java替换字符串和用indexof查找字符

java自带替换

String s="hlz_and_hourui哈哈";
String new_S=s.replaceAll("哈", "笑毛");
System.out.println(new_S);

则输出为:"hlz_and_hourui笑毛笑毛";

 

 1 package find_repalce_keywords;

 2 

 3 import java.io.BufferedReader;

 4 import java.io.IOException;

 5 import java.io.InputStreamReader;

 6 

 7 public class find_repalce_keywords {

 8 

 9     public static void main(String[] args) {

10         

11         String s="hlz_and_hourui哈哈";

12         //java自带替换

13         String new_S=s.replaceAll("哈", "笑毛");

14         System.out.println(new_S);

15         String input = null;

16         String finding=null;

17         System.out.println("enter a string:");

18         System.out.flush();

19         

20         try {

21             input=getString();

22         } catch (IOException e) {

23             e.printStackTrace();

24         }

25         System.out.println("输入你想查找的词");

26         try {

27             finding=getString();

28         } catch (IOException e) {

29             e.printStackTrace();

30         }

31         FindAndRepace far=new FindAndRepace();

32             far.repalce(input, finding);

33             

34 

35     }

36 

37     //I/O操作

38     public static String getString() throws IOException {

39         InputStreamReader isr=new InputStreamReader(System.in);

40         BufferedReader br=new BufferedReader(isr);

41         String s=br.readLine();

42         return s;

43     }

44 }

45 

46 class FindAndRepace

47 {

48     int i=0;

49     public int repalce(String str,String finding)

50     {

51         if(str.indexOf(finding, i)!=-1)

52         {

53             

54             System.out.print("要找的"+finding+"在"+(str.indexOf(finding, i)+1)+"||||");

55             i=str.indexOf(finding, i)+1;

56             repalce(str, finding);//递归

57         }

58         else

59         {

60             System.out.println("搜索结束");

61         }

62         return i;

63     }

64 

65 

66 }

运行效果：