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how to remove all entries from linkedhashmap?


LinkedHashMap

LinkedHashMap extends HashMap class and implements the Map interface. It contains the elements in key-value pair form. It maintains insertion order for its elements. It not allowed duplicate key. A LinkedHashMap can have only one null key and multiple null values.

We can use clear() method to remove all entries from linkedhashmap.

clear(): Removes all key-value pairs from this map.
Syntax: public void clear()

Example

package com.codesjava;
 
import java.util.LinkedHashMap;
 
public class Test {
	public static void main(String args[]){
		LinkedHashMap<Integer, String> linkedHashMap = 
				new LinkedHashMap<Integer, String>();
 
		//Add objects to the HashSet.
		linkedHashMap.put(4, "Roxy");
		linkedHashMap.put(2, "Sunil");
		linkedHashMap.put(5, "Sandy");
		linkedHashMap.put(1, "Munish");
		linkedHashMap.put(3, "Pardeep");
 
		//Print the LinkedHashMap object.
		System.out.println("LinkedHashMap elements:");
		System.out.println(linkedHashMap);
		linkedHashMap.clear();
		System.out.println("LinkedHashMap after clear operation:" + linkedHashMap);
	}
}

Output

LinkedHashMap elements:
{4=Roxy, 2=Sunil, 5=Sandy, 1=Munish, 3=Pardeep}
LinkedHashMap after clear operation:{}
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