sort string

Hello, I am trying to write a simple sort string without using the array sort method. But it's not working. please help

Code:

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 public static String sort(String s) {
            StringBuffer s1 = new StringBuffer(s);
            s1.sort();
            return s1.toString();
    }

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I don't know what you are trying to achieve. But here is some code that uses a simple buble sort

Code:

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    public static String sort(String string)
    {
        for(int i=0;i<string.length()-1;i++)
            for(int j=i+1;j<string.length();j++)
                if(Character.toLowerCase(string.charAt(j))<Character.toLowerCase(string.charAt(i)))
                    string = swap(string,i,j);
        return string;
    }
   
    private static String swap(String s, int i, int j)
    {
        char[] chars=s.toCharArray();
        char tmp=chars[i];
        chars[i]=chars[j];
        chars[j]=tmp;
        return new String(chars);
    }

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Hello, yeah it works. but could you explain to me about the code below? I could not get it at all, especially with 2 dimensional arrays:

Code:

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private static String swap(String s, int i, int j)
    {
        char[] chars=s.toCharArray();
        char tmp=chars[i];
        chars[i]=chars[j];
        chars[j]=tmp;
        return new String(chars);
    }

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Code:

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private static String swap(String s, int i, int j)
    {
        // Convert String to char array
        char[] chars=s.toCharArray();
        // store char number i in temporary variable
        char tmp=chars[i];
        // replace char[i] with char[j]
        chars[i]=chars[j];
        // replace char [j] with the temp value (old i value)
        chars[j]=tmp;
        // Return a new string from the partially sorted char array
        return new String(chars);
    }

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