java 第五周实验【报告1】

public class TestTriangle {

private double a,b,c;

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

TestTriangle(){
this.a = 6;
this.b = 8;
this.c = 10;
}

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

public double get_Area(double a,double b,double c){
return (this.a+this.b+this.c);

}

public double get_Perimer(double a,double b,double c){
double s;
s=(this.a+this.b+this.c)/2;
return(Math.sqrt(s*(s-this.a)*(s-this.b)*(s-this.c)));
}

public boolean is_Triangle(double a,double b,double c)
{
if(this.a+this.b>this.c&&this.a+this.c>this.b&&this.c+this.b>this.a)
{
System.out.println("是三角形");
return true;
}
else{
System.out.println("不是三角形");
return false;
}
}

public static void main(String[] args) {
TestTriangle t = new TestTriangle();
t.get_Area(3,4,5);
t.is_Triangle(3,4,5);
t.get_Perimer(3,4,5);
double c,x;
c=t.get_Area(3, 4, 5);
x=t.get_Perimer(3,4,5);

System.out.println("面积为 "+c+"   周长为 "+x);
}

}