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())
}
}
以下是一个简单的HTML网页，包含一个文本框和一个按钮，点击按钮后，将文本框中的文字改变为红色：
<!DOCTYPE html>
<html>
<head> <title>修改文本框颜色</title>
<script> function changeColor() {
var text = document.getElementById("text").value document.getElementById("text").style.color = "red"
} </script>
</head> <body>
<input type="text" id="text"><br><br> <button onclick="changeColor()">确定</button> </body></html>
这个网页包含两个元素：一个输入框和一个按钮。点击按钮后，调用changeColor()函数，该函数首先获取文本框中的文本，然后将其颜色设置为红色，从而实现了修改文本框颜色的功能。
你可以将上述代码复制到文本编辑器中，保存为HTML文件，然后在浏览器中打开该文件，即可看到实现的效果。
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()
}
}
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