Get a key from a map based on value - Java java.util

Java examples for java.util:Map Value

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Description

Get a key from a map based on value

Demo Code


//package com.java2s;
import java.util.Map;

public class Main {
    /**// w ww .  j  a  va2s  .  c o  m
     * Get a key from a map based on value
     * @param map
     * @param value
     * @param <T>
     * @param <E>
     * @return
     */
    public static <T, E> T getKeyByValue(Map<T, E> map, E value) {
        for (Map.Entry<T, E> entry : map.entrySet()) {
            if (value.equals(entry.getValue())) {
                return entry.getKey();
            }
        }
        return null;
    }
}

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