11章-练习26

import java.util.*;

/**
 * 练习26：拿到练习25中所产生的Map，并按照它们在最初的文件中出现的顺序重新创建单词顺序。
 */
public class Exercise26 {

    public static void main(String[] args) {
        Map<String, ArrayList<Integer>> map = new HashMap<String, ArrayList<Integer>>();
        List<String> words = new ArrayList<String>();
        words.addAll(new TextFile("UniqueWords.java", "\\W+"));
        System.out.println(words);
        ArrayList<Integer> arrayList = new ArrayList<Integer>();
        for (int i = 0; i < words.size(); i++) {
            String word = words.get(i);
            if (map.get(word) == null) {
                arrayList = new ArrayList<Integer>();
                arrayList.add(i);
            } else {
                arrayList = map.get(word);
                arrayList.add(i);
            }
            map.put(word, arrayList);
        }
        System.out.println(map);
        Map<Integer, String> linkedHashMap = new LinkedHashMap<>();
        Set<String> keySet = map.keySet();
        Iterator<String> it = keySet.iterator();
        while (it.hasNext()) {
            String key = it.next();
            ArrayList<Integer> keyIndexList = map.get(key);
            for (Integer index : keyIndexList) {
                linkedHashMap.put(index, key);
            }
        }
        List<Integer> newKeyList = new ArrayList<>(linkedHashMap.keySet());
        Collections.sort(newKeyList);
        for (int newKey : newKeyList) {
            System.out.print(linkedHashMap.get(newKey) + " ");
        }
    }
}
/* OutPut:
[package, com, example, demo, elevensection, import, java, util, Set, import, java, util, TreeSet, public, class, UniqueWords, public, static, void, main, String, args, Set, String, words, new, TreeSet, String, String, CASE_INSENSITIVE_ORDER, words, addAll, new, TextFile, Users, liran, Project, demo, src, main, java, com, example, demo, elevensection, SetOperations, java, W, System, out, println, words]
{com=[1, 41], CASE_INSENSITIVE_ORDER=[29], Set=[8, 22], import=[5, 9], main=[19, 39], SetOperations=[45], String=[20, 23, 27, 28], Users=[34], demo=[3, 37, 43], System=[48], example=[2, 42], out=[49], println=[50], java=[6, 10, 40, 46], public=[13, 16], TreeSet=[12, 26], W=[47], class=[14], new=[25, 32], liran=[35], package=[0], static=[17], void=[18], src=[38], words=[24, 30, 51], TextFile=[33], elevensection=[4, 44], args=[21], Project=[36], util=[7, 11], addAll=[31], UniqueWords=[15]}
package com example demo elevensection import java util Set import java util TreeSet public class UniqueWords public static void main String args Set String words new TreeSet String String CASE_INSENSITIVE_ORDER words addAll new TextFile Users liran Project demo src main java com example demo elevensection SetOperations java W System out println words

 *///:~