Java示例搜索重复的单词

import java.util.Scanner;
import java.io.*;
import java.util.regex.*;
import java.util.ArrayList;

public class dupl {
   public static void main(String[] args) {
      ArrayList <String> manyLines = new ArrayList<String>();
      ArrayList <String> noRepeat = new ArrayList<String>();
      try {
         String s1 = "Hello hello Hello there there past pastures ";
         Scanner myfis = new Scanner(s1);
         while(myfis.hasNext()) {
            String line = myfis.nextLine();
            String delim = System.getProperty("line.separator");
            String [] lines = line.split(delim);

            for(String s: lines) {
               if(!s.isEmpty()&&s!=null) {
                  manyLines.add(s);
               }
            }
         }

         if(!manyLines.isEmpty()) {
            System.out.print("Original text is:\n");
            for(String s: manyLines) {
               System.out.println(s);
            }
         }

         if(!manyLines.isEmpty()) {
            for(String s: manyLines) {
               String result = s.replaceAll("(?i)\\b([a-z]+)\\b(?:\\s+\\1\\b)+", "$1");
               noRepeat.add(result);
            }
         }

         if(!noRepeat.isEmpty()) {
            System.out.print("After Remove duplicates:\n");
            for(String s: noRepeat) {
               System.out.println(s);
            }
         }
      } catch(Exception ex) {
         System.out.println(ex);
      }
   }
}