primitive « Integer « Java Data Type Q&A





1. Comparing Character, Integer and similar types in Java: Use equals or ==?    stackoverflow.com

I wanted to make sure about something in Java: If I have a Character or an Integer or a Long and those sort of things, should I use equals or is == ...

2. How to present the nullable primitive type int in Java?    stackoverflow.com

I am designing an entity class which has a field named "documentYear", which might have unsigned integer values such as 1999, 2006, etc. Meanwhile, this field might also be "unknown", that ...

3. Inconsistent behavior on java's ==    stackoverflow.com

Consider this code:

class test {
   public static void main(String[] args) {
      test inst_test = new test();
      int i1 = ...

4. Fastest most efficient way to determine decimal value is integer in Java    stackoverflow.com

Given a double variable named sizeValue and sizeValue contains something other than 0, what is the most efficient way to determine that sizeValue contains a value that is an integer? Currently i'm ...

5. Casting a primitive int to a Number    stackoverflow.com

Let's say that I have the following:

int a = 2;
Number b = (Number) a;

System.out.println(b); // Prints 2
http://java.sun.com/docs/books/jls/first_edition/html/15.doc.html#238146 says that a primitive value may not be cast to a reference ...

6. Convert Object into primitive int    stackoverflow.com

How to Convert an Object(not String),like TreeNode.item, into primitive like int.

7. java: Integer equals vs. ==    stackoverflow.com

As of java 1.5, you can pretty much interchange Integer with int in many situations. However, I found a potential defect in my code that surprised me a bit. The following code:

Integer cdiCt ...

8. Can one assign 4 little-endian-ordered bytes of an unsigned integer to a Java primitive using just bitwise operators?    stackoverflow.com

I want to read 4 bytes which are a little-endian encoding of an unsigned 32-bit integer, and assign the value to a Java int (Yes, in reality I will use a ...

9. How to check if number fits primitive type in java?    stackoverflow.com


I need do to some input validation but run into a question and I do not seem to find an answer (even with Google). The problem is simple: I have 2 ...





10. Cast int to double then back to int in java    stackoverflow.com

quick question. Would this always be true?

int i = ...;
double d = i;
if (i == (int) d) ...
Or I need to do rounding to be sure?
if (i == Math.round(d)) ...

11. conversion of String object to integer primitive    coderanch.com

Hi, i am having a field called "Opening Account Balance" in the JSP and i am using a JavaScript file to change its behavior. suppose i enter 245 it will be changed to $245.00 suppose i enter 2453 it will be changed to $2,453.00 suppose i enter 24534 it will be changed to $ 24,534.00 Now i want that amount what ...

12. Primitive int to Integer conversion.    coderanch.com

What do I have to do to convert from primitive int to Integer types? I have this statement and it's always returning zeroes. Integer value; value = new Integer ( (int) Math.random() * 100); yet, value is always zero. What am I doing wrong here? This worked when I stored it back into an int array but not when I convert ...

13. convert primitive int to Object    coderanch.com

14. convert string to primitive integer    coderanch.com





17. a & b works also for int primitives ?    forums.oracle.com

Hello During my lessons java SCJP 5.0 I saw that the & expression also excepts integers as oprands. But how can i predict the outcome of such an expression. For example int a=1,b =1; a++; System.out.println(a & b); // Prints 0 a++; b++; System.out.println(a & b); // Prints 2 I don't understand how Java calculates these outcomes How does the & ...

18. how to convert primitive int to String object    forums.oracle.com

19. About byte, int , long, short primitive.    forums.oracle.com

Hi, I am new to Java. I was trying to write a program that could test the maximum value of integer data type mentioned above. My code like this: public class IntegerTest { public static void main() { byte testbyte = (byte)Math.pow(2,7); short testshort = (short)Math.pow(2,15); int testint = (int)Math.pow(2,31); long testlong = (long)Math.pow(2,63); System.out.println("Test Byte: " +testbyte); System.out.println("Test Short: " ...