Codewars #16 Java format Unicode encoder/decoder (6kyu)

#16 Java format Unicode encoder/decoder 

We need a reusable program to encode/decode text to unicode value as represented in Java and vice-versa.

Encoder:

Input

"hola"

Output

"\u0068\u006f\u006c\u0061"

Decoder:

Input

"\u0068\u006f\u006c\u0061"

Output

"hola"

Observations:

Please note that unicode values have always a back slash \ the letter u and 4 hexadecimal digits corresponding to the value in the unicode character set.

Codewars has some trouble showing non ASCII characters so perhaps you should try it locally first.

import java.io.UnsupportedEncodingException;

public class JavaUnicodeEncoder {
    public static String decode(final String input) throws UnsupportedEncodingException {
    	  String[] arr = input.replace("\\","").split("u");
    	  StringBuilder result = new StringBuilder();
    	  for(String  str :arr){
    		  if(str.length()!=0) {
    			  int hex = Integer.parseInt(str, 16);
    			  result.append((char)hex);
    		  }
    	  }
    	  return result.toString();
    }

    public static String encode(String input){
     	  StringBuilder builder = new StringBuilder();
		  for (char c : input.toCharArray()) {
    		  builder.append("\\u" + Integer.toHexString(c | 0x10000).substring(1));
    	  };
	      return builder.toString();
    }
}