java實現找出兩個檔案中相同的單詞，具體程式碼如下所示：

package com.zy.DesignPrinciples.singleresponsibility;

import javax.print.DocFlavor;
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.HashSet;

/**
 * @ClassName: ReaderComplete
 * @Author: Tiger
 * @Title: 找出兩個檔案中相同的單詞
 * @Datetime: 2020/8/19  19:49
 * @Package: com.zy.DesignPrinciples.singleresponsibility
 */
public class ReaderComplete {
  public static void main(String[] args) throws Exception {
    String s = loadFile("F:\\.temp\\1.txt");
    String s1 = loadFile("F:\\.temp\\2.txt");
    String[] words1 = parseWordsFromString(s);
    String[] words2 = parseWordsFromString(s1);
    String[] words = findTheSameWords(words1,words2);
    for (String word : words) {
      System.out.println(word);
    }
  }

  //載入檔案內容，並將文字內容解析返回出去
  public static String loadFile(String path) throws Exception {
    FileReader reader = new FileReader(path);
    //bufferedReader 一次只能讀一行內容
    BufferedReader br = new BufferedReader(reader);
    String line = null;
    StringBuilder sb = new StringBuilder();
    while ((line = br.readLine()) != null) {

      sb.append(line);
      sb.append("\n");
    }
    br.close();
    return sb.toString();
  }
  //將解析的內容變成陣列
  public static String[] parseWordsFromString(String string) {
    String[] strings = string.split("[^a-zA-Z]+");
    return strings;

  }
  //查詢兩檔案的相同程式碼
  public static String[] findTheSameWords(String[] s1,String[] s2){
    HashSet<String> set = new HashSet<>();
    for (int i = 0; i < s1.length; i++) {
      for (int j = 0; j < s2.length; j++) {
        if (s1[i].equals(s2[j])){
          set.add(s1[i]);
        }
      }
    }
    return set.toArray(new String[] {});
  }
}

第二種比較單詞的方法：將string【】陣列轉換成集合，通過集合的retainAll()方法
兩個集合取交集

public static String[] findTheSameWords2(String[] s1,String[] s2){

    //將字串陣列轉換成集合
    List<String> list = new ArrayList(Arrays.asList(s1));
    List<String> list2 = new ArrayList(Arrays.asList(s2));
    //計算交集 並且把計算結果存入到list中而且list2並不會改變
    list.retainAll(list2);
    HashSet<String> set = new HashSet<>(list);
    return set.toArray(new String[] {});
  }

總結

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