Java tutorial
//package com.java2s; /* Copyright (C) 2002 Univ. of Massachusetts Amherst, Computer Science Dept. This file is part of "MALLET" (MAchine Learning for LanguagE Toolkit). http://www.cs.umass.edu/~mccallum/mallet This software is provided under the terms of the Common Public License, version 1.0, as published by http://www.opensource.org. For further information, see the file `LICENSE' included with this distribution. */ import java.util.ArrayList; public class Main { static public double[] toDoubleArray(ArrayList list) { double[] result = new double[list.size()]; for (int i = 0; i < list.size(); i++) { Number n = (Number) list.get(i); result[i] = n.doubleValue(); } return result; } }