Typecasting in Java

Typecasting in Java is assigning a value of one type to a variable of another type. When you assign value of one data type to another, the two types might not be compatible with each other. If the data types are compatible, then Java will perform the conversion automatically known as Automatic Type Conversion (Widening ) and if not then they need to be casted or converted explicitly(narrowing).

2 types of Type Casting in java –

  1. Automatic Type Conversion (Widening – implicit)
  2. Narrowing (Explicit)

typecasting in java

Widening or Automatic Type Conversion

Widening conversion takes place when two data types are automatically converted. This happens when:

  • The two data types are compatible.
  • When we assign value of a smaller data type to a bigger data type.

Example Program of Automatic Type Conversion (Widening) –

Run Online

Output
Int value 100
Long value 100
Float value 100.0
Narrowing or Explicit Type Conversion

If we want to assign a value of larger data type to a smaller data type we perform explicit type casting or narrowing.

  • This is useful for incompatible data types where automatic conversion cannot be done.
  • Here, target-type specifies the desired type to convert the specified value to.

Example Program of Explicit Type Conversion (Narrowing) –

Run Online

Output
Double value 100.04
Long value 100
Int value 100

One thought on “Typecasting in Java

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