UTF-8 encode and decode: Difference between revisions

<lang java>import java.util.Formatter;

import java.io.UnsupportedEncodingException;

public static byte[] utf8encode(int codepoint) throws UnsupportedEncodingException {

return new String(new int[]{codepoint}, 0, 1).getBytes("UTF-8");

public static int utf8decode(byte[] bytes) throws UnsupportedEncodingException {

return new String(bytes, "UTF-8").codePointAt(0);

public static final void main(String[] args) throws UnsupportedEncodingException {

System.out.printf("%-7s %-43s %7s\t%s\t%7s\n", "Char", "Name", "Unicode", "UTF-8 encoded", "Decoded");

for (int codepoint : new int[]{0x0041, 0x00F6, 0x0416, 0x20AC, 0x1D11E}) {

byte[] encoded = utf8encode(codepoint);

Formatter formatter = new Formatter();

for (byte b : encoded) {

formatter.format("%02X ", b);

}

String encodedHex = formatter.toString();

int decoded = utf8decode(encoded);

System.out.printf("%-7c %-43s U+%04X\t%-12s\tU+%04X\n", codepoint, Character.getName(codepoint), codepoint, encodedHex, decoded);

}

}

public static final void main(String[] args) throws UnsupportedEncodingException {

System.out.printf("%-7s %-43s %7s\t%s\t%s\n", "Char", "Name", "Unicode", "UTF-8 encoded", "Decoded");

System.out.printf("%-7c %-43s U+%04X\t%-12s\t%c\n", codepoint, Character.getName(codepoint), codepoint, encodedHex, decoded);