Literals

1.       Literals :

Literal is a constant assigned to the variable to prepare java application. Java has provide the following list of Literals

>>int a=10;

>>intàdata type

>>aàvariable

>>=àoperator

>>10àcontent [Literals]

>>;àSpecial Symbol

1.        Integer group  literals / integer literals :

>> byte, short, int, long, à0,20,30………

>>char---------à ‘a’, ‘b’, ‘\t’, ‘\n’, ………….

2.       Floating point literals

>>float à12.22f, 23.234f

>>doubleà22.22, 67.456………………..

3.       Boolean literals

>>Boolean -àtrue, false.

4.       String literals

>>String --à”abc”, “xyz”……………….

Note:-

To improve readability over the number JAVA7 has provided a flexibility like to include ‘_’ symbols in the number.

Ex:-

>>float f=1_23_45_678_2346f;

>>System.out.println(f);

If we provide ‘_’ symbol in the number, compiler will remove all the provided ‘_’ symbol from number, compiler will reformat that number as original number, where compiler and JVM will process that number as original number and JVM will generate output that number without ‘_’ Symbols.

Date :30- july-2016

Number System in Java  

To prepare number s in programming’s language’s, we have to use either if the following Nuber Systems.

1.       Binary Number System (BASE-2)

2.       Octal Number System (BASE-8)

3.       Decimal Number System (BASE-10)

4.       Hexa Decimal Number (BASE-16)

Note:-

All the above number system’s are allow in java but default number system In java is “decimal number system”.

1.       Binary Number System (BASE-2) :

To prepare number in  binary number system, we have to use symbols like 0’s and 1’s but, the prepared number must be prefixed with ‘0b’ or ‘0B’.

Ex:-

>>int i=10;àIt is not binary \, it is decimal

>>int b=0b1010;àValid

>>int c=0B1010;àValid

>>int d=oB1010;àInvalid

>>int e=0b1020;àInvalid

Note:-

Binary number system is not supported by JAVA6  version, binary number system is support by JAVA7 Version.

2.       Octal Number System(BASE-8) :

Octal Number System to prepare number is octal number system, we have to use the symbol like 0, 1, 2, 3, 4, 5, 6 and 7. But, the provide number must be prefixed with ‘0’[zero].

Ex:-

                       int a=10;àint is not octal, it is decimal

                       int b=010234;àValid

                       int c=o3456;àInvalid

                       int d=03456;àValid

                       int e=05678; àInvalid

3.       Decimal Number system (BASE-10) :

To prepare numbers in decimal number system, we have to use the symbols like 0,1,2,3,4,5,6,7,8,9 and the number not be prefixed with any symbol

4.       Hexa Decimal Number System (BASE-16): 

To prepare number in Hexa Decimal Number System, we have to use the Symbols like 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e and f, but the number must be prefixed with either ‘0x’ or ‘0X’.

Ex:-

                       int a=10;àValid,, it is not hexa decimal, it is decimal

                       int b=0X123456;àValid

                       int c=0x789abc;àValid

                       int d=0xdef;àValid

                       int e=0Xefg;àInvalid

Note:-

If we compile java program the compiler will recognize the provided number and its number system, compiler will convert the provide number from the respective number system to decimal number system, compiler and JVM will process that number as decimal number and JVM will provide output in decimal number system