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.*;

public class Main {
    public static <E> E first(Collection<E> collection) {

        if (isEmpty(collection)) {
            return null;
        }

        Iterator<E> iterator = collection.iterator();

        if (iterator.hasNext()) {
            return iterator.next();
        }

        throw new IllegalStateException("Should not happen");
    }

    private static <E> boolean isEmpty(Collection<E> collection) {

        return (collection == null || collection.isEmpty());
    }

    private static <E> boolean isEmpty(E[] array) {

        return (array == null || array.length == 0);
    }
}