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伊水和俺 2017-06-26
- 打赏
- 举报
代码如下：package geometrycalculator;
/**
*
* @author Administrator
*/
public abstract class Shape {
public abstract void Circum();
public abstract void Area();
}
package geometrycalculator;
/**
*
* @author Administrator
*/
public class Circle extends Shape {
protected double r;
public Circle(double r) {
this.r = r;
}
public void Circum() {
System.out.println("圆的周长为：" + 2 * r * Math.PI);
}
public void Area() {
System.out.println("圆的面积为：" + Math.PI * r * r);
}
}
package geometrycalculator;
/**
*
* @author Administrator
*/
public class Rectangle extends Shape {
protected double len;
protected double wid;
public Rectangle(double len, double wid) {
this.len = len;
this.wid = wid;
}
public void Circum() {
System.out.println("矩形的周长为：" + (2 * (len + wid)));
}
public void Area() {
System.out.println("矩形的面积为：" + len * wid);
}
}
package geometrycalculator;
/**
*
* @author Administrator
*/
public class Triangle extends Shape {
protected double a;
protected double b;
protected double c;
public Triangle(double a, double b, double c) {
this.a = a;
this.b = b;
this.c = c;
}
public void Circum() {
System.out.println("三角形的周长为：" + (a + b + c));
}
public void Area() {
double p = (a + b + c) / 2;
System.out.println("三角形的面积为：" + (Math.sqrt(p)) * (p - a) * (p - b) * (p - c));
}
}
package geometrycalculator;
import java.util.Scanner;
/**
*
* @author Administrator
*/
public class GeometryCalculator {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.print("请输入图形的边长或半径,以空格分开：");
Shape s;
double a, b, c;
String str = scan.nextLine();
String dig[] = str.split(" ");
if (dig.length == 1) {
a = Double.parseDouble(dig[0]);
s = new Circle(a);
s.Circum();
s.Area();
} else if (dig.length == 2) {
a = Double.parseDouble(dig[0]);
b = Double.parseDouble(dig[1]);
s = new Rectangle(a, b);
s.Circum();
s.Area();
} else {
a = Double.parseDouble(dig[0]);
b = Double.parseDouble(dig[1]);
c = Double.parseDouble(dig[2]);
s = new Triangle(a, b, c);
s.Circum();
s.Area();
}
}
}
