Java Data Type Tutorial - Java Character Data Type

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An object of the Character class wraps a char value.

Character class contains isLetter() and isDigit() methods to check if a character is a letter and digit.

The toUpperCase() and toLowerCase() methods convert a character to uppercase and lowercase.

The class provides a constructor and a factory valueOf() method to create objects from a char.

The charValue() method returns the char that the object wraps.

Example

The following code shows how to create Character objects and how to use some of their methods:

public class Main {
  public static void main(String[] args) {
    // Using the constructor
    Character c1 = new Character('A');
//w w w  . j a v  a 2s  . c  o m
    // Using the factory method - preferred
    Character c2 = Character.valueOf('2');
    Character c3 = Character.valueOf('-');

    // Getting the wrapped char values
    char cc1 = c1.charValue();
    char cc2 = c2.charValue();
    char cc3 = c3.charValue();

    System.out.println("c1 = " + c1);
    System.out.println("c2 = " + c2);
    System.out.println("c3 = " + c3);

    // Using some Character class methods on c1
    System.out.println("isLowerCase c1    = " + Character.isLowerCase(cc1));
    System.out.println("isDigit c1    = " + Character.isDigit(cc1));
    System.out.println("isLetter c1    = " + Character.isLetter(cc1));
    System.out.println("Lowercase of  c1    = " + Character.toLowerCase(cc1));

    // Using some Character class methods on c2
    System.out.println("isLowerCase c2    = " + Character.isLowerCase(cc2));
    System.out.println("isDigit c2    = " + Character.isDigit(cc2));
    System.out.println("isLetter c2    = " + Character.isLetter(cc2));
    System.out.println("Lowercase of  c2    = " + Character.toLowerCase(cc2));

    System.out.println("Uppercase of  c3    = " + Character.toUpperCase(cc3));

  }
}

The code above generates the following result.

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