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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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