Java Collection Tutorial - Java Hashtable.containsKey(Object key)


Hashtable.containsKey(Object key) has the following syntax.

public boolean containsKey(Object key)


In the following code shows how to use Hashtable.containsKey(Object key) method.

//from ww w .  jav a2  s  . com
import java.util.Hashtable;

public class Main {
   public static void main(String args[]) {
      Hashtable<Integer, String> htable = new Hashtable<Integer, String>();

      // put values into the table
      htable.put(1, "A");
      htable.put(2, "B");
      htable.put(3, "C");
      htable.put(4, "from");

      // check if table contains key "3"
      boolean isavailable=htable.containsKey(3);

      // display search result
      System.out.println("Hash table contains key '3': "+isavailable);      

The code above generates the following result.