How Can I Convert an Integer to a Character in Java?

Exploring Integer-to-Character Conversion in Java

In Java, converting an integer to a character can be achieved through casting. However, there is a subtle difference between using the integer literal and the character literal in such conversions.

When using an integer literal, such as int a = 1;, the value is treated as a decimal integer. Casting it to a character using (char) a would result in the character with the Unicode code point corresponding to the decimal value. In this case, the Unicode code point for 1 is the start-of-heading character, which is not printable.

In contrast, when using a character literal, such as int a = '1';, the value is treated as a Unicode character. Casting it to a character using (char) a would directly return the same character.

To convert an integer to a character where the integer represents a digit (0-9), one can add 48 to the integer before casting. This is because the Unicode code points for digits start at 48. For example, int a = 1; char b = (char) (a 48); would result in the character '1'.

Alternatively, one can use the Character.forDigit() method, which takes an integer representing a digit and a base (10 for decimal digits). For instance, char b = Character.forDigit(1, 10); would also yield the character '1'.

Finally, to convert an integer representing a Unicode code point to a character, one can use the Character.toChars() method. For example, char[] chars = Character.toChars(48); would return an array containing the character with Unicode code point 48.

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