1.7 v Enhancements with respect to literals

-


1.7 v Enhancements with respect to literals

 1) Binary Literals :- For integral data types untill 1.6 v we can specify literal in the following ways.
*Decimal
*Octal
*Hexa Decimal
But from 1.7 v onwards we can specify literal value even in binary form also. Allowed digits are 0 & 1
Literal value should be prefixed with 0b or 0B.
ex: int x = 0b111; or int x = 0B1111;

2) Usage of underscore symbol in numeric letter. From 1.7 v onwards we can use underscore symbols between digits of numeric literal.
ex: double d = 1_23_456.7_8_9;
The main advantage of this approach is to improve the readability of code.
At the time of compilation these underscoe symbols will be removed automatically.

3) We can use more than 1 underscore symbols also between the digits.
ex: double d = 1___3_4_56.78_9; valid

4)  We can use underscore symbols only between the digits. If we are using anywhere else, we will get compile time error.
ex: double d = _1_2_3.4_5;  //CE
double d = 1_2_4_5.6_7_; //CE
double d = 1_2_3_.6_7; //CE




byte (1) -->  short(2) -->  int(4) --> long(8) --> float(4) --> double(8)
  ^
  |
                                    char(2)

* 8 byte long value we can assign to 4 byte float variable because both are following different memory representation completely.

float f = 10l;
o/p = 10.0

Comments

Post a Comment

Popular posts from this blog

Variables (Part-1)

-
Image
TYPES OF VARIABLES BASED ON TYPE OF VALUE REPRESENTED   P rimitive variable.   R eference variable BASED ON POSITION OF DECLARATION AND BEHAVIOR   Instance variable   Static variable   L ocal variable Base d  on type of value represented by a variable : Primitive Variables : used to represent primitive values: Ex int x = 10; Reference Vari ab les : used to refer object. Ex: Student s = new Student(); Based on position of declaration and behavior : Instance Variable : If the value of a variable is varied from object to object. Such type of variables are called instance variable For every object a separated copy of instance will be created. WHERE TO DECLARE INSTANCE VARIABLE: Instance variable should be declare within the class directly but outside of any method, block or constructor. WHEN INSTANCE VARIABLE WILL BE CREATED: At the time of object creation & destroyed at the time of object destruction. ...
Read more

length vs length()

-
Image
l  length : length is a final variable applicable for arrays. length variable represents the size the array . int[] x = new int[4]; System.out.println(x.length());   CE: c a nnot find symbol method length() System.out.println (x.length);     4   l  length () : length() method is final method applicable for string objects. length() method return number of characters present in the string. Interview Question : Que: string[] s = {"a","aa","aaa"}; s.length;     3 s.length(); CE: cannot find symbol method length() in class   String[]. s[0].length(); 1 In Multi dimensional array length variable represents only base size not the total size. ex:  int[][] x = new int[6][3]; x.length; --> 6 There is no direct way to find total length of multi dimensional  array but indirectly we can find as follows: x[0].length + x[1].length + ........x[n].length;
Read more

Arrays in Java

-
Image
TOPICS 1.  I ntroduction 2.  Array Declaration 3.  Array Creation 4.  Array Initialization 5.  Array declaration,creation & initialization  in single line 6.  length vs lengt h () 7.  Anonymous Arrays 8.  Array element assignment 9.  Array variable assignment INTRODUCTION An array is an indexed collection of fixed no. of homogeneous data elements. The main advantage of array is we can represent huge number of values by using single variable so that readability of code will be improved. but the main disadvantage of array is fixed in size i.e, once we creates an array , there is no chance of increase or decrease o f  size based on our requirement. Hence to use array we should know the size in advance, which may not possible always. ARRAY DECLARATION   ONE DIMENSIONAL ARRAY                    int[] x;    --> Recomm...
Read more