单例设计模式-java中饿汉与懒汉的故事

class Family{
    private int number;
    private String name;
    private Family(){
    }        //构造器私有化
    private static Family Instance=new Family();  
    //内部创建类得对象
    public static Family getInstance(){
        return Instance;
    }
    //提供公共得静态方法，且返回对象。
}
public class Test3 {
    public static void main(String[] args) {
        Family family1=Family.getInstance();
        Family family2=Family.getInstance();
    }
}

class lazy {
    private lazy(){
    }
    private static lazy Instance = null;
    //声明当前对象没有初始化值
    public static lazy getInstance(){
        if (Instance==null){
            Instance=new lazy();
            //需要再造对象，不要就不new对象了
        }
        return Instance;
    }
}
public class Test32 {
    public static void main(String[] args) {
       lazy lazy1=lazy.getInstance();
    }
}