triangle.java

可以让初学者有一个感性的认识

public class Triangle
{
	double sideA,sideB,sideC;
	double area;
	boolean triangle;

	public void setSideA(double a){sideA=a;}

	public double getSideA(){return sideA;}

	public void setSideB(double b){sideB=b;}

	public double getSideB(){return sideB;}

	public void setSideC(double c){sideC=c;}

	public double getSideC(){return sideC;}

	public double getArea()
	{
		double p=(sideA+sideB+sideC)/2.0;
		area=Math.sqrt(p*(p-sideA)*(p-sideB)*(p-sideC));
		return area;
	}

	public boolean isTriangle()
	{
		if(sideA<sideB+sideC&&sideB<sideA+sideC&&sideC<sideA+sideB)
			triangle=true;
		else
			triangle=false;
		return triangle;
	}
}