java实验报告——继承与接口.doc

成绩： 面向对象原理与Java实践课程实验报告实验2：继承与接口姓 名 _ _ 班 级 _ _ 学 号 _ _ 实验地点 _ _ 实验时间 _ _ 指导教师 _ _ 一、实验目的：l 掌握类的继承机制，掌握成员变量的隐藏与方法的重写l 掌握接口的定义和实现方法二、实验要求：l 复习类的继承以及接口的设计方法l 注意保证类的封装性l 编写程序完成以下实验内容并上交实验报告三、实验内容：1、P153：习题42、P153：习题53、P153：习题64、在程序包packageOne中编写至少含一个方法的公有接口InterfaceOne。在程序包packageTwo中定义公有类SuperClass，该类含有一个受保护的内部类InnerClass，这个类实现接口InterfaceOne。在程序包packageThree中定义公有类SubClass继承SuperClass，类SubClass定义一个返回类型为InterfaceOne的方法返回内部类InnerClass的对象实例。请正确使用程序包组织以上类和接口，编译并运行，并观察编译器生成的字节码文件的命名方式。四、设计思路：习题4的设计思路是设计一个抽象类作为父类，并设计相关字段以及计算成绩等级的抽象方法，然后再设计本科生类和研究生类作为子类继承，并且各自实现其计算成绩等级的抽象方法，最终将结果输出。习题5的设计思路跟习题4相同，只需额外设计一个枚举类存储学生的成绩等级，并对相关代码作少许修改即可。习题6的设计思路是习题4的延伸，在习题4的类结构基础上，将原来的计算成绩等级的抽象方法提取出来，放在一个公有接口中，然后再分别设计计算本科生和研究生成绩等级的类实现接口的抽象方法。五、程序源代码：习题4的源代码：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_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,int sco1,int sco2,int sco3)super(name,stu_type,sco1,sco2,sco3);if(score=85&score=75&score=65&score=60&score=0&score60)sco_Level=不及格;elsesco_Level=未知等级;static void Output(Undergraduate udg)System.out.println(*本科生*);/System.out.println();System.out.print(姓名);System.out.print(t+学生类型);System.out.print(t+C语言成绩);System.out.print(t+英语成绩);System.out.print(t+Java成绩);System.out.print(t+平均分);System.out.println(t+成绩等级);for(int i=0; i=90&score=80&score=70&score=60&score=0&score60)sco_Level=不及格;elsesco_Level=未知等级;static void Output(Postgraduate pg)System.out.println(*研究生*);/System.out.println();System.out.print(姓名);System.out.print(t+学生类型);System.out.print(t+C语言成绩);System.out.print(t+英语成绩);System.out.print(t+Java成绩);System.out.print(t+平均分);System.out.println(t+成绩等级);for(int i=0; i=85&score=75&score=65&score=60&score=0&score60)sco_Level=Sco_Level.E;elsesco_Level=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+学生类型);System.out.print(t+C语言成绩);System.out.print(t+英语成绩);System.out.print(t+Java成绩);System.out.print(t+平均分);System.out.println(t+成绩等级);for(int i=0; i=90&score=80&score=70&score=60&score=0&score60)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.out.print(t+学生类型);System.out.print(t+C语言成绩);System.out.print(t+英语成绩);System.out.print(t+Java成绩);System.out.print(t+平均分);System.out.println(t+成绩等级);for(int i=0; i=85&score=75&score=65&score=60&score=0&score=90&score=80&score=70&score=60&score=0&score60)sco_Level=不及格;elsesco_Level=未知等级;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 score;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, String 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);System.out.print(t+学生类型);System.out.print(t+C语言成绩);System.out.print(t+英语成绩);System.out.print(t+Java成绩);System.out.print(t+平均分);System.out.println(t+成绩等级);for(int i=0; iudg.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+String.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 constructor 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+学生类型);System.out.print(t+C语言成绩);System.out.print(t+英语成绩);System.out.print(t+Java成绩);System.out.print(t+平均分);System.out.println(t+成绩等级);for(int i=0; ipg.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(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_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(小红,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(小军,本科生,91,84,73);Postgraduate pg=new Postgraduate5;pg0=new Postgraduate(小明,本科生,25,95,74);pg1=new Postgraduate(小红,本科生,60,82,82);pg2=new Postgraduate(小白,本科生,64,49,27);pg3=new Postgraduate(小黑,本科生,94,77,89);pg4=new Postgraduate(小军,本科生,91,84,73);Undergraduate.Output(udg);Postgraduate.Output(pg);第4题的源代码：package PackageOne;public interface InterfaceOne void OutPut();package PackageOne;import PackageThree.SubClass;public class test public static void main(String args) SubClass sc=new SubClass();InterfaceOne ifo= sc.getInnerclass();ifo.OutPut();package PackageThree;import PackageOne.InterfaceOne;imp