Java官方笔记11包
本书作者:测试开发刚哥,文章版权归个人所有,未经授权请勿转载。 Packages Definition: A package is a grouping of related types providing access protection and name space management. Note that types refers to classes, interfaces, enumerations, and annotation types. Enumerations and annotation types are special kinds of classes and interfaces, respectively, so types are often referred to in this section simply as classes and interfaces. 创建 //in the Draggable.java file package graphics; public interface Draggable { . . . } //in the Graphic.java file package graphics; public abstract class Graphic { . . . } //in the Circle.java file package graphics; public class Circle extends Graphic implements Draggable { . . . } //in the Rectangle.java file package graphics; public class Rectangle extends Graphic implements Draggable { . . . } //in the Point.java file package graphics; public class Point extends Graphic implements Draggable { . . . } //in the Line.java file package graphics; public class Line extends Graphic implements Draggable { . . . } 文件顶部第一行,每个文件只能有1个package关键字。 ...