How are integers cast to bytes in Java?

by

This is called a narrowing primitive conversion. According to the spec:

A narrowing conversion of a signed integer to an integral type T simply discards all but the n lowest order bits, where n is the number of bits used to represent type T. In addition to a possible loss of information about the magnitude of the numeric value, this may cause the sign of the resulting value to differ from the sign of the input value.

So it’s the second option you listed (directly copying the last 8 bits).

I am unsure from your question whether or not you are aware of how signed integral values are represented, so just to be safe I’ll point out that the byte value 1111 1111 is equal to -1 in the two’s complement system (which Java uses).

More Related Contents:

  1. Convert boolean to int in Java
  2. How to Convert Int to Unsigned Byte and Back
  3. How to convert a Byte Array to an Int Array
  4. Why does the xor operator on two bytes produce an int?
  5. How do I convert from int to Long in Java?
  6. Convert a string representation of a hex dump to a byte array using Java?
  7. Integer division: How do you produce a double?
  8. Determine if a String is an Integer in Java [duplicate]
  9. How can I prevent java.lang.NumberFormatException: For input string: “N/A”?
  10. Java Byte Array to String to Byte Array
  11. explicit casting from super class to subclass
  12. Convert integer into byte array (Java)
  13. How do I convert Long to byte[] and back in java
  14. In Java 8, is there a ByteStream class?
  15. Java Class.cast() vs. cast operator
  16. Java int to String – Integer.toString(i) vs new Integer(i).toString()
  17. Cast Object to Generic Type for returning
  18. What does an integer that has zero in front of it mean and how can I print it?
  19. How does Java Object casting work behind the scene? [duplicate]
  20. Convert binary string to byte array
  21. Java: why do I receive the error message “Type mismatch: cannot convert int to byte”
  22. Convert short to byte[] in Java
  23. Explicit casting from super-class to sub-class
  24. Comparator with double type
  25. Casting LinkedHashMap to Complex Object
  26. Java casting in interfaces
  27. Java casting order
  28. Can assign integer value to char but can’t assign integer variable to char
  29. Cast via reflection and use of Class.cast() [duplicate]
  30. Searching for a sequence of Bytes in a Binary File with Java

Leave a Comment