案例1.接口之打印机
/*** 纸张接口* @author DELL**/public interface Paper {/*** 得到纸张大小*/public String GetSize();}/*** 墨盒接口* @author DELL**/public interface InkBox {/*** 得到纸张大小*/public String GetColor();}
public class ColorInkBox implements InkBox {public String GetColor(){return "彩色";}}public class GrayInkBox implements InkBox {public String GetColor(){return "黑白";}}public class A4 implements Paper {public String GetSize(){return "A4";}}public class A5 implements Paper {public String GetSize(){return "A5";}}
/*** 打印机类* @author DELL**/public class Printer {/*** 使用墨盒在纸张上打印*/public void print(InkBox inkBox,Paper paper){System.out.println("使用"+inkBox.GetColor()+"墨盒在"+paper.GetSize()+"纸张上打印。");}
public class Text {/*** @param args*/public static void main(String[] args) {// TODO Auto-generated method stub//定义打印机InkBox i = null;Paper p = null;Printer pt = new Printer();//使用黑白墨盒在A4纸上打印i = new GrayInkBox();p = new A4();pt.print(i, p);//使用彩色墨盒在A5纸上打印i = new ColorInkBox();p = new A5();pt.print(i, p);}}结果：使用黑白墨盒在A4纸张上打印。使用彩色墨盒在A5纸张上打印。
案例2. 接口之写信
/*** 家书接口*/public interface HomeLetter {/*** 书写称谓*/public void writetitle();/*** 书写问候*/public void writehello();/*** 书写内容*/public void writebody();/*** 书写祝福*/public void writegreeting();/*** 书写落款*/public void writeself();}
/*** 接口实现类* * @author DELL**/public class HomeLetterImp implements HomeLetter {@Overridepublic void writetitle() {// TODO Auto-generated method stubSystem.out.println("亲爱的爸爸妈妈：");}@Overridepublic void writehello() {// TODO Auto-generated method stubSystem.out.println("\t你们好吗？");}@Overridepublic void writebody() {// TODO Auto-generated method stubSystem.out.println("\t我在这里挺好的。\n\t我会努力学习的，已经学到java OOP啦！\n\t您二老保重身体啊！");}@Overridepublic void writegreeting() {// TODO Auto-generated method stubSystem.out.println("\n\t此致\n敬礼");}@Overridepublic void writeself() {// TODO Auto-generated method stubSystem.out.println("\t\t\t周杰\n\t\t\t.06.01");}}
public class HomeLetterWriter {/*** 按照约定格式书写家书*/public static void write(HomeLetter letter){letter.writetitle();letter.writehello();letter.writebody();letter.writegreeting();letter.writeself();}}
public class Test {/*** @param args*/public static void main(String[] args) {// TODO Auto-generated method stub//创建家书对象HomeLetter letter = new HomeLetterImp();//书写家书HomeLetterWriter.write(letter);}}结果：亲爱的爸爸妈妈：你们好吗？我在这里挺好的。我会努力学习的，已经学到java OOP啦！您二老保重身体啊！此致敬礼周杰.06.01
案例3.接口之应聘
public interface Person {public String getName();}
public interface BigAgent extends Person {//具备讲解业务能力void Speaking();}public interface Programmer extends Person {//具备编码能力void bianCode();}
public class SoftEngineer implements Programmer,BigAgent {private String name ;public SoftEngineer(String name) {// TODO Auto-generated method stubthis.name = name;}@Overridepublic void Speaking() {// TODO Auto-generated method stubSystem.out.println("我会讲业务。");}@Overridepublic void bianCode() {// TODO Auto-generated method stubSystem.out.println("我会写代码。");}public String getName(){return name;}}
public class Test {/*** @param args*/public static void main(String[] args) {// TODO Auto-generated method stubSoftEngineer xiaoming = new SoftEngineer("小明");System.out.println("我是一名软件工程师，名字叫"+xiaoming.getName()+"。");xiaoming.bianCode();xiaoming.Speaking();}}结果：我是一名软件工程师，名字叫小明。我会写代码。我会讲业务。
