The java.net.URLEncoder.code(String) was deprecated. What should I write instead of this?

You can use a method called code in the URL Encoder class. URLEncoder.encode(String, String) The first parameter is the text to encode, and the second parameter is the encoding type such as UTF-TF-8.

System.out.println(
  URLEncoder.encode(
    "urlParameterString",
    java.nio.charset.StandardCharsets.UTF_8.toString()
  )
);