Abstract Class

Java

by techbard 2016. 6. 24. 13:40

# Shape.java

package shape_demo;

public abstract class Shape
{
public abstract double sumAreas();
}

# Rectangle.java

package shape_demo;

public class Rectangle extends Shape
{
@Override
public double sumAreas()
{
return 1;
}
}

# Triangle.java

package shape_demo;

public class Triangle extends Shape
{
@Override
public double sumAreas()
{
return 0.3;
}
}

# Shapes.java

package shape_demo;

public class Shapes
{
public static double sumAreas(Shape[] shapes)
{
double sum = 0;
for (Shape s : shapes)
{
sum += s.sumAreas();
}

return sum;
}
}

# Shape_Driver.java

package shape_demo;

public class Shape_Driver
{
public static void main(String[] args)
{
Shape[] shapes = {new Rectangle(), new Triangle()};

System.out.println(Shapes.sumAreas(shapes));
}
}