Java Character isLetter() Method

The isLetter(char ch) method of Character class determines whether the given(or specified) character is a letter or not.

A character is considered to be a letter if the general category type provided by the Character.getType(ch) is one of the following:

• UPPERCASE_LETTER.
• LOWERCASE_LETTER.
• TITLECASE_LETTER.
• MODIFIER_LETTER.
• OTHER_LETTER

Syntax

Parameter

ch: It is the character that needs to be tested.

Return Value

The isLetter(char ch) method returns a Boolean value i.e. true if the given(or specified) character is a letter. Otherwise, the method returns false.

Example 1

Output:

The character A is a letter: true The character 9 is a letter: false The character e is a letter: true 

Example 2

Output:

The character 1 is a letter: false The character * is a letter: false The character e is a letter: true 

Example 3

Output:

The character 1 is a letter: false The character ) is a letter: false The character * is a letter: false 

Java Character isLetter(int codePoint) Method

The isLetter(int codePoint) method of character class determines whether the given(or specified) character is a letter or not.

A character is considered to be a letter if the general category type provided by the Character.getType(codePoint) is one of the following:

• UPPERCASE_LETTER.
• LOWERCASE_LETTER.
• TITLECASE_LETTER.
• MODIFIER_LETTER.
• OTHER_LETTER

Syntax

Parameter

The above method requires only one parameter:

a.)The codePoint which is the character that needs to be tested.

Return Value

The isLetter(int codePoint)method returns a boolean value i.e. true, if the given(or specified) character is a letter. Otherwise, the method returns false.

Example 4

Output:

The first codePoint 56 is a letter: false The second codePoint 110 is a letter: true The third codePoint 123 is a letter: false The fourth codePoint 315 is a letter: false 

Example 5

Output:

Enter the first input:8 The character '8' is not a letter. Enter the second input:T The character 'T' is a letter. Enter the third input:& The character '&' is a letter.