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.HashSet;

import java.util.Optional;
import java.util.function.Predicate;

public class Main {
    /**
     * Returns item in HashSet that matches the specified Predicate.
     * @param set the HashSet to check against
     * @param condition the Predicate to check
     * @param <T> the type of objects in the HashSet
     * @return an Optional containing the matching object, Empty if not found
     * @throws IllegalArgumentException if HashSet or Predicate is null
     */
    public static <T> Optional<T> getItemInHashSet(final HashSet<T> set, final Predicate<T> condition) {
        if (set == null)
            throw new IllegalArgumentException("HashSet cannot be null!");
        if (condition == null)
            throw new IllegalArgumentException("Predicate cannot be null!");
        for (final T object : set)
            if (condition.test(object))
                return Optional.of(object);
        return Optional.empty();
    }
}