Java - Data Types char type

What is char type?

Java char data type is a 16-bit unsigned primitive data type.

char type represents a Unicode character.

char type is an unsigned data type. A char variable cannot have a negative value.

The range of the char data type is 0 to 65535, which is the same as the range of the Unicode set.

char literal

A character literal represents a value of the char data type.

A character literal in Java can be expressed in the following formats:

• A character enclosed in single quotes
• A character escape sequence
• A Unicode escape sequence
• An octal escape sequence
• The following snippet of code assigns values to char variables using single quotes.

char c1 = 'A'; 
char c2 = 'a'; 
char c3 = '5'; 
char c4 = '@'; 
  

Characters enclosed in double quotes is a String literal. You cannot mix char type and String type.

  
char c1 = 'A';     // OK 
String s1 = 'A';   // An error. Cannot assign a char 'A' to a String s1 
String s2 = "A";   // OK. "A" is a String assigned to a String variable 
String s3 = "ABC"; // OK. "ABC" is a String literal 
char c2 = "A";     // An error. Cannot assign a String "A" to char c2 
char c4 = 'AB';    // An error. A character literal must contain only one character 

Exercise

• Write code to swap String Case via Character helper method
• Write code to capitalize the first letter of a string
• Write code to check if a char is Capital
• Write code to check if a char is Alphabet
• Write code to check if a char is Alphabet Or Numeric
• Write code to check if a char is Upper English Character
• Write code to check if a string is Alphanumeric Or Underscore
• Write code to walk backward to find if a char within srcString is in validString
• Write code to count Occurrences of a char inside a string
• Write code to check if a string is Number by checking each single letter
• Control for loop with characters
• Add value to a character

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