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:
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