When can I initialize a final variable in Java?

You can initialize a final variable when it is declared. This approach is the most common. A final variable is called a blank final variable if it is not initialized while declaration.

Can we initialize final variable later?

If you declare a final variable later on you cannot modify or, assign values to it. Moreover, like instance variables, final variables will not be initialized with default values. Therefore, it is mandatory to initialize final variables once you declare them.

Do you have to initialize final variables in Java?

In Java, final is the access modifier which can be used with a filed, class and a method. When a method if final it cannot be overridden. When a variable is final its value cannot be modified further. When a class is final it cannot be extended.

How are final variables initialized Java?

A blank final variable is initialized within instance-initializer block or within a constructor. If you have got one constructor in your class then it should initialize in all of them, otherwise, a compile-time error is thrown. A blank final static variable is initialized within a static block.

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Can we initialize final class in Java?

A final class cannot be subclassed. A final method cannot be overridden by subclasses. A final variable can only be initialized once.

Can you set a final variable?

You can set a final variable only in a constructor or in an initializer. Regular methods cannot change the value of variables declared final .

Do variables declared as final occupy memory?

A final variable will occupy memory somewhere at runtime. However where that memory is depends on the kind of variable that you declare as final . If the variable is a local variable or a method’s formal argument variable, then the memory cell will be on the stack.

When can you initialize a final variable?

You can initialize a final variable when it is declared. This approach is the most common. A final variable is called a blank final variable if it is not initialized while declaration.

Why do we need final keyword in Java?

We can declare Java methods as Final Method by adding the Final keyword before the method name. The Method with Final Keyword cannot be overridden in the subclasses. The purpose of the Final Method is to declare methods of how’s definition can not be changed by a child or subclass that extends it.

How do you assign a value to the final variable in Java?

In Java, non-static final variables can be assigned a value either in constructor or with the declaration. But, static final variables cannot be assigned value in constructor; they must be assigned a value with their declaration.

Can final methods be overloaded?

private and final methods can be overloaded but they cannot be overridden. It means a class can have more than one private/final methods of same name but a child class cannot override the private/final methods of their base class. … Argument list should be same in method Overriding.

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Can final methods be overridden?

No, the Methods that are declared as final cannot be Overridden or hidden.

What is final modifier in Java?

The final modifier keyword makes that the programmer cannot change the value anymore. The actual meaning depends on whether it is applied to a class, a variable, or a method.

When should I use final in Java?

You use the final keyword in a method declaration to indicate that the method cannot be overridden by subclasses. The Object class does this—a number of its methods are final .

Can we declare array as final?

The array arr is declared as final, but the elements of array are changed without any problem. Arrays are objects and object variables are always references in Java. So, when we declare an object variable as final, it means that the variable cannot be changed to refer to anything else.

How do you specify a final class in Java?

A class that is declared with the final keyword is known as the final class. A final class can’t be inherited by subclasses. By use of the final class, we can restrict the inheritance of class. We can create a class as a final class only if it is complete in nature it means it must not be an abstract class.

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