java:单词替换：将一个字符串中的某些单词用特别词汇替换

package com.ethjava;

import java.util.ArrayList;
import java.util.Scanner;

public class wordswap {

    public static void main(String[] args) {
        //自己的答案，用Arraylist将所有的word都存进去，再打印的时候，做一个交换处理
        Scanner sc = new Scanner(System.in);
        ArrayList<String> arrList = new ArrayList<String>();

        while(sc.hasNext()) {
            String str = sc.nextLine();
            String[] word=str.split(" ");
            for(int i=0;i<word.length;i++){
                arrList.add(word[i]);}
            String old=sc.nextLine();
            arrList.add(old);
            String newnew=sc.nextLine();
            arrList.add(newnew);
            for(int i=0; i<arrList.size()-2;i++) {
                if(arrList.get(i).equals(old))
                    System.out.print(newnew+" ");
                else  System.out.print(arrList.get(i)+" ");
            }
        }








        /*范例答案
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            String s = sc.nextLine().trim();
            String old = sc.nextLine().trim();
            String newnew = sc.nextLine().trim();
            String[] words = s.split(" ");
            for (int i = 0; i < words.length; i++) {
                if (words[i].equals(old)) System.out.print(newnew+" ");
                else System.out.println(words[i]+" ");
            }
        }
        sc.close();
        */
    }

}

输入：

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