Java語言程序設(shè)計(jì)（選修課）

1、類與對(duì)象的基礎(chǔ)題：1）編程實(shí)現(xiàn)：設(shè)計(jì)一個(gè)學(xué)生類student，包含的屬性有姓名name和年齡age. 由學(xué)生類派生出本科生類undergraduate和研究生類postgraduate, 本科生類包含的屬性有專業(yè)specialty等, 研究生類包含的屬性有研究方向studydirection等。每個(gè)類都有相關(guān)數(shù)據(jù)的set方法和get方法.2）聲明測(cè)試類：聲明student類的數(shù)組（含5個(gè)元素），生成五個(gè)對(duì)象存入數(shù)組：其中二個(gè)student類的對(duì)象、二個(gè)postgraduate類的對(duì)象、一個(gè)undergraduate類的對(duì)象，打印輸出每個(gè)對(duì)象的某個(gè)成員變量。將一個(gè)父類的引用指向一個(gè)子類對(duì)象，用這

2、個(gè)塑型后的對(duì)象來調(diào)用某個(gè)方法實(shí)現(xiàn)多態(tài)性。/聲明學(xué)生類 studentclass studentprivate string name;/姓名private int age;/年齡/構(gòu)造方法public student()public student(string name, int age) = name;this.age = age;/get方法public string getname()return ;public int getage() return this.age;/set方法public void setname(string name)t

3、=name; public void setage(int age) this.age = age;public void study() system.out.println(普通學(xué)生);/聲明本科生類 undergraduateclass undergraduate extends studentpublic string specialty;/專業(yè)/構(gòu)造方法public undergraduate() public undergraduate(string name, int age, string specialty)super(name, age); this.spe

4、cialty = specialty; /get方法public string getspecialty() return this.specialty;/set方法public void setspecialty() this.specialty = specialty; public void study() system.out.println(本科生); /聲明研究生類 postgraduateclass postgraduate extends studentpublic string studydirection;/研究方向/構(gòu)造方法public postgraduate() pu

5、blic postgraduate(string name, int age, string studydirection) super(name, age); this.studydirection = studydirection;/get方法public string getstudydirection() return studydirection;/set方法public void setstudydirection() this.studydirection = studydirection; public void study() system.out.println(研究生);

6、/聲明測(cè)試類 testerpublic class testerpublic static void main(string args) int i; student student = new student5; student0 = new student(li mei, 15); student1 = new student(wang hai, 18); student2 = new postgraduate(wu fan, 24, 法學(xué)); student3 = new postgraduate(zhang jie, 25, 物理學(xué)); student4 = new undergraduate(huang yue, 20, 微電子學(xué)); for(i=0; istudent.length; i+) system.out.println(姓名： + studenti.getname()+ +年齡：+studenti.getage(); student stu = new postgraduat