Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.util.ArrayList;

import java.util.Collection;

import java.util.Iterator;
import java.util.List;

public class Main {
    public static <O> List<O> head(Collection<O> c, int num) {
        return extract(c != null ? c.iterator() : null, num);
    }

    @SuppressWarnings("unchecked")
    protected static <O> List<O> extract(Iterator<?> iter, int num) {
        if (iter == null) {
            return null;
        }

        List<O> list = new ArrayList<O>();

        while (iter.hasNext() && (num == -1 || list.size() < num)) {
            O item = (O) iter.next();
            list.add(item);
        }

        return list;
    }
}