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1、l 分析学生管理系统涉及到学生类，声明该类。属性：学号、姓名、年龄、计算机成绩、数学成绩、英语成绩；类变量学号最大值（或最后一个学生的学号），每次新建学生对象时，为其分配学号，学号等于学号最大值加1；实现计算平均成绩、总成绩的功能。代码：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)this.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()return com
3、putergrade ;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 compute
4、rgrade,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 englishgrade) puterg
5、rade = 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(“学生ID：”+S1.studentID) ;/S1.St
6、udent() ;S1.setName(LHJ) ;System.out.println(“姓名：”+S1.getName() ;S1.setAge(20) ;System.out.println(“年龄：”+S1.getAge() ; S1.setComputerGrade(96.50) ;System.out.println(“计算机成绩：”+S1.getComputerGrade() ;S1.setMathGrade(98.00) ;System.out.println(“数学成绩：”+S1.getMathGrade() ;S1.setEnglishGrade(99.50) ;Syste
7、m.out.println(“英语成绩：”+S1.getEnglishGrade() ;S1.setSumGrade(96.50,98.00,99.50) ;System.out.println(“总成绩：”+S1.getSumGrade() ;S1.setAvgGrade(96.50,98.00,99.50) ;System.out.println(“平均成绩：”+S1.getAvgGrade() ;l 现在要求定义一个表示雇员的类，属性：雇员编号、姓名、职位、基本工资、奖金；类变量雇员编号最大值（或最后一个雇员的编号），每次新建雇员对象时，为其分配编号，编号等于编号最大值加1；要求可以取得
8、一个雇员的完整信息，也可以求出一个雇员的月薪和年薪等信息。代码：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)this.name = name ;public String getName()return n
9、ame ;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 = reward ;public double g
10、etMonthPay()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() ;System.out.println(“员工
11、ID：”+E1.employeeID) ;E1.setName(LHJ) ;System.out.println(“姓名：”+E1.getName() ;E1.setAge(27) ;System.out.println(“年龄：”+E1.getAge() ;E1.setPosition(技术总监) ;System.out.println(“职位：”+E1.getPosition() ;E1.setMonthPay(30000,9000) ;System.out.println(”月薪：”+E1.getMonthPay() ;E1.setYearPay(30000,9000) ;System.
12、out.println(“年薪：”+E1.getYearPay() ;Employee E2 = new Employee() ;System.out.println(“员工ID：”+E1.employeeID) ;E1.setName(LJ) ;System.out.println(“姓名：”+E1.getName() ;E1.setAge(28) ;System.out.println(“年龄：”+E1.getAge() ;E1.setPosition(程序员) ;System.out.println(“职位：”+E1.getPosition() ;E1.setMonthPay(1500,
13、900) ;System.out.println(“月薪：”+E1.getMonthPay() ;E1.setYearPay(1500,900) ;System.out.println(“年薪”+E1.getYearPay() ;l 声明并测试一个复数类,其方法包括toString()及复数的加、减、乘、除运算代码：public class Complex private int readNumber; private int imaginaryUnit; Complex(int readNumber, int imaginaryUnit) this.readNumber = readNumb
14、er; this.imaginaryUnit = imaginaryUnit; public Complex Add(Complex c1,Complex c2) Complex c = new Complex() c.readNumber = c1.readNumber + c2.readNumber; c.imaginaryUnit = c1.imaginaryUnit + c2.imaginaryUnit; return c; public void Add(Complex c1) this.readNumber += c1.readNumber; this.imaginaryUnit += c1.imaginaryUnit; ToString() return this.readNumber.ToString() + + + this.imaginaryUnit.ToString() + i ;