Properties boolean containsKey(Object key) method Example Program
Tests if the specified object is a key in this hashtable.
Program
package com.candidjava;
import java.util.Hashtable;
import java.util.Properties;
/*
* @author : Mohan
* @description : The containsKey() method is used to test if some key maps into the specified value in this hashtable.
*/
public class PropertiesContainKey {
public static void main(String[] args) {
Properties properties = new Properties();
Hashtable ht = new Hashtable(properties);
ht.put("1", "hari");
ht.put("2", "anand");
ht.put("3", "vinoth");
ht.put("4", "mohan");
ht.put("5", "karthick");
System.out.println(ht);
boolean b= ht.containsKey("3");
System.out.println(b);
}
}
Output
{5=karthick, 4=mohan, 3=vinoth, 2=anand, 1=hari}
true
Explanation
public boolean containsKey(Object key)
Tests if the specified object is a key in this hashtable.
Specified by:
containsKey in interface Map<K,V>
Parameters:
key - possible key
Returns:
true if and only if the specified object is a key in this hashtable, as determined by the equals method; false otherwise.
Throws:
NullPointerException - if the key is null
See Also:
contains(Object)
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