Rosetta Challenge! -- Reverse a String

Processing Coding Questions
23

In order to better understand what is happening, I started to solve the UTF-8 encode and decode related to this task.
The task is :

good
good765×185 58.2 KB

My working stage is:
wrong
wrong792×270 56.7 KB

Where I ran again in problems because the last one is also a combined character.
I can´t believe this isn’t possible in java. It must be possible at byte level.

import java.nio.charset.StandardCharsets;
import java.util.Formatter;
int t = 50; 
int tel;

Character[] chars = {'A', 'ö', 'Ж', '€', '?'}; // I changed last character because "\u1D11E" the Musical Symbol G Clef
                                               // can't be displayed in the editor it gives the errot "Invalid character constant "

void setup() {
  size(740, 200);
  background(255);
  fill(0);
  textSize(15);
  text("Character      Name                                                            Unicode         UTF-8 encoding (hex)", 25, 30);
  text("-------------------------------------------------------------------------------", 25, 50);
  for (int codepoint : new int[]{0x0041, 0x00F6, 0x0416, 0x20AC, 0x1D11}) {
    byte[] encoded = utf8encode(codepoint);
    Formatter formatter = new Formatter();
    for (byte b : encoded) {
      formatter.format("%02X ", b);
    }
    String encodedHex = formatter.toString();
    int decoded = utf8decode(encoded);
    println(decoded);
    t += 25;    
    text(chars[tel], 30, t); 
    text(Character.getName(codepoint), 130, t);
    text("U+"+hex(chars[tel]), 450, t);
    text(encodedHex, 550, t);
    tel++;
  }
}

final byte[] utf8encode(int codepoint) {
  return new String(new int[]{codepoint}, 0, 1).getBytes(StandardCharsets.UTF_8);
}

int utf8decode(byte[] bytes) {
  return new String(bytes, StandardCharsets.UTF_8).codePointAt(0);
}
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