In this program, we will create a class that contains an Instance Initializer Block, which is used to initialize Instance data members.

Program/Source Code:

The source code to initialize Instance Data Member using Instance Initializer Block is given below. The given program is compiled and executed successfully.

// Java program to initialize Instance Data Member 
// using Instance Initializer Block

class Sample {
  int num;

  //Instance Initializer Block
  {
    num = 200;
  }

  //Constructor    
  Sample() {
    System.out.println("Num is: " + num);
  }

}

public class Main {
  public static void main(String[] args) {
    Sample S = new Sample();
  }
}

Output:

Num is: 200

Explanation:

In the above program, we created two classes Sample and Main. The Sample class contains an instance member num, and Instance Initializer Block to initialize data members. It also contains a constructor.