Is there a default type for numbers in Java

by

This

18

is known as an integer literal. There are all sorts of literals, floating point, String, character, etc.

In the following,

byte b = 3;

the literal 3 is an integer literal. It’s also a constant expression. And since Java can tell that 3 fits in a byte, it can safely apply a narrowing primitive conversion and store the result in a byte variable.

In this

int i = 3;
byte bb = i; //error!

the literal 3 is a constant expression, but the variable i is not. The compiler simply decides that i is not a constant expression and therefore doesn’t go out of its way to figure out its value, a conversion to byte may lose information (how to convert 12345 to a byte?) and should therefore not be allowed. You can override this behavior by making i a constant variable

final int i = 3;
byte bb = i; // no error!

or by specifying an explicit cast

int i = 3;
byte bb = (byte) i; // no error!

More Related Contents:

  1. Large Numbers in Java
  2. Why doesn’t Java throw an Exception when dividing by 0.0?
  3. Why int j = 012 giving output 10?
  4. How do I add an "L" to the end of an integer?
  5. In java, is there anyway to go from a array of objects that got returned to the number of objects in the array? [closed]
  6. How do I generate random integers within a specific range in Java?
  7. Restricting JTextField input to Integers [duplicate]
  8. Why is 08 not a valid integer literal in Java?
  9. Why does the behavior of the Integer constant pool change at 127?
  10. What’s the right way to represent phone numbers?
  11. How to concatenate int values in java?
  12. Format file size as MB, GB, etc [duplicate]
  13. Converting characters to integers in Java
  14. Why do == comparisons with Integer.valueOf(String) give different results for 127 and 128?
  15. How != and == operators work on Integers in Java? [duplicate]
  16. Converting stream of int’s to char’s in java
  17. Extremely large numbers in javascript
  18. Java: How to split a string by a number of characters?
  19. What is the inclusive range of float and double in Java?
  20. Why is default required for a switch on an enum?
  21. Error setting a default null value for an annotation’s field
  22. Is there an efficient algorithm for integer partitioning with restricted number of parts?
  23. sorting integers in order lowest to highest java
  24. Multiplication of two ints overflowing to result in a negative number
  25. Difference between class and type
  26. What is the purpose of the default keyword in Java?
  27. Differences between new Integer(123), Integer.valueOf(123) and just 123
  28. Why does Java think that the product of all numbers from 10 to 99 is 0?
  29. How can I check if a value is of type Integer?
  30. int[] and Integer[] arrays – What is the difference?

Leave a Comment