why do we use instance block in java code example

Example 1: instance block in java

Instance Block
Executes in each object creation. 
  Constructor is executed even if
    you don't create one, compiler does it
    but initially, you have to declare it.

Example 2: what is instance block in java

Instance Block
Executes in each object creation. 
  Constructor is executed even if
    you don't create one, compiler does it
    but initially, you have to declare it.