singletone.java

java 教程相应的代码 全是自己写的内附注释 很容易看明白的

package demo.chapter09;

public class Singletone {
	
	private static volatile Singletone me;

	private Singletone() {
	}
	
	public static Singletone getInstance() {
		if (me == null)
			synchronized (Singletone.class) {
				if (me == null)
					me = new Singletone();
			}
		return me;
	}
}