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java - Java / Java EE

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Java code:

public class A{
private static A a = new A();
private A(){}
public static A get(){
return a;
}
}


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Java code:

//µÚÒ»ÖÖµ¥Àýģʽ
public class Singleton1 {
//½«¹¹Ô캯Êý˽Óл¯
private Singleton1()
{

}
//newÒ»¸öµ±Ç°ÀàµÄ¶ÔÏ󣬽«ÆäÉèÖÃΪ¾²Ì¬µÄ£¬Ë½Óл¯
private static Singleton1 s1 = new Singleton1();
//¶¨ÒåÒ»¸ö·½·¨£¬Í¨¹ý·½·¨À´µ÷ÓûñµÃÀà¶ÔÏó
public static Singleton1 getInstance()
{
return s1;
}
}


public class Singleton2 {

private Singleton2()
{

}

private static Singleton2 s2 = null;

public static synchronized Singleton2 getInstance()
{
if(s2==null)
{
s2 = new Singleton2();
}
return s2;
}
}




http://www.yesky.com/209/1724209.shtml
-
http://leiwuluan.javaeye.com/blog/364581
-
http://www.web36.cn/java/basic/2009/0610/98.html

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