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);

      }

   }

}