java實驗報告-繼承與接口

1、成績： 面向?qū)ο笤砼cJava實踐課程實驗報告實驗2：繼承與接口姓 名 _ _ 班 級 _ _ 學 號 _ _ 實驗地點 _ _ 實驗時間 _ _ 指導教師 _ _ 一、實驗目的：l 掌握類的繼承機制，掌握成員變量的隱藏與方法的重寫l 掌握接口的定義和實現(xiàn)方法二、實驗要求：l 復習類的繼承以及接口的設(shè)計方法l 注意保證類的封裝性l 編寫程序完成以下實驗內(nèi)容并上交實驗報告三、實驗內(nèi)容：1、P153：習題42、P153：習題53、P153：習題64、在程序包packageOne中編寫至少含一個方法的公有接口InterfaceOne。在程序包packageTwo中定義公有類SuperClass，該類

2、含有一個受保護的內(nèi)部類InnerClass，這個類實現(xiàn)接口InterfaceOne。在程序包packageThree中定義公有類SubClass繼承SuperClass，類SubClass定義一個返回類型為InterfaceOne的方法返回內(nèi)部類InnerClass的對象實例。請正確使用程序包組織以上類和接口，編譯并運行，并觀察編譯器生成的字節(jié)碼文件的命名方式。四、設(shè)計思路：習題4的設(shè)計思路是設(shè)計一個抽象類作為父類，并設(shè)計相關(guān)字段以及計算成績等級的抽象方法，然后再設(shè)計本科生類和研究生類作為子類繼承，并且各自實現(xiàn)其計算成績等級的抽象方法，最終將結(jié)果輸出。習題5的設(shè)計思路跟習題4相同，只需額外設(shè)計

3、一個枚舉類存儲學生的成績等級，并對相關(guān)代碼作少許修改即可。習題6的設(shè)計思路是習題4的延伸，在習題4的類結(jié)構(gòu)基礎(chǔ)上，將原來的計算成績等級的抽象方法提取出來，放在一個公有接口中，然后再分別設(shè)計計算本科生和研究生成績等級的類實現(xiàn)接口的抽象方法。五、程序源代碼：習題4的源代碼：package Package_4;public abstract class Student String Name=""String Stu_type=""int C_score;int English_score;int Java_score;int score;String sco

4、_Level=""public Student(String name,String stu_type,int sco1,int sco2,int sco3)Name=name;Stu_type=stu_type;C_score=sco1;English_score=sco2;Java_score=sco3;score=(sco1+sco2+sco3)/3;package Package_4;public class Undergraduate extends Studentpublic Undergraduate(String name,String stu_type,i

5、nt sco1,int sco2,int sco3)super(name,stu_type,sco1,sco2,sco3);if(score>=85&score<=100)sco_Level="優(yōu)秀"else if(score>=75&score<85)sco_Level="良好"else if(score>=65&score<75)sco_Level="中等"else if(score>=60&score<65)sco_Level="及格&qu

6、ot;else if(score>=0&score<60)sco_Level="不及格"elsesco_Level="未知等級"static void Output(Undergraduate udg)System.out.println("*本科生*");/System.out.println("");System.out.print("姓名");System.out.print('t'+"學生類型");System.out.print(

7、't'+"C語言成績");System.out.print('t'+"英語成績");System.out.print('t'+"Java成績");System.out.print('t'+"平均分");System.out.println('t'+"成績等級");for(int i=0; i<udg.length;i+)System.out.print(udgi.Name);System.out.print(&

8、#39;t'+udgi.Stu_type);System.out.print('t'+String.valueOf(udgi.C_score);System.out.print('t'+String.valueOf(udgi.English_score);System.out.print('t'+String.valueOf(udgi.Java_score);System.out.print('t'+String.valueOf(udgi.score);System.out.println('t'+udgi

9、.sco_Level);System.out.println();package Package_4;public class Postgraduate extends Studentpublic Postgraduate(String name,String stu_type,int sco1,int sco2,int sco3)super(name,stu_type,sco1,sco2,sco3);if(score>=90&score<=100)sco_Level="優(yōu)秀"else if(score>=80&score<90)sc

10、o_Level="良好"else if(score>=70&score<80)sco_Level="中等"else if(score>=60&score<70)sco_Level="及格"else if(score>=0&score<60)sco_Level="不及格"elsesco_Level="未知等級"static void Output(Postgraduate pg)System.out.println("*研究生*

11、");/System.out.println("");System.out.print("姓名");System.out.print('t'+"學生類型");System.out.print('t'+"C語言成績");System.out.print('t'+"英語成績");System.out.print('t'+"Java成績");System.out.print('t'+"

