lecture 3-programming language

Java Characters:
Normally, when we work with characters, we use primitive data types char.
Example:
char ch = a ;
Character Methods:
? isLetter( ) Determines whether the specified char value is a letter.
? isDigit( ) Determines whether the specified char value is a digit.
? isWhitespace( ) Determines whether the specified char value is white space.
? isUpperCase( ) Determines whether the specified char value is uppercase.
? isLowerCase( ) Determines whether the specified char value is lowercase.
? toUpperCase( ) Returns the uppercase form of the specified char value.
? toLowerCase( ) Returns the lowercase form of the specified char value.
? toString( ) Returns a String object representing the specified character value that is, a one-character string.
All these Methods call after character.Method
public class Test {
public static void main(String args[]) {
System.out.println(Character.isLetter( c ));
System.out.println(Character.isLetter( 5 ));
System.out.println(Character.isDigit( c ));
System.out.println(Character.isDigit( 5 ));
}
}
This produces the following result: