字符串各种操作

[java]代码库

import java.util.*; 
public class Main{ 
    public static void main(String[] args) { 
         Scanner scan = new Scanner(System.in);
         String s = scan.nextLine();
         String cs = scan.next();
         char c = cs.charAt(0);
         String str = scan.next();
         
         int i, count = 0;
         for(i = 0; i < s.length(); i++) {
        	 if(s.charAt(i) == c){                  
        		 count++;
        	 }       		 
         }
         System.out.println(count);
         for(i = s.length()-1; i >= 0; i--) {
        	 System.out.print(s.charAt(i));
         }
         System.out.println();
         
         i = 0;
         int index = s.indexOf(str);
         while(index != -1) {
        	 if(i == 0)
        		 System.out.print(index);
        	 else
        		 System.out.print(" "+index);
        	 i = index + str.length();
        	 index = s.indexOf(str, i);
         }
         System.out.println();
        
        StringBuffer sb = new StringBuffer(s) ;
 		int fromIndex = 0; //第一个单词首字母位置
 		do {
 			sb.replace(fromIndex, fromIndex+1, sb.substring(fromIndex, fromIndex+1).toUpperCase());
 		} while ( (fromIndex = sb.indexOf(" ", fromIndex)+1) != 0);
 		System.out.println(sb);
 		
         scan.close();  
    } 
}