12、;平均分");System.out.println('t'+"成績等級");for(int i=0; i<pg.length;i+)System.out.print(pgi.Name);System.out.print('t'+pgi.Stu_type);System.out.print('t'+String.valueOf(pgi.C_score);System.out.print('t'+String.valueOf(pgi.English_score);System.out.print(&

13、#39;t'+String.valueOf(pgi.Java_score);System.out.print('t'+String.valueOf(pgi.score);System.out.println('t'+pgi.sco_Level);System.out.println();package Package_4;public class Test public static void main(String args) Undergraduate udg=new Undergraduate5;udg0=new Undergraduate(&qu

14、ot;小明","本科生",80,95,79);udg1=new Undergraduate("小紅","本科生",60,82,76);udg2=new Undergraduate("小白","本科生",90,49,67);udg3=new Undergraduate("小黑","本科生",56,74,65);udg4=new Undergraduate("小軍","本科生",68,81,84);Postgr

15、aduate pg=new Postgraduate5;pg0=new Postgraduate("小明","研究生",80,95,79);pg1=new Postgraduate("小紅","研究生",60,82,76);pg2=new Postgraduate("小白","研究生",90,49,67);pg3=new Postgraduate("小黑","研究生",56,74,65);pg4=new Postgraduate(&qu

16、ot;小軍","研究生",68,81,84);Undergraduate.Output(udg);Postgraduate.Output(pg);習題5的源代碼：package Package_5;public enum Sco_Level A("優(yōu)秀"),B("良好"),C("中等"),D("及格"),E("不及格"),X("未知等級");private String signal;Sco_Level(String level)this.sig

17、nal=level;public String getSignal()return signal;package Package_5;public abstract class Student String Name=""String Stu_type=""int C_score;int English_score;int Java_score;int score;/String sco_Level=""Sco_Level sco_Level;public Student(String name,String stu_type,int

18、 sco1,int sco2,int sco3)Name=name;Stu_type=stu_type;C_score=sco1;English_score=sco2;Java_score=sco3;score=(sco1+sco2+sco3)/3;package Package_5;public class Undergraduate extends Studentpublic Undergraduate(String name,String stu_type,int sco1,int sco2,int sco3)super(name,stu_type,sco1,sco2,sco3);if(

19、score>=85&score<=100)sco_Level=Sco_Level.A;else if(score>=75&score<85)sco_Level=Sco_Level.B;else if(score>=65&score<75)sco_Level=Sco_Level.C;else if(score>=60&score<65)sco_Level=Sco_Level.D;else if(score>=0&score<60)sco_Level=Sco_Level.E;elsesco_Leve

20、l=Sco_Level.X;static void Output(Undergraduate udg)System.out.println("*本科生*");/System.out.println("");System.out.print("姓名");System.out.print('t'+"學生類型");System.out.print('t'+"C語言成績");System.out.print('t'+"英語成績");Sy

21、stem.out.print('t'+"Java成績");System.out.print('t'+"平均分");System.out.println('t'+"成績等級");for(int i=0; i<udg.length;i+)System.out.print(udgi.Name);System.out.print('t'+udgi.Stu_type);System.out.print('t'+String.valueOf(udgi.C_sco

22、re);System.out.print('t'+String.valueOf(udgi.English_score);System.out.print('t'+String.valueOf(udgi.Java_score);System.out.print('t'+String.valueOf(udgi.score);System.out.println('t'+udgi.sco_Level.getSignal();System.out.println();package Package_5;public class Postg

23、raduate extends Studentpublic Postgraduate(String name,String stu_type,int sco1,int sco2,int sco3)super(name,stu_type,sco1,sco2,sco3);if(score>=90&score<=100)sco_Level=Sco_Level.A;else if(score>=80&score<90)sco_Level=Sco_Level.B;else if(score>=70&score<80)sco_Level=Sco_

24、Level.C;else if(score>=60&score<70)sco_Level=Sco_Level.D;else if(score>=0&score<60)sco_Level=Sco_Level.E;elsesco_Level=Sco_Level.X;static void Output(Postgraduate pg)System.out.println("*研究生*");/System.out.println("");System.out.print("姓名");System.ou

25、t.print('t'+"學生類型");System.out.print('t'+"C語言成績");System.out.print('t'+"英語成績");System.out.print('t'+"Java成績");System.out.print('t'+"平均分");System.out.println('t'+"成績等級");for(int i=0; i<pg.le

26、ngth;i+)System.out.print(pgi.Name);System.out.print('t'+pgi.Stu_type);System.out.print('t'+String.valueOf(pgi.C_score);System.out.print('t'+String.valueOf(pgi.English_score);System.out.print('t'+String.valueOf(pgi.Java_score);System.out.print('t'+String.valueO

27、f(pgi.score);System.out.println('t'+pgi.sco_Level.getSignal();System.out.println();package Package_5;public class Test public static void main(String args) Undergraduate udg=new Undergraduate5;udg0=new Undergraduate("小明","本科生",80,95,79);udg1=new Undergraduate("小紅&quo

