findarea.java

来自「JAVA程序设计课程中各章节的程序实例。」· Java 代码 · 共 64 行

//Application of method overide
class figure
{
	double dim1;
	double dim2;
	
	figure(double a, double b)
	{
		dim1 = a;
		dim2 = b;
	}

	double area()
	{
		System.out.println("Area undefined");
		return 0;
	}
}

class rectangle extends figure
{
	rectangle(double a, double b)
	{
		super(a,b);
	}

	double area()
	{
		System.out.println("Inside area rectangle");
		return dim1*dim2;
	}
}

class triangle extends figure
{
	triangle(double a, double b)
	{
		super(a,b);
	}

	double area()
	{
		System.out.println("Inside a triangle");
		return dim1*dim2;
	}
}

class findArea
{
	public static void main(String args[])
	{
		figure f = new figure(1,2);
		figure r = new rectangle(1,2);
		figure t = new triangle(3,4);

		figure figureF;
		figureF = f;
		System.out.println("Area is:" + figureF.area());
		figureF = r;
		System.out.println("Area is:" + figureF.area());
		figureF = t;
		System.out.println("Area is:" + figureF.area());
	}
}