Java Hashmap remove() Method
Methods in Java
A method is a group of code or set of code which is used perform a certain task. We do not need to write code again and again , instead of writing the code we can use these methods. There are two types of methods in java ‘user defined’ and ‘Inbuilt’ methods. The Hashmap class in java also have some inbuilt methods, one of those method is Java Hashmap remove() Method.
To know more about Hashmap remove() Method read the complete article
Java Hashmap remove() Method
The hashmap remove() method is used to remove the specified key and its mapping value from the hashmap. Below in this page you can find it’s syntax, return values, parameters with detailed examples.
Syntax :
hashmap.remove(Object key);
Return values :
Value which is mapped to the specified key.
null : If the key is not present in the hashmap.
Hashmap remove() Method Examples
Example 1 :
import java.util.*;
public class Main
{
public static void main (String[]args)
{
// Creating an empty HashMap
HashMap < Integer, String > hash_map_1 =
new HashMap < Integer, String > ();
// Mapping string values to int keys in a empty hashmap
hash_map_1.put (10, "Java");
hash_map_1.put (20, "Hashmap");
hash_map_1.put (25, "Remove");
hash_map_1.put (30, "method");
//removing the key using remove() method
String removed=hash_map_1.remove(20);
System.out.println ("Value of removed key is : " + removed);
}
}
Output :
Value of removed key is : Hashmap
Example 2 :
import java.util.*;
public class Main
{
public static void main (String[]args)
{
// Creating an empty HashMap
HashMap < Integer, String > hash_map_1 =
new HashMap < Integer, String > ();
// Mapping string values to int keys in a empty hashmap
hash_map_1.put (10, "Java");
hash_map_1.put (20, "Hashmap");
hash_map_1.put (25, "Remove");
hash_map_1.put (30, "method");
//removing the key using remove() method
String removed=hash_map_1.remove(35);
System.out.println ("Value of removed key is : " + removed);
}
}
Output :
Value of removed key is : null
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