What is Type Conversion ?

  • Converting a value from one datatype to another.
  • It happens when we convert the smaller datatype into larger datatype.
  • It happens automatically by java.
  • There is no data loss.
  • This is called Implicit Type Conversion or Widening.

Example:

public class Main { public static void main(String[] args) { int number1 = 10; double result = number1; System.out.println(result); } } 
10.0
  • number1 is an integer variable.
  • we assigned number1 to result.
  • so java automatically converted int to double.

What is Type Casting?

  • Converting a value from one data type to another.
  • It happens when we convert a larger data type into a smaller data type.
  • It is manually performed by the programmer.
  • There may be data loss during conversion.
  • This is called Explicit Type Casting or Narrowing Conversion.

Example:

public class Main { public static void main(String[] args) { double number1 = 10.75; int result = (int) number1; System.out.println(result); } }

output:

10
  • number1 is a double variable.
  • We assigned number1 to result using (int).
  • So, we manually converted double into int.
  • The decimal part .75 is removed.