THE WORLD'S LARGEST WEB DEVELOPER SITE

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 MyClass {
  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
  }
}
Run example »

Narrowing Casting

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

Example

public class MyClass {
  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
  }
}
Run example »