28、t;,"本科生",60,82,76);udg2=new Undergraduate("小白","本科生",90,49,67);udg3=new Undergraduate("小黑","本科生",56,74,65);udg4=new Undergraduate("小軍","本科生",68,81,84);Postgraduate pg=new Postgraduate5;pg0=new Postgraduate("小明","研究生

29、",80,95,79);pg1=new Postgraduate("小紅","研究生",60,82,76);pg2=new Postgraduate("小白","研究生",90,49,67);pg3=new Postgraduate("小黑","研究生",56,74,65);pg4=new Postgraduate("小軍","研究生",68,81,84);Undergraduate.Output(udg);Postgradu

30、ate.Output(pg);習題6的源代碼：package Package_6;public interface Sco_Level abstract String getLevel(int score);package Package_6;public class ugd_Level implements Sco_Levelpublic String getLevel(int score)String sco_Level=""if(score>=85&score<=100)sco_Level="優(yōu)秀"else if(score&g

31、t;=75&score<85)sco_Level="良好"else if(score>=65&score<75)sco_Level="中等"else if(score>=60&score<65)sco_Level="及格"else if(score>=0&score<60)sco_Level="不及格"elsesco_Level="未知等級"return sco_Level;package Package_6;public

32、 class pg_Level implements Sco_Levelpublic String getLevel(int score)String sco_Level=""if(score>=90&score<=100)sco_Level="優(yōu)秀"else if(score>=80&score<90)sco_Level="良好"else if(score>=70&score<80)sco_Level="中等"else if(score>=60&a

33、mp;score<70)sco_Level="及格"else if(score>=0&score<60)sco_Level="不及格"elsesco_Level="未知等級"return sco_Level;package Package_6;public abstract class Student String Name=""String Stu_type=""int C_score;int English_score;int Java_score;int scor

34、e;String sco_Level=""public Student(String name,String stu_type,int sco1,int sco2,int sco3)Name=name;Stu_type=stu_type;C_score=sco1;English_score=sco2;Java_score=sco3;score=(sco1+sco2+sco3)/3;package Package_6;public class Undergraduate extends Studentpublic Undergraduate(String name, Stri

35、ng stu_type, int sco1, int sco2,int sco3) super(name, stu_type, sco1, sco2, sco3);ugd_Level ugd_level=new ugd_Level();sco_Level=ugd_level.getLevel(score);static void Output(Undergraduate udg)System.out.println("*本科生*");/System.out.println("");System.out.print("姓名");Syst

36、em.out.print('t'+"學生類型");System.out.print('t'+"C語言成績");System.out.print('t'+"英語成績");System.out.print('t'+"Java成績");System.out.print('t'+"平均分");System.out.println('t'+"成績等級");for(int i=0; i<

37、udg.length;i+)System.out.print(udgi.Name);System.out.print('t'+udgi.Stu_type);System.out.print('t'+String.valueOf(udgi.C_score);System.out.print('t'+String.valueOf(udgi.English_score);System.out.print('t'+String.valueOf(udgi.Java_score);System.out.print('t'+St

38、ring.valueOf(udgi.score);System.out.println('t'+udgi.sco_Level);System.out.println();package Package_6;public class Postgraduate extends Studentpublic Postgraduate(String name, String stu_type, int sco1, int sco2,int sco3) super(name, stu_type, sco1, sco2, sco3);/ TODO Auto-generated constru

39、ctor stubpg_Level pg_level=new pg_Level();sco_Level=pg_level.getLevel(score);static void Output(Postgraduate pg)System.out.println("*研究生*");/System.out.println("");System.out.print("姓名");System.out.print('t'+"學生類型");System.out.print('t'+"C

40、語言成績");System.out.print('t'+"英語成績");System.out.print('t'+"Java成績");System.out.print('t'+"平均分");System.out.println('t'+"成績等級");for(int i=0; i<pg.length;i+)System.out.print(pgi.Name);System.out.print('t'+pgi.Stu_ty

41、pe);System.out.print('t'+String.valueOf(pgi.C_score);System.out.print('t'+String.valueOf(pgi.English_score);System.out.print('t'+String.valueOf(pgi.Java_score);System.out.print('t'+String.valueOf(pgi.score);System.out.println('t'+pgi.sco_Level);System.out.prin

42、tln();package Package_6;public class Test public static void main(String args) Undergraduate udg=new Undergraduate5;udg0=new Undergraduate("小明","本科生",25,95,74);udg1=new Undergraduate("小紅","本科生",60,82,82);udg2=new Undergraduate("小白","本科生",64,49,27);udg3=new Undergraduate("小黑","本科生",94,77,89);udg4=new Undergraduate("小軍","