import java.lang.*;
import java.util.Iterator;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;


/**
 * Sample for Map.
 */
class MapSample {

  /**
   * Do it.
   */
  public void doIt() {
    Map map = new HashMap();

    // put into Map.
    map.put("red", "blood");
    map.put("blue", "sky");
    map.put("green", "grass");

    // get values.
    String key = null;
    String value = null;
    key = "red";
    value = (String)map.get(key);
    System.out.println("map.get(\"" + key + "\") = " + value);
    key = "blue";
    value = (String)map.get(key);
    System.out.println("map.get(\"" + key + "\") = " + value);
    key = "green";
    value = (String)map.get(key);
    System.out.println("map.get(\"" + key + "\") = " + value);

    // Map to Iterator.
    Set set = map.keySet();
    Iterator iterator = set.iterator();
    while (iterator.hasNext()) {
      String key1 = (String)iterator.next();
      String value1 = (String)map.get(key1);
      System.out.println(key1 + " -> " + value1);
    }
  }

  public static void main(String args[]) {
    MapSample sample = new MapSample();
    sample.doIt();
  }
}