salesforce in Apex language similar to Java
Apex There are several commonly used in data types:
Common basic data types: Integer, String, Boolean, Double, Long, ID, Decimal
Date Time Type: Date, Time, Datetime
Other: Object
In these basic data types, the initial values are null
(A) basic data types
1.Integer
32 does not include a decimal point. Minimum integer is 2,147,483,648, a maximum of 2,147,483,647. E.g:
Integer i = 1;
2.String
Enclosed by a single quote character set up, there is no limit on the number of characters, HTML tags can be used, all the strings are also used escape character, with the Java. When used in the string comparison operators SOQL in a case-insensitive.
String str = 'Hello World';
3.Boolean
True or false must be assigned at initialization, otherwise null
4.Double
64 contains a decimal point.
5.Long
64 does not include a decimal integer in the range -2 ^ 63-2 ^ 63-1. Type Integer can directly convert a Long, Long type without exceeding the range () method to transfer through an Integer intValue.
Long l = 2147483648L;
6.ID
Lightning Platform valid record identifier 18 characters. If the setting is 15, Apex convert the value to 18. Invalid ID anomalies occur at run time.
ID id = '00300000003T2PGAA0';
7.Decimal
Currency field is automatically assigned a Decimal type, similar to Java in the float.
Decimal d = -3.14；
(B) the date and time type
1.Date
It represents the value of a specific date, does not contain information relevant time. Date value can be returned from date plus or minus Integer value.
2.Time
It represents the value of a specific time. Time value must always use the system to create a static method.
3.DateTime
Datetime type declaration of a target date and time, consists of two parts: the date and time. Datetime no constructor initializes only if instantiated by the static method.
(C) Other types
1.Object
Apex support any data type. All Apex data types inherit from Object. More specifically, the object may be represented cast data types for data type basis. E.g:
Object obj = 10;
Integer i = (Integer)obj;