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:

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:

public class Main {
    public static void main(String[] args) {
        double myDouble = 9.78;
        int myInt = (int) myDouble; // Manual casting: double to int

        System.out.println(myDouble);   // Outputs 9.78
        System.out.println(myInt);      // Outputs 9
    }
}