Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Creative Commons License 

import java.util.HashMap;

import java.util.Map;

import java.util.function.Predicate;

public class Main {
    /**
     * Checks if a value userExists in a HashMap that matches the specified Predicate.
     * @param map the HashMap to check against
     * @param condition the Predicate to check
     * @param <K> the type of the Key in the HashMap
     * @param <V> the type of the Value in the HashMap
     * @return true if condition is true
     * @throws IllegalArgumentException if HashMap or Predicate is null
     */
    public static <K, V> boolean doesItemExistInHashMap(final HashMap<K, V> map, final Predicate<V> condition) {
        if (map == null)
            throw new IllegalArgumentException("HashMap cannot be null!");
        if (condition == null)
            throw new IllegalArgumentException("Predicate cannot be null!");
        for (final Map.Entry<K, V> entry : map.entrySet())
            if (condition.test(entry.getValue()))
                return true;
        return false;
    }
}