Java compiler will create a
Character object under some circumstances.
For example, if a primitive char is passed into a method that expects an object, the char is automatically converted to a Character.
This feature is called autoboxing or unboxing, if the conversion goes the other way.
// The primitive char 'a' is boxed into the Character object ch.
Character ch = 'a';
// 'x' is boxed for method test whose return is unboxed to char 'c'.
char c = test('x');
|
Escape Sequences
A character preceded by a backslash (
\) is an escape sequence:
| Escape sequence | Description |
|---|---|
| \t | Inserts a tab in the text at this point. |
| \b | Inserts a backspace in the text at this point. |
| \n | Inserts a newline in the text at this point. |
| \r | Inserts a carriage return in the text at this point. |
| \f | Inserts a form feed in the text at this point. |
| \' | Inserts a single quote character in the text at this point. |
| \" | Inserts a double quote character in the text at this point. |
| \\ | Inserts a backslash character in the text at this point. |
Character Methods
Instance methods that all the subclasses of the
Character class implement:
| Method | Description |
|---|---|
| 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. |
|
“Let no man pull you so low as to hate him.” ― Martin Luther King Jr., A Knock at Midnight |