Posted on 2006-11-26 13:57
Jaunt 阅读(757)
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原文出处:
http://www.javatang.com/archives/2006/06/27/512049.html
编辑: Jaunt
声明: 请维持文章的完整性任意转载
SingletonTest.java：
public class SingletonTest {
public static void main(String[] args) {
Singleton s1 = Singleton.getInstance();
Singleton s2 = Singleton.getInstance();
System.out.println("s1=s2?" + (s1==s2));
System.out.println("s1.getNextID = " + s1.getNextID());
System.out.println("s2.getNextID = " + s2.getNextID());
System.out.println("s1.getNextID = " + s1.getNextID());
System.out.println("s1.getNextID = " + s1.getNextID());
System.out.println("s2.getNextID = " + s2.getNextID());
System.out.println("s2.getNextID = " + s2.getNextID());
}
}
class Singleton {
private static int nextID = 0;
private static Singleton instance = null;
private Singleton() {};
public static synchronized Singleton getInstance() {
if (instance == null) {
instance = new Singleton();
}
return instance;
}
// inside data
public synchronized int getNextID() {
return ++nextID;
}
}
输出结果：
s1=s2?true
s1.getNextID = 1
s2.getNextID = 2
s1.getNextID = 3
s1.getNextID = 4
s2.getNextID = 5
s2.getNextID = 6