Question

How to reverse the middle N characters of a string in Java

Answer 1

public class MyClass {
   static  String reverse_middle(String s, int pos) { 
        int len = s.length();
        int mid = (len - pos) / 2; 
        String  tmp = "";
     
        for (int i = 0; i < mid; i++) 
            tmp += s.charAt(i); 
       
        for (int i = mid + pos - 1; i >= mid; i--) 
            tmp += s.charAt(i); 
       
        for (int i = mid + pos; i < len; i++) 
             tmp += s.charAt(i);
         
        return tmp;
    } 
    public static void main(String args[]) {
        String s = "abcdefg"; 
        int pos = 3; 

        System.out.println(reverse_middle(s, pos)); 
    }
}



/*
run:

abedcfg

*/

 

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