?? storeshapes.java
字號:
import java.util.Vector;
class Shape
{}
class Circle extends Shape
{
public double radius()
{
return 5.7;
}
//...
}
class Triangle extends Shape
{
public boolean isRightTriangle()
{
//Code to determine if triangle is right
return true;
}
//...
}
class StoreShapes
{
public static void main(String args[])
{
Vector shapeVector = new Vector(10);
shapeVector.add(new Triangle());
shapeVector.add(new Triangle());
shapeVector.add(new Circle());
//...
//Assume many Triangles and Circles are added and removed
//...
int size = shapeVector.size();
for (int i=0; i<size; i++)
{
Object o = shapeVector.get(i);
if (o instanceof Triangle)
{
if (((Triangle)o).isRightTriangle())
{
//...
}
}
else if (o instanceof Circle)
{
double rad = ((Circle)o).radius();
//...
}
}
}
}
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