Java literals

Java literals

• 1.
  Java Literals • Literalin Java refer to fixed values that do not change during the execution of the program • Java supports several types of constants • Integer Literal • Real Literal • Character Literal • String Literal • Backslash Literal 1
• 2.
  Integer Literals • Aninteger literal refers to sequence of digits • Integers are of three types • They are • Decimal Integer • Octal Integer • Hexa Decimal Integer 2
• 3.
  Decimal Integer • DecimalIntegers consists of a set of digits from 0 to 9,preceeded by an optional minus(-) sign eg. : +999,-999 • Embedded spaces ,commas and non-digit characters are not permitted in between digits eg. 99 999, 99,999 , $999 are illegal numbers. 3
• 4.
  Octal Integer • Anoctal integer consists of any combination of digits from 0 to 7 with a leading zero(0) eg. 045,063,026 etc., 4
• 5.
  Hexa Decimal Integer •A sequence of digits preceded by 0x or 0X is considered as hexa decimal integers • They may also include alphabets from A to F or a to f • Letters from a to f represents the numbers from 10 to 15 eg. 0xd,0XF etc., 5
• 6.
  Real Literals • Numberscontaining fractional parts are called real literals eg. 9.999,0.999 etc., • The numbers are also expressed in exponential notation eg. 999.9 may be written as 9999E-3.E-3 mean multiply by 10-3 6
• 7.
  Single Character Literals •A single character constant contains a single character enclosed with a pair of single quote marks „ „ eg. „m‟ 7
• 8.
  String Literals • AString Literal is a sequence of characters enclosed between double quote marks “ “ • The characters may be alphabets, digits, special characters and blank spaces eg. “neelu” 8
• 9.
  Backslash Literals • Java supports some special back slash character literals • They are used in output formatting methods eg. n stands for new line t stands for horizontal tab b stands for blank space v stands for vertical tb a stands for a small beep 9