Here you can find the source of randomSubset(String[] list, int count)
| Parameter | Description |
|---|---|
| count | the number of Strings you want returned in the subset |
public static String[] randomSubset(String[] list, int count)
//package com.java2s; /*//www . ja v a2 s . c o m * Copyright: (c) 2002-2006 Mayo Foundation for Medical Education and * Research (MFMER). All rights reserved. MAYO, MAYO CLINIC, and the * triple-shield Mayo logo are trademarks and service marks of MFMER. * * Except as contained in the copyright notice above, the trade names, * trademarks, service marks, or product names of the copyright holder shall * not be used in advertising, promotion or otherwise in connection with * this Software without prior written authorization of the copyright holder. * * Licensed under the Eclipse Public License, Version 1.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.eclipse.org/legal/epl-v10.html * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.*; public class Main { /**Returns a subset of the list supplied. The items in the returned are non-repeated. @param count the number of Strings you want returned in the subset */ public static String[] randomSubset(String[] list, int count) { if (list.length < count) return null; Vector vList = new Vector(); for (int i = 0; i < list.length; i++) { vList.addElement(list[i]); } Random random = new Random(System.currentTimeMillis()); String RandomItems[] = new String[count]; int index; for (int i = 0; i < count; i++) { index = random.nextInt(vList.size()); RandomItems[i] = (String) (vList.elementAt(index)); vList.removeElementAt(index); } return RandomItems; } }