Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.HashSet;

import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;

public class Main {
    /**
     * Many to One way of finding Keys from value
     * @param map
     * @param value
     * @return keys
     */
    public static <T, E> Set<T> getKeysByValue(Map<T, E> map, E value) {
        Set<T> keys = new HashSet<T>();
        for (Entry<T, E> entry : map.entrySet()) {
            if (value.equals(entry.getValue())) {
                keys.add(entry.getKey());
            }
        }
        return keys;
    }
}