Java tutorial
import java.util.LinkedHashMap; public class Main { public static void main(String[] args) { LinkedHashMap<String, String> lHashMap = new LinkedHashMap<String, String>(); lHashMap.put("1", "One"); lHashMap.put("2", "Two"); lHashMap.put("3", "Three"); boolean blnExists = lHashMap.containsKey("3"); System.out.println(blnExists); } }