Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.util.Collection;
import java.util.List;

public class Main {
    /**
     * Return the first item from a collection using the most efficient
     * method possible. Returns null for an empty collection.
     *
     * @param c The Collection.
     * @return the first element of a Collection.
     */
    public static Object getFirstItemOrNull(Collection c) {
        if (c.size() == 0) {
            return null;
        }
        return getFirstItem(c);
    }

    /**
     * Return the first item from a collection using the most efficient
     * method possible.
     *
     * @param c The Collection.
     * @return the first element of a Collection.
     * @throws java.util.NoSuchElementException if the collection is empty.
     */
    public static Object getFirstItem(Collection c) {
        if (c instanceof List) {
            return ((List) c).get(0);
        }
        return c.iterator().next();
    }
}