shapes.java

中文JAVA编程思想第二版,一本很好的JAVA入门书籍!

//: c12:Shapes.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import java.util.*;

class Shape {
  void draw() {
    System.out.println(this + ".draw()");
  }
}

class Circle extends Shape {
  public String toString() { return "Circle"; }
}

class Square extends Shape {
  public String toString() { return "Square"; }
}

class Triangle extends Shape {
  public String toString() { return "Triangle"; }
}

public class Shapes {
  public static void main(String[] args) {
    List s = new ArrayList();
    s.add(new Circle());
    s.add(new Square());
    s.add(new Triangle());
    Iterator e = s.iterator();
    while(e.hasNext())
      ((Shape)e.next()).draw();
  }
} ///:~