Can the static block have a return type?
A return is not allowed because a static block is not strictly speaking a method. There is no “caller” to return to, and certainly nothing to return a value to.
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Can we declare a static initializer in a local class?
In Java we cannot declare static initializers or member interfaces in a local class (static members can be declared as long as they are final and can be initialized at compile time).
What is static initializer?
Java provides a feature called a static initializer that is specifically designed to allow you to initialize static fields. This is because static initializers are also executed the first time you create an instance. In that case, the static initializers are executed before the constructor is executed.
Where can a final constant instance field be initialized?
A final blank variable can be initialized within the instance initializer block or within the constructor. If you have more than one constructor in your class, it must be initialized in all of them; otherwise, a compile-time error will be generated.
Where do static variable initializers go in a static constructor?
If static field variable initializers are present in the static constructor class, they will be executed in the textual order in which they appear in the class declaration immediately before the static constructor execution.
How are static initialization blocks used in Java 8?
Java 8 object-oriented programming programming instance variables are initialized using initialization blocks. However, static initialization blocks can only initialize static instance variables. These blocks are only executed once when the class is loaded.
Can a class have instance variables and initialization code?
However, Apex classes cannot be static. You can also have instance methods, member variables, and initialization code, which have no modifier, and local variables. Static methods, variables, and initialization code all have these characteristics. They are associated with a class. They are only allowed in outer classes.
Do you need an instance for a static method?
A static method or variable does not require an instance of the class in order to be executed. Before an object of a class is created, all static member variables of a class are initialized and all blocks of static initialization code are executed. These elements are handled in the order they appear in the class.