Blank final field in Java

A variable that is declared as final and not initialized is called a blank final variable. A blank final variable forces the constructors to initialize it.

In other words
The final property of class must have a value assigned before object is created. So the last point where you can assign value to them is constructor.

This is used often for immutable objects.

 public class Foo {

  private final Bar bar;

  public Foo(Bar bar) { = bar;

  public Bar getBar() {
   return new Bar(bar);

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