- Java.lang Package classes
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- Java.lang - Math
- Java.lang - Number
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- Java.lang - Process
- Java.lang - ProcessBuilder
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- Java.lang - StrictMath
- Java.lang - String
- Java.lang - StringBuffer
- Java.lang - StringBuilder
- Java.lang - System
- Java.lang - Thread
- Java.lang - ThreadGroup
- Java.lang - ThreadLocal
- Java.lang - Throwable
- Java.lang - Void
- Java.lang Package extras
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- Java.lang - Exceptions
- Java.lang Package Useful Resources
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Java.lang.Character.isLetter() Method
Description
The java.lang.Character.isLetter(int codePoint) determines if the specified character (Unicode code point) is a letter.
A character is considered to be a letter if its general category type, provided by getType(codePoint), is any of the following −
- UPPERCASE_LETTER
- LOWERCASE_LETTER
- TITLECASE_LETTER
- MODIFIER_LETTER
- OTHER_LETTER
Not all letters have case. Many characters are letters but are neither uppercase nor lowercase nor titlecase.
Declaration
Following is the declaration for java.lang.Character.isLetter() method
public static boolean isLetter(int codePoint)
Parameters
codePoint − the character (Unicode code point) to be tested
Return Value
This method returns true if the character is a letter, false otherwise.
Exception
NA
Example
The following example shows the usage of lang.Character.isLetter() method.
package com.tutorialspoint; import java.lang.*; public class CharacterDemo { public static void main(String[] args) { // create 2 int primitives cp1, cp2 int cp1, cp2; // assign values to cp1, cp2 cp1 = 0x0065; cp2 = 0x007c; // create 2 boolean primitives b1, b2 boolean b1, b2; // check if cp1, cp2 represent letter and assign results to b1, b2 b1 = Character.isLetter(cp1); b2 = Character.isLetter(cp2); String str1 = "Code point cp1 represents a letter is " + b1; String str2 = "Code point cp2 represents a letter is " + b2; // print b1, b2 values System.out.println( str1 ); System.out.println( str2 ); } }
Let us compile and run the above program, this will produce the following result −
Code point cp1 represents a letter is true Code point cp2 represents a letter is false
java_lang_character.htm
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