With this example we are going to demonstrate how to remove mapping from a LinkedHashMap, that is removing a key value pair from a LinkedHashMap. In short, to remove mapping from a LinkedHashMap you should:
- Create a new LinkedHashMap.
- Populate the linkedHashMap with elements, with
put(K key, V value)API method of LinkedHashMap. - Invoke
remove(Object key)API method of LinkedHashMap. It removes the mapping for the specified key from this map if present, and returns the previous value associated with this key, or null if there was no mapping for the key.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
import java.util.LinkedHashMap;
public class RemoveMappingLinkedHashMap {
public static void main(String[] args) {
// Create a LinkedHashMap and populate it with elements
LinkedHashMap linkedHashMap = new LinkedHashMap();
linkedHashMap.put("key_1","value_1");
linkedHashMap.put("key_2","value_2");
linkedHashMap.put("key_3","value_3");
System.out.println("LinkedhashMap contains : " + linkedHashMap);
/*
Object remove(Object key) operantion removes a key value pair from LinkedHashMap.
It returns either the value mapped with the key previously or null if no value was mapped.
*/
Object value = linkedHashMap.remove("key_2");
System.out.println("After removing value : " + value + " LinkedhashMap contains : " + linkedHashMap);
}
}
Output:
LinkedhashMap contains : {key_1=value_1, key_2=value_2, key_3=value_3}
After removing value : value_2, LinkedhashMap contains : {key_1=value_1, key_3=value_3}
This was an example of how to remove mapping from a LinkedHashMap in Java.
