有关java编程题目？

按照题目要求编写的圆,圆锥和测试类的Java程序如下

Test.java文件内容如下

class Circle{

private double r

private String color

public Circle(double r){

this.r=r

}

public double area(){

return Math.PI*r*r

}

public double perimeter(){

return Math.PI*2*r

}

public double getR(){

return this.r

}

public void setR(double r){

this.r=r

}

public String getColor(){

return this.color

}

public void setColor(String color){

this.color=color

}

public String toString(){

return "圆的半径为"+r+",颜色为"+color

}

}

class Cone{

private Circle c

private double h

private String color

public Cone(Circle c,double h){

this.c=c

this.h=h

}

public double volume(){

return 1.0/3*c.area()*h

}

public Circle getCircle(){

return this.c

}

public void setCircle(Circle c){

this.c=c

}

public double getH(){

return this.h

}

public void setH(double h){

this.h=h

}

public String getColor(){

return this.color

}

public void setColor(String color){

this.color=color

}

public String toString(){

return "圆锥的底面积为"+c.area()+",高为"+h+",颜色为"+color

}

}

public class Test{

public static void main(String[] args){

Circle circle1=new Circle(2.5)

circle1.setColor("红色")

System.out.println(circle1.toString())

System.out.println("圆的面积为"+circle1.area())

System.out.println("圆的周长为"+circle1.perimeter())

Cone circlar1=new Cone(circle1,2.7)

circlar1.setColor("蓝色")

System.out.println(circlar1.toString())

System.out.println("圆锥的体积为"+circlar1.volume())

}

}

public class Person {

private String name//姓名

private String sex//性别

public void sayHello() {

System.out.println("姓名：" + name)

System.out.println("性别：" + sex)

}

public Person() {

}

public Person(String name, String sex) {

this.name = name

this.sex = sex

}

public String getName() {

return name

}

public void setName(String name) {

this.name = name

}

public String getSex() {

return sex

}

public void setSex(String sex) {

this.sex = sex

}

}

public class Student extends Person {

private String num//学号

private String school//学校

public void sayHello() {

super.sayHello()

System.out.println("学号：" + num)

System.out.println("学校：" + school)

}

public Student(String num, String school) {

this.num = num

this.school = school

}

public Student(String name, String sex, String num, String school) {

super(name, sex)

this.num = num

this.school = school

}

public Student() {

}

public String getNum() {

return num

}

public void setNum(String num) {

this.num = num

}

public String getSchool() {

return school

}

public void setSchool(String school) {

this.school = school

}

}

public class Test {

public static void main(String[] args) {

Student stu1 = new Student()

stu1.setName("张三")

stu1.setSex("男")

stu1.setNum("20211225001")

stu1.setSchool("北京大学")

Student stu2 = new Student("20211225002", "北京大学")

stu2.setName("李四")

stu2.setSex("男")

Student stu3 = new Student("王五", "女", "20211225003", "清华大学")

Person person1 = new Person()

person1.setName("赵六")

person1.setSex("女")

Person person2 = new Person("孙七", "女")

stu1.sayHello()

stu2.sayHello()

stu3.sayHello()

person1.sayHello()

person2.sayHello()

}

}

这种作业，最好还是结合书上知识，理解清楚老师布置的目的、怎么实现的

public class Frog {

private String name

private Integer distance = 0

//跳跃方法

void jump() {

//随机10-20

int jumpDistance = (int) (10 + Math.random() * (20 - 10 + 1))

this.distance += jumpDistance

}

//带名字构造方法

Frog(String name) {

this.name = name

}

public static void main(String[] args) {

Frog a = new Frog("a")

Frog b = new Frog("b")

Frog c = new Frog("c")

Frog d = new Frog("d")

for (int i = 0i <10i++) {

a.jump()

b.jump()

c.jump()

d.jump()

}

System.out.println(a.name + "总距离=" + a.distance)

System.out.println(b.name + "总距离=" + b.distance)

System.out.println(c.name + "总距离=" + c.distance)

System.out.println(d.name + "总距离=" + d.distance)

}

public String getName() {

return name

}

public void setName(String name) {

this.name = name

}

public Integer getDistance() {

return distance

}

public void setDistance(Integer distance) {

this.distance = distance

}

}

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