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Tip of the Day
Language: Java
Expertise: Intermediate
Mar 19, 2001

Returning Keywords From a Map


A Hashmap is often used to store Keyword-Value pairs. The keywords are strings, so it is convenient to return a list of the keywords as an array of Strings. Fortunately, there is an easy way to do this! In the following code, the getKeywords() method extracts the keywords as a Set, and then converts them to an array of Strings.
 
// The following code will print:
//  key2
//  key1
import java.util.HashMap;
import java.lang.*;
 
public class KeyVal {
  protected HashMap keyValMap;
 
  public KeyVal() {
    keyValMap = new HashMap();
    keyValMap.put(
Robert Patterson
 
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