polygon.java

Java类的继承示例

public class Polygon
{
  public int sides;
  public double area;

  public int getNumberOfSides()
  {
    System.out.println("the number of sides are "+sides);
    return sides;
  }
  public String toString()
  {
    String string="inside the Polygon class";
    return string;
  }
  public Polygon(int x)
  {
    sides=x;
    System.out.println("Inside the Polygon constructor");
  }
}