Java char Data Type: Size, Range, Unicode, Examples & Type Conversion

The char data type is used to store a single UTF-16 code unit in Java. It is commonly used for characters such as letters, digits, and symbols.

Unlike String, which represents a sequence of characters, char represents one character unit. For example, 'A', '7', and '@' can each be stored in a char.

What Is the char Data Type?

The char type is a 16-bit unsigned integer type that represents a UTF-16 code unit. Its values range from '\u0000' to '\uFFFF'.

char grade = 'A';
char digit = '5';
char symbol = '@';

A char literal must normally be written inside single quotes. Double quotes are used for String literals.

Key Point: A Java char occupies 16 bits and stores a UTF-16 code unit, not necessarily a complete Unicode character in every case.

Syntax of char

char variableName = 'character';

For example:

char firstLetter = 'B';
char answer = 'Y';
char specialSymbol = '#';

char Uses Single Quotes

One of the most common beginner mistakes is confusing character literals with string literals.

char letter = 'A';
String word = "A";

The first value is a single char, while the second is a String containing one character.

Remember: Use single quotes for a char and double quotes for a String.

Size and Range of char

Property	Value
Data Type	char
Category	Character
Size	16 bits
Minimum Value	'\u0000' or 0
Maximum Value	'\uFFFF' or 65,535
Default Value for a Field	'\u0000'
Signed	No

char and Unicode

Java uses Unicode so that programs can represent characters from many writing systems rather than being restricted to basic English letters.

char english = 'A';
char symbol = '₹';
char bengali = 'ଓ';

This makes char useful when working with international text. However, Unicode has grown beyond the range of a single UTF-16 code unit, so some Unicode characters require a pair of char values known as a surrogate pair.

Character Escape Sequences

Java provides escape sequences for characters that are difficult or inconvenient to type directly.

char newline = '\n';
char tab = '\t';
char quote = '\'';
char backslash = '\\';

Escape	Meaning
\n	New line
\t	Tab
\'	Single quote
\\	Backslash
\r	Carriage return
\b	Backspace

char and Numeric Values

A char can participate in numeric operations because Java represents it using a numeric UTF-16 code unit value.

char letter = 'A';

int code = letter;

System.out.println(code);

The variable code receives the numeric value associated with the character 'A'.

Adding to a char

Because char participates in numeric expressions, arithmetic operations can produce an int result.

char letter = 'A';

int nextCode = letter + 1;

System.out.println(nextCode);

If you want the result stored back as a char, an explicit cast may be required.

char letter = 'A';

char nextLetter = (char) (letter + 1);

System.out.println(nextLetter);

The output is 'B'.

char and int Conversion

A char can be automatically promoted to an int because its values fit within the integer range.

char letter = 'A';
int value = letter;

The reverse conversion from int to char requires an explicit cast.

int value = 65;
char letter = (char) value;

System.out.println(letter);

The output is 'A' because the numeric value corresponds to the UTF-16 code unit for that character.

char in Conditions

Characters are frequently used in conditions when validating input or checking specific symbols.

char grade = 'A';

if (grade == 'A') {
    System.out.println("Excellent");
}

This pattern is common in grading systems, menu selections, command processing, and character validation.

char in Loops

A char can also be changed inside a loop because it has an underlying numeric value.

for (char letter = 'A'; letter <= 'E'; letter++) {
    System.out.println(letter);
}

The loop prints the characters from A through E.

char vs String

Feature	char	String
Stores	One UTF-16 code unit	A sequence of characters
Literal Syntax	Single quotes	Double quotes
Example	'A'	"A"
Primitive Type	Yes	No
Size	16 bits	Variable length

Common Beginner Mistakes

• Using double quotes instead of single quotes for a char.
• Assuming char can store an entire text or word.
• Forgetting that char is an unsigned 16-bit type.
• Assuming every Unicode character always fits into one char.
• Expecting arithmetic involving char to automatically produce another char.

Best Practices

• Use char when you need a single UTF-16 code unit.
• Use String when working with text or sequences of characters.
• Use character escape sequences when they make special characters clearer.
• Be aware of UTF-16 surrogate pairs when working with Unicode code points outside the Basic Multilingual Plane.
• Use appropriate character-handling APIs when processing international text rather than assuming one char always equals one user-visible character.

Interview Insights

Question: What is the size of char in Java?

Answer: char is 16 bits and represents a UTF-16 code unit.

Question: Is char signed or unsigned in Java?

Answer: char is an unsigned 16-bit type with values from 0 to 65,535.

Question: What is the difference between 'A' and "A"?

Answer: 'A' is a char literal, while "A" is a String containing one character.

char Data Type: Quick Revision

Property	Details
Type	char
Category	Character
Size	16 bits
Minimum	'\u0000' or 0
Maximum	'\uFFFF' or 65,535
Default Field Value	'\u0000'
Signed	No
Literal Syntax	'A'

The char data type connects Java's primitive type system with Unicode text. The most important idea to remember is that Java char represents a 16-bit UTF-16 code unit, not simply an unrestricted "character." Once this distinction is clear, character literals, Unicode values, escape sequences, and character arithmetic become much easier to understand.