Java: Subtract ‘0’ from char to get an int… why does this work?

by

That’s a clever trick. char’s are actually of the same type / length as shorts. Now when you have a char that represents a ASCII/unicode digit (like ‘1’), and you subtract the smallest possible ASCII/unicode digit from it (e.g. ‘0’), then you’ll be left with the digit’s corresponding value (hence, 1)

Because char is the same as short (although, an unsigned short), you can safely cast it to an int. And the casting is always done automatically if arithmetics are involved

More Related Contents:

  1. Creating a program to file criminal cases and then view them, with new case being allowed to add
  2. Why exception occurs in this program?
  3. error: exception java.io.FileNotFoundException
  4. Java number sign and asterisk [closed]
  5. How to initialize an array in Java?
  6. Is it possible to switch to an element in a frame without using driver.switchTo().frame(“frameName”) in Selenium Webdriver Java?
  7. Why is String.chars() a stream of ints in Java 8?
  8. Jackson Vs. Gson [closed]
  9. Static nested class in Java, why?
  10. What is the use of marker interfaces in Java?
  11. How to get the first non-null value in Java?
  12. XML serialization in Java? [closed]
  13. How do I check that a Java String is not all whitespaces?
  14. CSV parsing in Java – working example..? [closed]
  15. paintComponent() vs paint() and JPanel vs Canvas in a paintbrush-type GUI
  16. Unable to connect to Postgres DB due to the authentication type 10 is not supported
  17. Why should I use Deque over Stack?
  18. Invalid signature file digest for Manifest main attributes exception while trying to run jar file
  19. How to skip initial data and trigger only new updates in Firestore Firebase?
  20. Deep copy of an object array
  21. Android – Prevent white screen at startup
  22. What port is used by Java RMI connection?
  23. How to redirect to the homepage if the user accesses the login page after being logged in?
  24. java.net.SocketException socket is closed
  25. Correct way to check Java version from BASH script
  26. no suitable HttpMessageConverter found for response type
  27. In Java, how can I redirect System.out to null then back to stdout again?
  28. Check if two date periods overlap [duplicate]
  29. Jaxb: how to unmarshall xs:any XML-string part?
  30. How to detect all the Devices connected in a WiFi network from Android App

Leave a Comment