Java初級面向對象練習題

1、l 分析學生管理系統(tǒng)涉及到學生類，聲明該類。屬性：學號、姓名、年齡、計算機成績、數學成績、英語成績；類變量學號最大值（或最后一個學生的學號），每次新建學生對象時，為其分配學號，學號等于學號最大值加1；實現計算平均成績、總成績的功能。代碼：class Studentpublic static int studentID = 0 ;private String name ;private int age ;private double computergrade ;private double mathgrade ;private double englishgrade ;public Stude

2、nt()this.studentID+ ;public void setName(String name) = name ;public String getName()return name ;public void setAge(int age)this.age = age ;public int getAge()return age ;public void setComputerGrade(double coputergrade)putergrade = computergrade ;public double getComputerGrade()re

3、turn computergrade ;public void setMathGrade(double mathgrade)this.mathgrade = mathgrade ;public double getMathGrade()return mathgrade ;public void setEnglishGrade(double englishgrade)this.englishgrade = englishgrade ;public double getEnglishGrade()return englishgrade ;public void setSumGrade(double

4、 computergrade,double mathgrade,double englishgrade) putergrade = computergrade ;this.mathgrade = mathgrade ;this.englishgrade = englishgrade ;public double getSumGrade()return computergrade + mathgrade + englishgrade ;public void setAvgGrade(double computergrade,double mathgrade,double engl

5、ishgrade) putergrade = computergrade ;this.mathgrade = mathgrade ;this.englishgrade = englishgrade ;public double getAvgGrade()return (computergrade + mathgrade + englishgrade)/3 ;public class JavaDemo01public static void main (String args)Student S1 = new Student() ;System.out.println(“學生ID

6、：”+S1.studentID) ;/S1.Student() ;S1.setName(LHJ) ;System.out.println(“姓名：”+S1.getName() ;S1.setAge(20) ;System.out.println(“年齡：”+S1.getAge() ; S1.setComputerGrade(96.50) ;System.out.println(“計算機成績：”+S1.getComputerGrade() ;S1.setMathGrade(98.00) ;System.out.println(“數學成績：”+S1.getMathGrade() ;S1.setEn

7、glishGrade(99.50) ;System.out.println(“英語成績：”+S1.getEnglishGrade() ;S1.setSumGrade(96.50,98.00,99.50) ;System.out.println(“總成績：”+S1.getSumGrade() ;S1.setAvgGrade(96.50,98.00,99.50) ;System.out.println(“平均成績：”+S1.getAvgGrade() ;l 現在要求定義一個表示雇員的類，屬性：雇員編號、姓名、職位、基本工資、獎金；類變量雇員編號最大值（或最后一個雇員的編號），每次新建雇員對象時，為

8、其分配編號，編號等于編號最大值加1；要求可以取得一個雇員的完整信息，也可以求出一個雇員的月薪和年薪等信息。代碼：class Employeepublic static int employeeID = 0 ;private String name ;private int age ;private String position ;private double salary ;private double reward ;public Employee()employeeID+ ;public void setName(String name) = name ;public

9、String getName()return name ;public void setAge(int age)this.age = age ;public int getAge()return age ;public void setPosition(String position)this.position = position ;public String getPosition()return position ;public void setMonthPay(double salary,double reward)this.salary = salary ;this.reward =

10、 reward ;public double getMonthPay()return salary + reward ;public void setYearPay(double salary,double reward)this.salary = salary ;this.reward = reward ;public double getYearPay()return (salary + reward) * 12 ;public class JavaDemo00public static void main (String args)Employee E1 = new Employee()

11、 ;System.out.println(“員工ID：”+E1.employeeID) ;E1.setName(LHJ) ;System.out.println(“姓名：”+E1.getName() ;E1.setAge(27) ;System.out.println(“年齡：”+E1.getAge() ;E1.setPosition(技術總監(jiān)) ;System.out.println(“職位：”+E1.getPosition() ;E1.setMonthPay(30000,9000) ;System.out.println(”月薪：”+E1.getMonthPay() ;E1.setYear

12、Pay(30000,9000) ;System.out.println(“年薪：”+E1.getYearPay() ;Employee E2 = new Employee() ;System.out.println(“員工ID：”+E1.employeeID) ;E1.setName(LJ) ;System.out.println(“姓名：”+E1.getName() ;E1.setAge(28) ;System.out.println(“年齡：”+E1.getAge() ;E1.setPosition(程序員) ;System.out.println(“職位：”+E1.getPosition

13、() ;E1.setMonthPay(1500,900) ;System.out.println(“月薪：”+E1.getMonthPay() ;E1.setYearPay(1500,900) ;System.out.println(“年薪”+E1.getYearPay() ;l 聲明并測試一個復數類,其方法包括toString()及復數的加、減、乘、除運算代碼：public class Complex private int readNumber; private int imaginaryUnit; Complex(int readNumber, int imaginaryUnit) this.readNumber = readNumber; this.imaginaryUnit = imaginaryUnit; public Complex Add(Complex c1,Complex c2) Complex c = new Complex() c.readNumber = c1.readNumber + c2.readNumber; c.imaginaryUnit = c1.imaginaryUnit + c