OnJava8-Examples/polymorphism/shape/RandomShapeGenerator.java

// polymorphism/shape/RandomShapeGenerator.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
// A "factory" that randomly creates shapes.
package polymorphism.shape;
import java.util.*;

public class RandomShapeGenerator {
  private Random rand = new Random(47);
  public Shape get() {
    switch(rand.nextInt(3)) {
      default:
      case 0: return new Circle();
      case 1: return new Square();
      case 2: return new Triangle();
    }
  }
}