Why use instance initialization block in Java?

The instance initialization block is similar to the constructor. It is called once for each object and can be used to set initial values ​​for instance variables. See example below.

Live Demo

<pre class='brush:php;toolbar:false;'>public class Tester {
   public int a;
   { a = 10; }
   public static void main(String[] args) {
     System.out.println(new Tester().a);
   }  
}

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