Question

用JAVA编写一个应用程序

用JAVA编写一个应用程序，该程序有3个类：Lader、Circle和主类A具体要求如下：Lader类具有类型为double的上底、下底、高、面积属性，具有返回面积的功能，包括一个构造方法对上底、下底、高进行初始化。Circle类具有类型为double的半径、周长和面积属性，具有返回周长、面积的功能，包括一个构造方法对半径进行初始化。主类A用来测试类Lader和类Circle的功能，…………这个怎么做啊，求教导

Answer 1

//Lader类
class Lader {
double shangDi; //上底
double xiaDi; //下底
double heigth; //高
double area; //面积

//下面是构造方法
public Lader(double shangDi,double xiaDi,double heigth){
this.shangDi=shangDi;
this.xiaDi=xiaDi;
this.heigth=heigth;
}
//下面是求面积
public double getArea(){
return (shangDi+xiaDi)*heigth/2;
}
}
//Circle类
class Circle{
double r; //半径
double l; //周长
double area; //面积
public static final double PI=3.1415926;

//下面是构造方法
public Circle(double r){
this.r=r;
}
//得到周长
public double getL(){
return 2*PI*r;
}
//得到面积
public double getArea(){
return 2*PI*r*r;
}

}
//A 主类
public class A{
public static void main(String[] args) {
Lader lader = new Lader(2.00,3.00,2.00); //三个参数分别是上底 下底 高
Circle circle = new Circle(3.00); //参数是圆的半径
System.out.println("面积是"+lader.getArea());
System.out.println("圆形周长是"+circle.getL());
System.out.println("圆形面积是"+circle.getArea());
}
}

注释我都写明了
应该自己试试 很简单 不敲永远不会

Answer 2

public class TestClass {
public static void main(String[] args) {
Lader lader = new Lader(5, 10, 10);
lader.setMianji();
System.out.println("Lader de mianji: " + lader.getMianji());

Circle circle = new Circle(10);
circle.setZhouchang();
circle.setMianji();
System.out.println("Circle de zhouchang: " + circle.getZhouchang());
System.out.println("Circle de mianji: " + circle.getMianji());
}
}

class Lader {
private double shangdi;
private double xiadi;
private double gao;
private double mianji;

public Lader(double shangdi, double xiadi, double gao) {
this.shangdi = shangdi;
this.xiadi = xiadi;
this.gao = gao;
}

public double getMianji() {
return mianji;
}

public void setMianji() {
this.mianji = (shangdi + xiadi) * gao / 2;
}
}

class Circle {
private double banjing;
private double zhouchang;
private double mianji;

public Circle(double banjing) {
this.banjing = banjing;
}

public void setZhouchang() {
this.zhouchang = 2 * Math.PI * banjing;
}

public double getZhouchang() {
return this.zhouchang;
}

public void setMianji() {
this.mianji = Math.PI * banjing * banjing;
}

public double getMianji() {
return this.mianji;
}
}
希望对你有所帮助。。。

Answer 3

这么基础的东西。哎