设计一个类Triangle，它有三个double型属性；
1个回答
class Triangle{
public double a;
public double b;
public double c;
public Triangle(){
a=0.0;
b=0.0;
c=0.0;
}
public Triangle(double a,double b,double c){
this.a=a;
this.b=b;
this.c=c;
}
private boolean isTrue(){
if(a+b>c&&a+c>b&&b+c>a)return true;
else return false;
}
public double getPerimeter(){
if(this.isTrue())return a+b+c;
else return -1;
}
public double getArea(){
double s=(a+b+c)/2;
if(this.isTrue())return Math.sqrt(s*(s-a)*(s-b)*(s-c));
else return -1;
}
public static void main(String[] args){
Trangle t=new Trangle();
System.out.println(t.getPerimeter());
System.out.println(t.getArea());
Trangle q=new Trangle(1.2,1.2,1.2);
System.out.println(q.getPerimeter());
System.out.println(q.getArea());
}
}
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