题目1111：单词替换

 1 import java.math.BigInteger;
 2 import java.util.Arrays;
 3 import java.util.Scanner;
 4  
 5 public class Main{
 6     public static void main(String[]args){
 7     Scanner in=new Scanner(System.in);
 8     while(in.hasNext()){
 9         String s=in.nextLine();
10         String a=in.nextLine();
11         String b=in.nextLine();
12         String[]t=s.split(" ");
13         int len=t.length;
14         s="";
15         for(int i=0;i<len;i++){
16         if(t[i].equals(a)){
17             t[i]=b;
18         }
19         s+=t[i];
20         if(i!=len-1)
21             s+=" ";
22         }
23         System.out.println(s);
24     }
25     }
26  }
27  
28 /**************************************************************
29     Problem: 1111
30     User: 0000H
31     Language: Java
32     Result: Accepted
33     Time:80 ms
34     Memory:15456 kb
35 ****************************************************************/