Java Type Casting Examples

We can convert one data types into another data type using casting when narrowing happens in case widening happens, no casting is required. 

Narrowing Conversion

Narrowing refers to passing a higher size data type like int to a lower size data type like short. It may lead to data loss. Following program output will be 44.

public class MyFirstJavaProgram {
   public static void main(String []args) {
      int a = 300;
      byte b = (byte)a; // narrowing
      System.out.println(b);
   }
}

Widening/Promotion Conversion

Widening refers to passing a lower size data type like int to a higher size data type like long. 

public class MyFirstJavaProgram {
   public static void main(String []args) {
      int a = 300;
      long b = a;
      System.out.println(b);
   }
}