character input in java | how to take multiple character input in java

Character in Java

Java provides a wrapper class Character in java.lang package. An object of type Character contains a single field, whose type is char.

·         Creating a Character object :

Character ch=new Character(‘a’);

The above statement creates a Character object which contain ‘a’ of type char. There is only one constructor in Character class which

expect an argument of char data type.

·         If we pass a primitive char into a method that expects an object, the compiler automatically converts the char to a Character class object. This feature is called Autoboxing and Unboxing.

·         Note : The Character class is immutable like String class i.e once it’s object is created, it cannot be changed.

how to read charecter using all class

     Methods in Character Class :

1.    boolean isLetter(char ch) : This method is used to determine whether the specified char value(ch) is a letter or not. The method will return true if it is letter([A-Z],[a-z]), otherwise return false. In place of character, we can also pass ASCII value as an argument as

char to int is implicitly typecasted in java.

Syntax :

boolean isLetter(char ch)

Parameters :

ch - a primitive character

Returns :

returns true if ch is a alphabet, otherwise return false

Example: // Java program to demonstrate isLetter() method public class Test {     public static void main(String[] args)     {         System.out.println(Character.isLetter('A'));                     System.out.println(Character.isLetter('0'));                  } }

Output:

true

false

2.    boolean isDigit(char ch) : This method is used to determine whether the specified char value(ch) is a digit or not. Here also we can pass ASCII value as an argument.

Syntax :

boolean isDigit(char ch)

Parameters :

ch - a primitive character

Returns :

returns true if ch is a digit, otherwise return false

Example: // Java program to demonstrate isDigit() method public class Test {     public static void main(String[] args)     {         // print false as A is character         System.out.println(Character.isDigit('A'));                     System.out.println(Character.isDigit('0'));                 } }

Output:

 False

True

3.    boolean isWhitespace(char ch) : It determines whether the specified char value(ch) is white space. A whitespace includes space, tab, or new line.

Syntax :

boolean isWhitespace(char ch)

Parameters :

ch - a primitive character

Returns :

returns true if ch is a whitespace.

otherwise return false

Example: // Java program to demonstrate isWhitespace() method public class Test {     public static void main(String[] args)     {         System.out.println(Character.isWhitespace('A'));          System.out.println(Character.isWhitespace(' '));          System.out.println(Character.isWhitespace('\n'));          System.out.println(Character.isWhitespace('\t'));                     //ASCII value of tab         System.out.println(Character.isWhitespace(9));                    System.out.println(Character.isWhitespace('9'));      } }

Output:

False

True

True

True

True

False

4.    boolean isUpperCase(char ch) : It determines whether the specified char value(ch) is uppercase or not.

Syntax :

boolean isUpperCase(char ch)

Example: // Java program to demonstrate isUpperCase() method public class Test {   public static void main(String[] args)   {     System.out.println(Character.isUpperCase('A'));     System.out.println(Character.isUpperCase('a'));     System.out.println(Character.isUpperCase(65));    } }

Output:

true

false

true

5.    boolean isLowerCase(char ch) : It determines whether the specified char value(ch) is lowercase or not.

Syntax :

boolean isLowerCase(char ch)

Example:

// Java program to demonstrate isLowerCase() method public class Test {   public static void main(String[] args)   {     System.out.println(Character.isLowerCase('A'));      System.out.println(Character.isLowerCase('a'));      System.out.println(Character.isLowerCase(97));     } }

Output:

False

True

False