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标题: Shape抽象类 Trangle Rectangle Circle 子类计算周长和面积 [打印本页]

作者: java无忧网 时间: 2020-11-21 14:35
标题: Shape抽象类 Trangle Rectangle Circle 子类计算周长和面积

public class Test {

public static void main(String[] args) {
double a = 4, b = 5, c = 6;
//三角形
Trangle t = new Trangle(a, b, c);
double area = t.getArea(a, b);
double perimeter = t.getPerimeter();
System.out.println("三角形的面积是: " + area);
System.out.println("三角形的周长是:" + perimeter);
System.out.println("是否组成三角形:"+t.isXJX());

//矩形
a = 3;
b = 4;
Tectangle r = new Tectangle();
area = r.getArea(a, b);
perimeter = r.getPerimeter(a, b);
System.out.println("矩形的面积是： " + area);
System.out.println("矩形的周长是： " + perimeter);

//圆形
Circle circle = new Circle(5);
area = circle.getArea(3, 3);
perimeter = circle.getPerimeter();
System.out.println("圆形的面积是： " + area);
System.out.println("圆形的周长是： " + perimeter);

}

}

abstract class Shape {
public abstract double getArea(double a,double b);
public double getPerimeter(double a,double b,double c){
      return a+b+c;
}

}

class Trangle extends Shape{
private double a;

private double b;

private double c;

private double perimeter;

private double area;

public Trangle(double a, double b, double c) {
         this.a = a;
         this.b = b;
         this.c = c;
}

public double getPerimeter(){
         perimeter= a+b+c;
         return perimeter;
}

public double getArea(double a,double b){
         double p=(a+b+c)/2;
         area= Math.sqrt(p*(p-a)*(p-b)*(p-c));
         return area;
}

public boolean isXJX(){
if(a+b>c){
return true;
}else if(a+c>b){
return true;
}else if(b+c>a){
return true;
}
return false;
}

}

class Tectangle extends Shape{
private double a,b;
private double perimeter;

      private double area;
public double getArea(double a,double b){
         area= a*b;
         return area;
}
public double getPerimeter(double a,double b){
         perimeter= (a+b)*2;
         return perimeter;
}
}

class Circle extends Shape{

private double r;

private double perimeter;

private double area;

public Circle(double radius) {

         this.r = radius;

}

public Circle() {

}

public double getPerimeter(){
         perimeter=2*Math.PI*r;
         return perimeter;
}

public double getArea(double a,double b){

      area=Math.PI*r*r;
      return area;
}
}

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