Posted on 2007-04-07 22:12
停留的风 阅读(619)
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Java程序集合
abstract class GeometricObject {
private String color = "white";
private boolean filled;
protected GeometricObject()
{}
/** 颜色和填充 */
protected GeometricObject(String color, boolean filled)
{
this.color = color;
this.filled = filled;
}
/**颜色get方法 */
public String getColor()
{
return color;
}
/** 颜色的set方法*/
public void setColor(String color)
{
this.color = color;
}
/** 填充的定义 */
public boolean isFilled()
{
return filled;
}
/** 建立fill的set方法 */
public void setFilled(boolean filled)
{
this.filled = filled;
}
public abstract double getArea();
public abstract double getPerimeter();
}
public class Triangle extends GeometricObject
{
private double side1=1.0;
private double side2=1.0;
private double side3=1.0;
//无参构造器
public Triangle()
{
this(1.0,1.0,1.0,"red",false);
}
public Triangle(double side1,double side2,double side3)
{
this(side1,side2,side3,"red",false);
}
//有参构造器
public Triangle(double side1, double side2,double side3,String color,boolean filled)
{
super(color,filled);
this.side1=side1;
this.side2=side2;
this.side3=side3;
}
//定义Side1的Get和Set方法
public double getSide1()
{
return side1;
}
public void setSide1(double side1)
{
this.side1=side1;
}
//定义Side2的Get和Set方法
public double getSide2()
{
return side2;
}
public void setSide2(double side2)
{
this.side2=side2;
}
//定义Side3的Get和Set方法
public double getSide3()
{
return side3;
}
public void setSide3(double side3)
{
this.side3=side3;
}
//求面积
public double getArea()
{
double p;
p=(side1+side2+side3)/2;
double s;
s=Math.sqrt(p*(p-side1)*(p-side2)*(p-side3));
return s;
}
//计算周长
public double getPerimeter()
{
return (side1+side2+side3);
}
//定义toString文本说明
public String toString()
{
return "Triangle: side1 = " + side1 + " side2 = " + side2 +" side3 = " + side3;
}
public static void main(String[] args)
{
Triangle tr = new Triangle(3.6,5.8,3.5);
System.out.println("The perimeter of Triangle is :"+tr.getPerimeter());
System.out.println("The area of Triangle is :"+tr.getArea());
System.out.println("The color of Triangle is :"+tr.getColor());
System.out.println("The filled of Triangle is :"+tr.isFilled());
}
}