Object put(Object key, Object value) Associates key and value. : Map « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. Map

import java.util.HashMap;
import java.util.Map;

public class MainClass {
  public static void main(String[] argv) {
    Map map = new HashMap();
    map.put("key", "value");
    // the older value is removed and returned
    map.put("key", "value new");
    System.out.println(map);
  }
}

{key=value new}