Typecasting in Java

Typecasting is used to temporarily change the data type of a value. There are two types of data in Java:

  1. Primitive data types
  2. Non-primitive data types

Java supports widening casting and narrowing casting.

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Widening casting

Widening casting changes a smaller data type to a larger data type. For example, byte → short → char → int → long → float → double.

This type of casting is usually automatic; you do not need to use().

Narrowing casting

Narrowing casting changes the data type from a larger data type to a smaller data type. For example, double → float → long → int → char → short → byte.

Code

Widening casting

class myClass {
    public static void main( String args[] ) {
    int number = 7;
    double doubleNumber = number; // Widening casting: int to double
    System.out.println(number);         // 7
    System.out.println(doubleNumber);   // 7.0
    }
}

Narrowing casting code

class myClass {
    public static void main( String args[] ) {
    double number = 7.3;
    int intNumber = (int) number; // Narrowing casting: int to double
    System.out.println(number);      // 7.3
    System.out.println(intNumber);   // 7
  }
}

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