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Apex Assignment Help


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What is Apex programming language?


Apex programming language is object based programming language; Apex programming code is strongly typed and runs natively on the server.



DATA TYPE : In Apex, all data types are objects.


Data_type of Apex
Valid_values
‘string’
0(zero) or more unicode_characters.
‘boolean’
1(true) or 0(false)
‘date’
date only; no_time information is included.
‘datetime’
date and time value
‘time’
time only; no date information is included
‘integer’
32 bit, whole number (-2 to 2).
‘long’
64 bit, whole number(-263 to 263-1).
‘decimal’
signed number with whole (m, integer) and fractional   components(n), expressed as m.n total length of number, including sign and   decimal point, cannot exceed 19 characters.
‘double’
64 bit signed number with a decimal point.
‘blob’
Binary_data
‘id’
id is variation of the string type to store the unique   identifiers. id values are restricted to 18 characters. values are checked at   compile and runtime, and a stringexception is thrown if they do not conform.
object
object is the generic type. variables defined as object are   essentially type less and can recieve any value. typeless code is vulnerable   to runtime errors beause it is invisible to the compiler's type checking   functionality.


Operators:


OPERATORS
OPERANDS
PRECEDENCE
DESCRIPTION
=
any compatible types
9
assignment
+, -
date, datetime, time
4
add or subtract days on date, datetime,   milliseconds on time, argument must be integer or long
+
string
N/A
string concatenation
+, -, *, /
integer, long, double, decimal
4
numeric add, subtract, multiply, divide
!
boolean
2
logical negation
-
integer, long, double, decimal
2
arithmetic negation
++, --
integer, long, double, decimal
1
unary increment, decrement
&, |, ^
integer, long, boolean
10
bitwise AND, OR, XOR
<<, >>, >>>
integer, long
10
Signed shift_left, signed shift_right,   unsigned shift_right
==, <, >, <=, >=, !=
-any compatible types
5(<, >, <=, >=), 6(==, !=)
not case sensitive, locale sensitive   comparisons; equality, less_than, greater_than, less_than or equal_to,   greater_than or equal_to, not equal to
&&, | |
-boolean
7(&&), 8(||)
-AND, OR, with short circuiting behavior   (second argument is not evaluated if first argument is sufficient to   determine result)
===, !==
-map, list, set, enum, object
N/A
-exact equality, exact inequality
( )
-any
1
-group an expression and increase its   precedence
? :
-boolean
N/A
-shortcut for if/then/else expression


Loops:


Name
syntax
Description
Do while loop
do { code_block}
while (condiltion);
executes code block as long as boolean condition is true. evaluates   condition after running code block, executing the code block at leas once.
while loop
while (condition) {
code_block; }
executes code block as long as boolean condition is true. evaluates   condition before running code block, so code block might not be executed at   all
traditional for loop
dor (init; exit
condition; increment)
{code_clock;}
executes init statement once. loop on the following steps: exit loop if   boolean executes code block, executes increment statement.
list/set iteration for loop
for (var : list/set)
{code_block}
for every element of the list or set, assigns var to the current element   and executes the code block. cannot modify the collection while iterating.


 

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