class Trangle
{
double sideA,sideB,sideC,area,length;
boolean boo;
public Trangle(double a,double b,double c)
{
sideA=a;
sideB=b;
sideC=c;
if(a+b>c&&a+c>b&&b+c>a)
{
boo=true;
}
else
{
boo=false;
}
}
double getLength()
{
return (sideA+sideB+sideC);
}
public double getArea()
{
if(boo)
{
double p=(sideA+sideB+sideC)/2.0;
area=Math.sqrt(p*(p-sideA)*(p-sideB)*(p-sideC)) ;
return area;
}
else
{
System.out.println("不是一个三角形,不能计算面积");
return 0;
}
}
public void setABC(double a,double b,double c)
{
sideA=a;
sideB=b;
sideC=c;
if(a+b>c&&a+c>b&&b+c>a)
{
boo=true;
}
else
{
boo=false;
}
}
}
class Lader
{
double above,bottom,height,area;
Lader(double a,double b,double h)
{
above=a;
bottom=b;
height=h;
}
double getArea( )
{
double area=(above+bottom)*height/2.0;
return area;
}
}
class Circle
{
double radius,area;
Circle(double r)
{
radius=r;
}
double getArea( )
{
double area=3.14*radius*radius;
return area;
}
double getLength( )
{
double length=2*3.14*radius;
return length;
}
void setRadius(double newRadius)
{
radius=newRadius;
}
double getRadius( )
{
return radius;
}
}
public class AreaAndLength
{
public static void main(String args[ ])
{
double length,area;
Circle circle=null;
Trangle trangle;
Lader lader;
circle=new Circle(5);
trangle=new Trangle(3,4,5);
lader=new Lader(3,4,5);
length=circle.getLength();
System.out.println("圆的周长:"+length);
area=circle.getArea();
System.out.println("圆的面积:"+area);
length=trangle.getLength();
System.out.println("三角形的周长:"+length);
area=trangle.getArea();
System.out.println("三角形的面积:"+area);
area=lader.getArea();
System.out.println("梯形的面积:"+area);
trangle.setABC(12,34,1);
area=trangle.getArea();
System.out.println("三角形的面积:"+area);
length=trangle.getLength();
System.out.println("三角形的周长:"+length);
}
{
double sideA,sideB,sideC,area,length;
boolean boo;
public Trangle(double a,double b,double c)
{
sideA=a;
sideB=b;
sideC=c;
if(a+b>c&&a+c>b&&b+c>a)
{
boo=true;
}
else
{
boo=false;
}
}
double getLength()
{
return (sideA+sideB+sideC);
}
public double getArea()
{
if(boo)
{
double p=(sideA+sideB+sideC)/2.0;
area=Math.sqrt(p*(p-sideA)*(p-sideB)*(p-sideC)) ;
return area;
}
else
{
System.out.println("不是一个三角形,不能计算面积");
return 0;
}
}
public void setABC(double a,double b,double c)
{
sideA=a;
sideB=b;
sideC=c;
if(a+b>c&&a+c>b&&b+c>a)
{
boo=true;
}
else
{
boo=false;
}
}
}
class Lader
{
double above,bottom,height,area;
Lader(double a,double b,double h)
{
above=a;
bottom=b;
height=h;
}
double getArea( )
{
double area=(above+bottom)*height/2.0;
return area;
}
}
class Circle
{
double radius,area;
Circle(double r)
{
radius=r;
}
double getArea( )
{
double area=3.14*radius*radius;
return area;
}
double getLength( )
{
double length=2*3.14*radius;
return length;
}
void setRadius(double newRadius)
{
radius=newRadius;
}
double getRadius( )
{
return radius;
}
}
public class AreaAndLength
{
public static void main(String args[ ])
{
double length,area;
Circle circle=null;
Trangle trangle;
Lader lader;
circle=new Circle(5);
trangle=new Trangle(3,4,5);
lader=new Lader(3,4,5);
length=circle.getLength();
System.out.println("圆的周长:"+length);
area=circle.getArea();
System.out.println("圆的面积:"+area);
length=trangle.getLength();
System.out.println("三角形的周长:"+length);
area=trangle.getArea();
System.out.println("三角形的面积:"+area);
area=lader.getArea();
System.out.println("梯形的面积:"+area);
trangle.setABC(12,34,1);
area=trangle.getArea();
System.out.println("三角形的面积:"+area);
length=trangle.getLength();
System.out.println("三角形的周长:"+length);
}
}