Why does this not compile

[pastel pasture]

public class Interaction {
  public static void main(String[] args){
    char myUnicodeChar = 'U+003F' , mySimpleChar = '?' , myDecimalChar = '63';
    System.out.println(myDecimalChar + mySimpleChar + myUnicodeChar);



  }
}

[azure rampart]

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[hushed igloo]

'x' is the literal notation for a character. the contents can only be a single character or an escape sequence.

for the third one, just remove the quotes, you want the plain number there.
for the first one, you could either use a hexadecimal number, or you could use the proper escape, '\u003F'. U+XXXX isn't valid syntax in code.

[pastel pasture]

thank you bro

[azure rampart]

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[pastel pasture]

understood