Java程序设计题目

3， 文件名：Three.java

public class Three {

public static void main(String[] args) {

Student stu = new Student("Zhang San", true, (short)12)

System.out.println("Student name: " + stu.name)

System.out.println("Student is a male?: " + stu.sex)

System.out.println("Student's age: " + stu.age)

stu.work()

stu.study()

Teacher teacher = new Teacher()

teacher.learnMoney()

}

}

abstract class Person{//抽象类Person

protected String name

protected boolean sex

protected short age

protected abstract void work()//work抽象方法

}

interface Learnmoney{//Learnmoney接口

public void learnMoney()

}

interface Study{//Study接口

public void study()

}

class Student extends Person implements Study{//Student类

public void work() {

System.out.println("学生的工作是努力学习")

}

public Student(String name, boolean sex, short age){

super.name = name

super.sex = sex

super.age = age

}

public void study() {

System.out.println("学生正在学习")

}

}

class Teacher extends Person implements Learnmoney{

public void work() {

System.out.println("教师的工作是教书育人")

}

public void learnMoney() {

System.out.println("教师正在赚钱")

}

}

class Docotor extends Person implements Learnmoney{

public void work() {

System.out.println("医生的职责是救死扶伤")

}

public void learnMoney() {

System.out.println("医生正在赚钱")

}

}

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4文件名：Four.java

public class Four {

public static void main(String[] args) {

Rectangle r = new Rectangle(3, 4)

System.out.println("Area is : " + r.area())

System.out.println("Circle is: " + r.circle())

}

}

class Rectangle{

private double width

private double height

public Rectangle(double width, double height){

this.width = width

this.height = height

}

public double circle(){//求周长

return (width + height) * 2

}

public double area(){//求面积

return width * height

}

}

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5Five.java

public class Five {

public static void main(String[] args) {

AImpl a = new AImpl()

a.paint()

}

}

interface A {

public int method1(int x)

public int method2(int x, int y)

}

class AImpl implements A{

public int method1(int x) {

return (int)Math.pow(x, 5)

}

public int method2(int x, int y) {

return x >y? x: y

}

public void paint(){

int result1 = method1(2)

int result2 = method2(2, 8)

System.out.println("method1(2) = " + result1)

System.out.println("method2(2, 8) = " + result2)

}

}

-----------------------------测试

method1(2) = 32

method2(2, 8) = 8

第一题看的脑壳疼，但是和第二题的意思差不多，我帮你做了第二题

public class List {

public static void main(String[] args) {

Employee e1 = new Employee("张强","2010/09/01",6890)

e1.show("普通")

System.out.println("年纳税："+e1.tax())

Manager m1 = new Manager("朱慧","2003/07/06",18530,38000)

m1.show("管理")

System.out.println("年纳税："+m1.tax())

}

}

//下面是补全的代码

class Employee{

String name,date

double salary,bonus

Employee(String name,String date,double salary){

this.name = name

this.date = date

this.salary = salary

}

public void show(String str){

System.out.println("岗位:"+str)

System.out.println("姓名:"+name+",入职时间:"+date+",月薪:"+salary)

}

public double tax(){

if(salary <= 0){

throw new RuntimeException("工资不允许小于等于0")

}

else if(salary>3000 && salary<=5000){

salary = salary*0.05*12 //纳税这里我也不知道他们具体是怎么个算法，反正意思差不多，套进去就行了

}

else if(salary>5000 && salary<=10000){

salary = salary*0.1*12

}

else if(salary>10000 && salary<=15000){

salary = salary*0.15*12

}

else if(salary>15000){

salary = salary*0.2*12

}

return salary+(bonus*0.2)

}

}

class Manager extends Employee{

Manager(String name,String date,double salary,double bonus){

super(name,date,salary)

super.bonus = bonus

}

public void show(String str){

System.out.println("岗位:"+str)

System.out.println("姓名:"+name+",入职时间:"+date+",月薪:"+salary+",奖金:"+bonus)

}

}

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