Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import java.util.Map;

public class Main {
    /**
     * Rename key1 by key2 in map, for example, if We have the follow code:<br>
     *     <pre>
     *         Map<Strin, String> map = new HashMap<>();
     *         map.put("key1", "value1");
     *         CollectionsUtils.renameKey( map, "key1", "key2");
     *         System.out.println( map.get("key1") + " " + map.get("key2"));
     *     </pre>
     *
     * The output will be <pre>value1 null</pre>
     * 
     * @param map map where the key have to be replace
     * @param key1 key to replace
     * @param key2 new key
     * @param <K>
     * @param <V>
     */
    public static <K, V> void renameKey(Map<K, V> map, K key1, K key2) {
        V emailaddress = map.get(key1);
        map.remove(key1);
        map.put(key2, emailaddress);
    }
}