shapes.java

来自「think in java TIJ-3rd-edition-code.zip」· Java 代码 · 共 41 行

//: c12:Shapes.java
package c12;
import com.bruceeckel.simpletest.*;
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) {
    SimpleTest monitor =
      new SimpleTest("c12.Shapes");
    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();
    monitor.expect(new String[] {
      "Circle.draw()",
      "Square.draw()",
      "Triangle.draw()"
    });
  }
} ///:~