triangle.java

疯狂Java讲义_源码(含Java设计模式CHM

/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
public class Triangle extends Shape
{
	//定义三角形的三边
	private double a;
	private double b;
	private double c;

	public Triangle(String color , double a , double b , double c)
	{
		super(color);
		this.setSides(a , b , c);
	}

	public void setSides(double a , double b , double c)
	{
		if (a >= b + c || b >= a + c || c >= a + b)
		{
			System.out.println("三角形两边之和必须大于第三边");
			return;
		}
		this.a = a;
		this.b = b;
		this.c = c;
	}
	//重写Shape类的的计算周长的抽象方法
	public double calPerimeter()
	{
		return a + b + c;
	}
	//重写Shape类的的返回形状的抽象方法
	public String getType()
	{
		return getColor() + "三角形";
	}
}