package examples;

public class CallbackExample
{
  public static void main(String[] args)
  {
    int[] values = { 4, -5, 8, 37, 56, 2, 15, 92 };
    System.out.print("Values > 10 : ");
    forEach(values, new GreaterThan10() );
    System.out.println();

    System.out.print("Values < 20 : ");
    forEach(values, new LessThan20() );
    System.out.println();
  }

  static void forEach(int[] vals, Callee callMe)
  {
    for (int i = 0; i < vals.length; i++)
    {
      callMe.select(vals[i]);
    }
  }
}

interface Callee
{
  void select(int value);
}

class GreaterThan10 implements Callee
{
  public void select(int value)
  {
    if (value > 10)
      System.out.print(" " + value);
  }
}

class LessThan20 implements Callee
{
  public void select(int value)
  {
    if (value < 20)
      System.out.print(" " + value);
  }
}