Design Patterns 创建模式 之 Singleton

Design Patterns  创建模式 之 Singleton
1 Singleton

public class Single {
	private static Single single = null;
	private Single() {
		System.out.println("only one !");
	};
	public static Single getInstanceL() {
		synchronized (Single.class) {
			if (single == null) {
				single = new Single();
			}
		}
		return single;
	}
}
//-----------------------------------------------------
public class Single {
	private static Single single = new Single();
	private Single() {
		System.out.println("only one !");
	};
	public static Single getInstanceL() {
		return single;
	}
}