Java Program to Demonstrate block scope.

Here is a Java Program to Demonstrate block scope

class Scope {
  public static void main(String args[]) {
    int x; // known to all code within main

    x = 10;
    if(x == 10) { // start new scope
      int y = 20; // known only to this block

      // x and y both known here.
      System.out.println("x and y: " + x + " " + y);
      x = y * 2;
    }
    // y = 100; // Error! y not known here 

    // x is still known here.
    System.out.println("x is " + x);
  }
}

Output of Above Java Program
x and y: 10 20
x is 40