Java Hashtable - contains() Method
The java.util.Hashtable.contains() method returns true if this hashtable maps one or more keys to this value.
Syntax
public boolean contains(Object value)
Parameters
value |
Specify the value whose presence in this hashtable is to be tested |
Return Value
Returns true if this hashtable maps one or more keys to the specified value.
Exception
NA.
Example:
In the example below, the java.util.Hashtable.contains() method is used to check whether this hashtable contains any key which is mapped to the specified value or not.
import java.util.*;
public class MyClass {
public static void main(String[] args) {
//creating hashtable
Hashtable<Integer, String> Htable = new Hashtable<Integer, String>();
//populating hashtable
Htable.put(101, "John");
Htable.put(102, "Marry");
Htable.put(103, "Kim");
Htable.put(104, "Jo");
//check for value - "Kim"
System.out.print("Does Htable contain key(s) mapped to 'Kim'? - ");
System.out.print(Htable.contains("Kim"));
//check for value - "Sam"
System.out.print("\nDoes Htable contain key(s) mapped to 'Sam'? - ");
System.out.print(Htable.contains("Sam"));
}
}
The output of the above code will be:
Does Htable contain key(s) mapped to 'Kim'? - true Does Htable contain key(s) mapped to 'Sam'? - false
❮ Java.util - Hashtable
