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Java Type Casting

Date- Dec 31,2022

3526

Narrowing Casting Widening Casting

Hello guys and welcome to Code2Night! In this article, we will delve into the fascinating world of Java Type Casting. Type casting plays a crucial role in programming as it allows us to convert one data type into another, facilitating compatibility and enabling us to manipulate and utilize our data effectively. Whether you're a beginner seeking a solid foundation in Java or an experienced developer looking to improve your skills, this article will provide you with a comprehensive understanding of typecasting in Java and its practical applications. So, let's dive in and explore the intricacies of Java Type Casting together!

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


 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 = 9.78d;
    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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