Thread(多线程，单例模式懒汉式)

package process;

//饿汉式
class Single{
	private Single(){}
	private static Single s = new Single();
	
	public static Single getInstance(){
		return s;
	}
	
}
//懒汉式:双层判断
class Single1{
	private Single1(){}
	private static Single1 s = null;
	
	public static Single1 getInstance(){
		if(s == null){
			synchronized(Single1.class){
				if(s == null){
					 s = new Single1();
				}
			}
		}
		return s;
		
		
	}
}
public class ThreadSingle {

}