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  • Java Type Casting

Java Type Casting

Type casting is when you assign a value of one primitive data type to another type.

In Java, there are two types of casting:

  • Widening Casting (automatically) - converting a smaller type to a larger type size
    byte -> short -> char -> int -> long -> float -> double

  • Narrowing Casting (manually) - converting a larger type to a smaller size type
    double -> float -> long -> int -> char -> short -> byte

Widening Casting

Widening casting is done automatically when passing a smaller size type to a larger size type:

Example

public class Main {

  public static void main(String[] args) {

    int myInt = 9;

    double myDouble = myInt; // Automatic casting: int to double

 

    System.out.println(myInt);      // Outputs 9

    System.out.println(myDouble);   // Outputs 9.0

  }

}

Narrowing Casting

Narrowing casting must be done manually by placing the type in parentheses in front of the value:

Example

public class Main {

  public static void main(String[] args) {

    double myDouble = 9.78d;

    int myInt = (int) myDouble; // Manual casting: double to int

 

    System.out.println(myDouble);   // Outputs 9.78

    System.out.println(myInt);      // Outputs 9

  }

}

 

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