string to unicode

public class TestTest {
    public static String convert(String str) {
        StringBuffer ostr = new StringBuffer();

        for (int i = 0; i < str.length(); i++) {
            char ch = str.charAt(i);

            if ((ch >= 0x0020) && (ch <= 0x007e)) { // Does the char need to be converted to unicode?
                ostr.append(ch); // No.
            } else { // Yes.
                
                ostr.append("\\u"); // standard unicode format.
                String hex = Integer.toHexString(str.charAt(i) & 0xFFFF); // Get hex value of the char.
                
                for (int j = 0; j < 4 - hex.length(); j++)
                    // Prepend zeros because unicode requires 4 digits
                    ostr.append("0");
                ostr.append(hex.toLowerCase()); // standard unicode format.
                // ostr.append(hex.toLowerCase(Locale.ENGLISH));
            }
        }

        return (new String(ostr)); // Return the stringbuffer cast as a string.
    }
    public static void main(String[] args) {
        System.out.println(TestTest.convert("récupération de mot de passe"));
    }
} 

got this from here