Assigning Values to Final Variables in Java

In Java, a final variable can only be assigned a value once, either during declaration or later. A blank final variable is a final variable that is not initialized during declaration. To assign a value to a blank final variable, it must be done in the constructor of the object. If a class has multiple constructors or overloaded constructors, the blank final variable must be initialized in all of them. However, constructor chaining can be used to simplify the process.

Here's an example:

java
class Test {
    final int i;

    Test(int x) {
        i = x;
    }
}

In this example, i is a blank final variable. It is assigned a value in the constructor of the Test class. When an object of Test is created, i is initialized with the value passed to the constructor.

Blank final variables are often used to create immutable objects, which are objects that cannot be changed once initialized. This is because the value of the blank final variable cannot be changed after it is assigned in the constructor.