Question

How to swap pairs of characters in a string with Java

Answer 1

public class MyClass {
    public static String SwapPairs(String str) {
        if (str == null || str.isEmpty())
            return str;
  
        char[] arr = str.toCharArray();
  
        for (int i = 0; i < arr.length - 1; i += 2) {
            char tmp = arr[i];
            arr[i] = arr[i + 1];
            arr[i + 1] = tmp;
        }
  
        return new String(arr);
    }
    public static void main(String args[]) {
        String str = "aBcDeFgHiJkL";
  
        System.out.println(SwapPairs(str));
    }
}




/*
run:

BaDcFeHgJiLk

*/

 

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