After all the discussion, the main important points are that we can use static variables or members inside the non-static methods because all the non-static members shared the same copy of static members. But we cannot use non-static members or variables inside the static methods.
What is a static variable in Salesforce?
For example, if an Apex DML request causes a trigger to fire multiple times, the static variables persist across these trigger invocations. To store information that is shared across instances of a class, use a static variable.
How to use non-static variables in a static method?
Non-static variables and methods are associated with an instance of class. You can only use non-static variables inside non-static methods. If you want use common variables in static and non-static method declare variable as static.
Are static variables static across the server or the organization?
It’s not static across the server or the entire organization. The value of a static variable persists within the context of a single transaction and is reset across transaction boundaries. For example, if an Apex DML request causes a trigger to fire multiple times, the static variables persist across these trigger invocations.
Why do we use static variables in Java?
Using static variables will cause only one instance of the variable to be loaded when the application loads and that variable will not go out of memory until the app is closed. It holds information that is common to all instances on a class and It is shared between them instead of being created a new with each instance.
What is static method?
What is static variable?
How many records are split in Salesforce?
Why do you define static variables in a class?
How often is a static initialization code block initialized?
Can a static variable be accessed through an instance of a class?
Do local variables have to be evaluated before class names?
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Can we use static variable in non static method?
“Can a non-static method access a static variable or call a static method” is one of the frequently asked questions on static modifier in Java, the answer is, Yes, a non-static method can access a static variable or call a static method in Java.
Can a static method call a non static method in Salesforce?
Static methods can not be referenced from a non-static context.
How can static method be used in non static object?
But when we try to call Non static function i.e, TestMethod() inside static function it gives an error - “An object refernce is required for non-static field, member or Property 'Program. TestMethod()”. So we need to create an instance of the class to call the non-static method.
Can we have static and non static method with same name?
A static and non static method can't have the same signature in the same class . This is because you can access both a static and non static method using a reference and the compiler will not be able to decide whether you mean to call the static method or the non static method.
Can I access static variable in instance method?
A static method cannot access a class's instance variables and instance methods, because a static method can be called even when no objects of the class have been instantiated. For the same reason, the this reference cannot be used in a static method.
What is difference between static and non static method in Salesforce?
Difference is that Static method can acces static variable and belongs to the class whereas Non Static method and variables can be accesed only the object of the class. Second Major difference is that Static variable can not be overridden.
Why non static variable are not allowed inside static block?
Non-static variables are part of the objects themselves. To use a non-static variable, you need to specify which instance of the class the variable belongs to. ... In other words, non-static data cannot be used in static methods because there is no well-defined variable to operate on.
Can we call non static from static?
A static method can call only other static methods; it cannot call a non-static method. A static method can be called directly from the class, without having to create an instance of the class. A static method can only access static variables; it cannot access instance variables.
Can non static method be called from a static method reason?
In the static method, the method can only access only static data members and static methods of another class or same class but cannot access non-static methods and variables.
Can a delegate refer a mix of static and non-static methods?
You can have a delegate with a non-static method. That's not true you can delegate to a non-static method from a static context. E.g. MyDelegate del = foo. Bar; is valid even if Bar is not static and the assignment is in a static context.
Can we overload static methods?
Overloading is the mechanism of binding the method call with the method body dynamically based on the parameters passed to the method call. Static methods are bonded at compile time using static binding. Therefore, we cannot override static methods in Java.
Can we call non-static method from Main?
We can call non-static method from static method by creating instance of class belongs to method, eg) main() method is also static method and we can call non-static method from main() method . Even private methods can be called from static methods with class instance.
Using static variables in Salesforce Apex - Stack Overflow
This is happening because the two DML statements insert and update are part of the same Apex transaction and the following excerpt explains it well.. A static variable is static only within the scope of the Apex transaction. It’s not static across the server or the entire organization.
accessing static variables in method - Salesforce Stack Exchange
@DeepakAgarwal - You are calling static variables correctly but before calling them you are have to assign values to those variables. As I can see in your code you are populating values in these static variables in CheckInsurance() & save() methods so If you want to get values from these static variables your method calling sequence should me like: PolicyHolderDetails obj = new ...
Static and Instance Methods, Variables, and Initialization Code
In Apex, you can have static methods, variables, and initialization code. However, Apex classes can't be static. You can also have instance methods, member variables, and initialization code, which have no modifier, and local variables.
How to call a method of a class into another class in apex
You can use two approaches: 1.Use Static methods. You cannot use controller2 instance methods here. public class controller2 { public static string method2(string parameter1, string parameter2) { // put your static code in here return parameter1+parameter2; } ...
static, final, this, super keywords in apex - Salesforce Tutorial
Static, Final, this, super and return keywords in apex: static: This keyword defines a method/variable that is only initialized once, and is associated
What is static method?
These items are handled in the order in which they appear in the class. A static method is used as a utility method, and it never depends on the value of an instance member variable. Because a static method is only associated with a class, it can’t access the instance member variable values of its class.
What is static variable?
A static variable is static only within the scope of the Apex transaction. It’s not static across the server or the entire organization. The value of a static variable persists within the context of a single transaction and is reset across transaction boundaries.
How many records are split in Salesforce?
In API version 20.0 and earlier, if a Bulk API request causes a trigger to fire, each chunk of 200 records for the trigger to process is split into chunks of 100 records. In Salesforce API version 21.0 and later, no further splits of API chunks occur. If a Bulk API request causes a trigger to fire multiple times for chunks of 200 records, governor limits are reset between these trigger invocations for the same HTTP request.
Why do you define static variables in a class?
Instead, define the static variables in a class so that the trigger can access these class member variables and check their static values.
How often is a static initialization code block initialized?
Similar to other static code, a static initialization code block is only initialized once on the first use of the class.
Can a static variable be accessed through an instance of a class?
A class static variable can’t be accessed through an instance of that class. If class MyClass has a static variable myStaticVariable, and myClassInstance is an instance of MyClass, myClassInstance.myStaticVariable is not a legal expression.
Do local variables have to be evaluated before class names?
Local variable names are evaluated before class names. If a local variable has the same name as a class, the local variable hides methods and variables on the class of the same name. For example, this method works if you comment out the String line.
What is static method?
These items are handled in the order in which they appear in the class. A static method is used as a utility method, and it never depends on the value of an instance member variable. Because a static method is only associated with a class, it can’t access the instance member variable values of its class.
What is static variable?
A static variable is static only within the scope of the Apex transaction. It’s not static across the server or the entire organization. The value of a static variable persists within the context of a single transaction and is reset across transaction boundaries.
How many records are split in Salesforce?
In API version 20.0 and earlier, if a Bulk API request causes a trigger to fire, each chunk of 200 records for the trigger to process is split into chunks of 100 records. In Salesforce API version 21.0 and later, no further splits of API chunks occur. If a Bulk API request causes a trigger to fire multiple times for chunks of 200 records, governor limits are reset between these trigger invocations for the same HTTP request.
Why do you define static variables in a class?
Instead, define the static variables in a class so that the trigger can access these class member variables and check their static values.
How often is a static initialization code block initialized?
Similar to other static code, a static initialization code block is only initialized once on the first use of the class.
Can a static variable be accessed through an instance of a class?
A class static variable can’t be accessed through an instance of that class. If class MyClass has a static variable myStaticVariable, and myClassInstance is an instance of MyClass, myClassInstance.myStaticVariable is not a legal expression.
Do local variables have to be evaluated before class names?
Local variable names are evaluated before class names. If a local variable has the same name as a class, the local variable hides methods and variables on the class of the same name. For example, this method works if you comment out the String line.
