Remove all mappings from TreeMap example

In this example we shall show you how to remove all mappings from a TreeMap, that is removing all key value pairs from the TreeMap. To clear a TreeMap one should perform the following steps:

  • Create a new TreeMap.
  • Populate the map with elements, with put(K key, V value) API method of TreeMap.
  • Invoke clear() API method of TreeMap. The method removes all of the mappings from this map, so that the map will be empty after this call returns,

as described in the code snippet below.

package com.javacodegeeks.snippets.core;

import java.util.TreeMap;
public class ClearTreeMap {
  public static void main(String[] args) {
    // Create a TreeMap and populate it with elements
    TreeMap treeMap = new TreeMap();
    System.out.println("TreeMap contains : " + treeMap);

    // void clear method() removes all mappings of TreeMap class

    System.out.println("TreeMap contains : " + treeMap);



TreeMap contains : {key_1=element_1, key_2=element_2, key_3=element_3}
TreeMap contains : {}

This was an example of how to remove all mappings from a TreeMap in Java.

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Ilias Tsagklis

Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.
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