testarea.java

半年的java基础联系源码！现在看了破！对于初学java的朋友能帮上忙就用吧

class ShareArea {
	String name;
	double area;
	double girth;
	public void show()
	{
		System.out.println(name);
		System.out.println(area);
		System.out.println(girth);
	}
}
class Rectangle extends ShareArea{
	double weith;
	double heith;
	Rectangle(double weith,double heith){
		this.weith=weith;
		this.heith=heith;
	}
	public double area()
	{
	     double area;
	     area=weith*heith;
	     return area;
	}
	public double girth()
	{
		 double girth;
		 girth=2*(weith+heith);
		 return girth;
	}
}
class Cycle extends ShareArea{
	final double PI=3.14;
	double radii;
	Cycle(double radii)
	{
		this.radii=radii;
	}
	public double area(){
		double area;
	    area=PI*radii*radii;
	    return area;
	}
	public double girth(){
		double girth;
	    girth=2*PI*radii;
	    return girth;
	}
}
class Trigon extends ShareArea{
	double x,y,z;
	double angle;
	
}
class Square extends ShareArea{
	double sidecar;
	Square(double sidecar)
	{
		this.sidecar=sidecar;
	}
	public double area()
	{
		double area;
		area=sidecar*sidecar;
		return area;
	}
	public double girth()
	{
		double girth;
		girth=4*sidecar;
		return girth;
	}
}	
public class TestArea
{
	public static void main(String[] args)
	{
		double area;
                double length;
		Square tt= new Square(4.0);
	    area=tt.area();
            length=tt.girth();
	    System.out.println(area);
            System.out.println(length);
	}
	
}