SZStudy的博客

一、懒汉模式public class LazySingleton { /** *  * 构造函数私有化 */ //懒汉模式 private LazySingleton() { } private static LazySingleton singleton; public static LazySingleton get...

一、创建一个接口public interface Shape { void draw();}二、创建实现接口的实体类public class Rectangle implements Shape { @Override public void draw() { System.out.println("Inside Rectangle::draw(...

一、为形状创建一个接口public interface Shape { void draw();}二、创建实现接口的实体类public class Rectangle implements Shape { @Override public void draw() { System.out.println("Inside Rectangle::dr...