import java.nio.charset.StandardCharsets;
import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        String stringValue = "Ah";
        byte [] mojiCode = stringValue.getBytes(StandardCharsets.UTF_16BE);
        System.out.println(mojiCode);        //[B@372f7a8d
        System.out.println(  Arrays.toString(mojiCode)); //[48, 66]
        for (Byte code : mojiCode) {
            System.out.printf("%02x", code); //3042
        }
        System.out.println("");
        StringByteArray stringByteArray = new StringByteArray(mojiCode);
        System.out.println(stringByteArray.toHexString()); //3042
    }
    static class StringByteArray {
        byte[] byteArray;
        public StringByteArray(byte[] byteArray) {
            this.byteArray = byteArray;
        }
        public String toHexString() {
            StringBuffer stringBuffer = new StringBuffer();
            for (byte code : byteArray) {
                String hexString = String.format("%02x", code);
                stringBuffer.append(hexString);
            }
            return stringBuffer.toString();
        }
    }
}

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