单例java_JAVA_编程开发_程序员俱乐部

class="java">
一、
public class Singleton {

	private Singleton() {
	};

	private static Singleton single = new Singleton();
	public static Singleton getInstance() {
		return single;
	}
}


二、
public class Singleton {

	private Singleton() {
	};

	private static Singleton single = null;

	public synchronized static Singleton getInstance() {
		if (single == null) {
			single = new Singleton();
		}
		return single;
	}
}