static SingleSecond s2 = null;
private SingleSecond(){
}
public static SingleSecond getInstance(){
if(null==s2)
s2 = new SingleSecond();
return s2;
}
}