Java Type Casting - Type Casting in Java
Java Type Casting - Type Casting in Java
- Type casting is when a value of one primitive data type is assigned to another primitive data 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 TypeCasting {
public static void main(String[] args) {
// TODO Auto-generated method stub
int myInt = 9;
double myDouble = myInt; // Automatic casting: int to double
System.out.println(myInt); // Outputs 9
System.out.println(myDouble); // Outputs 9.0
}
}
Output
9
9.0Narrowing Casting
- Narrowing casting must be done manually by placing the type in parentheses in front of the value:
public class TypeCasting {
public static void main(String[] args) {
// TODO Auto-generated method stub
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
}
}Output
9.78
9