How Does Int-to-Char Conversion Work in Java?

Understanding Int-to-Char Conversion in Java

In Java, converting an integer to a character involves casting, but the process can be nuanced.

int a = 1;
char b = (char) a;
System.out.println(b);

This code snippet produces an empty output because it converts the integer 1 to its corresponding Unicode code point, which is the start-of-heading character (not printable).

To convert a single digit to a character, add 48 before casting:

int a = 1;
char b = (char) (a + 48);
System.out.println(b); // Outputs '1'

This works because '1' in ASCII code is 49, which is 1 48.

However, if you mistakenly use int a = '1';, you will be creating a char literal, not an integer variable:

int a = '1';
char b = (char) a;
System.out.println(b); // Outputs '1'

In this case, the code will work correctly because you are directly converting a char literal to a char.

To convert an int representing a Unicode code point to a char, use Character.toChars():

int codePoint = 48;
char[] chars = Character.toChars(codePoint);
System.out.println(chars[0]); // Outputs the character with Unicode code point 48

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