Why can I add characters to strings but not characters to characters?

Question

So I wanted to add a character to a string, and in some cases wanted to double that characters then add it to a string (i.e. add to it itself first). I tried this as shown b

Answer 1

char + char returns an int so the compiler complains that String string = (int), which is indeed wrong.

To concatenate the chars, you can use the empty String ("") at the beginning so the + operator will be for String concatenation or use a StringBuilder that can append chars as well.

char s = 'X';
String string = new StringBuilder().append(s).append(s).toString();

Note: the char variable is s, not X.