1. Null \u0000 in Java String? stackoverflow.comAre there any good reasons not to use \u0000 as a delimiter within a Java String? I would be encoding and decoding the string myself. This is for saving a list of ... |
2. Why do we call null String? stackoverflow.comI like to know why do we call null string. Where Strings are objects in java and objects can not be null only references can be null. Can anybody elaborate on it? ... |
3. Why do I get a NullPointerException when comparing a String with null? stackoverflow.comMy code is breaking on the following line with a nullpointerexception: |
4. String[] initialized by null? stackoverflow.comHi i encountered this problem whereby when i initialized my String[], there seems to be a null in the String[] before i do anything. How do i initialized the String[] to ... |
5. if (str1 == null) when throws a NullPointerException stackoverflow.comIn java, Does the following line have a possibility (even 0.01%) to throw a NullPointerException?? |
6. null = "" for a string stackoverflow.comIn Java are these 2 statements the same? |
7. Why String.valueOf(null) is causing null pointer exception? stackoverflow.comWhy String.valueOf(null) is causing null pointer exception? Where the expected behaviour is to return "null" string. |
8. string concatenation with null stackoverflow.comI have the following code: null.How does java do the trick in string concatenation? |
9. Concatenating null strings in Java stackoverflow.comWhy does the following work? I would expect a |
10. Difference between null and "" Java String stackoverflow.comWhat is the difference between |
11. Should Java String method (local) variables be initialized to null or ""? stackoverflow.comWhat is the best practice for initializing a String method (local) variable to avoid the "Variable might not have been initialized" error in Java? String s=null; or String s=""; Does it make a difference? If so, ... |
12. How to assign "Null" as a value to a string variable in Java stackoverflow.comI am trying to import users from Active directory and in one of the cases, the user has a last name as Null. Can I have some pointers as to how ... |
13. How to evaluate whether a string is null? stackoverflow.comI have a string, which is read from a database. The string can be just "null". I need to decide whether it is null or not? Among the following ... |
14. Getting value of one string variable correctly in Java if i do the debug but same values is null when i run the program stackoverflow.comI am facing pretty weird problem here. I have one java project in eclipse. When I do the debug on program, It returns me value of one String variable properly, But ... |
15. Value "null" by default in String stackoverflow.comI have this class |
16. java.util.properties getProperty method returns null for UTF-8 string stackoverflow.comI have a problem getting localized value (a UTF-8 string) from the properties file. |
17. Java issue with String returning Null value, despite using Scanner class to input data stackoverflow.comI am writing a program for a class that is very simple. All it requires of me is to print a grade sheet, and be able to input 3 pieces of ... |
18. null String vs String "null" coderanch.comHi Ben Zhang , null is a key word used to initialize variables. In your case as you have declared the power variable and initialized it to null, mypower will have the same value. The difference between null and "null" is the later is a specific value similar to"xyz" and the earlier means it has no value, simply blank. If you ... |
19. difference between null string and "" coderanch.comIt's ok but if run the below program it perfectly executes with out error saying that s is not initialized with string value. public class Test { public static void main(String[] args) throws Exception { step1 String s=""; step2 //String s2;//leads to compile time error because no value is initialized System.out.println(s.length()); } } I think step1 an step2 are same. :roll: ... |
20. null or an empty String for "optional" data members coderanch.comI have a Java class that models a business domain object. This business domain object has a number of fields that are represented as String-valued data members in the corresponding class. Some of those String-valued fields are not present in some object instances. Is it better to model such a non-existent (or non-available) field as having an empty String value ("") ... |
21. How do I avoid null pitfalls when comparing Strings? coderanch.comI'm having difficulty coming up with a good solution for comparing string values and avoiding the NullPointerException. Here's what I'm trying to do with half-way decent looking code I'll give the psuedocode: Compare two String values to determine if they are equal. String oldvalue; String newvalue; if oldvalue == newvalue then update = false What is a pretty way to write ... |
22. string and object (null considered string?) coderanch.comHi Margaret, 'null' is really a 'null literal'. It's valid in Java and can be legally assigned to an Object; which is why |
23. null string value coderanch.com |
24. (String) null coderanch.com |
25. null strings coderanch.com |
26. Difference between Null String and Null Object coderanch.com |
27. String and null coderanch.com |
28. string with null value coderanch.com |
29. String is not null, then it is? coderanch.comHi, I'm using 2 classes, Child and Parent. In parent class, there is the abstract method setData() which is implemented in child class. My problem is... setData() instantiates the String s, but when button is pressed, it says s is null. However, if I invoke setData() in Child constructor whilst leaving Parent constructor empty, then a button press says s is ... |
30. Why Java provides the way to access string literals with null reference? coderanch.com |
31. [Solved] String becomes null coderanch.comI'm posting this here instead of the JDBC forum (sorry if that is the wrong guess!), because I don't think the JDBC portion of this is the cause of the problem. I have a String (tName) that is part of a data structure that is becoming null for some reason that I don't understand. Here is what happens: 1) I have ... |
32. Difference between NULL and empty string coderanch.comI think of an empty string ("") as a box that is empty. a null string means you don't even have a box!!! In all cases, you can refer to "the box that holds my comic books". The box may not exist, the box may exist but be empty, or the box may be full. |
33. Absence of NULL in string ? coderanch.comBecause java.lang.String has other ways of specifying where it ends. The length() method is the main one. The reason C uses the NULL character* is because there is no other way to indicate how large an array is. Arrays in C have no hard bounds like arrays in Java have. You can easily try to read "elements" beyond its border. These ... |
34. String add null to begining coderanch.comto take it further (and pretend i have profound knowledge ) Always remember, classes are abstract entities(not to be confused with abstract classes). They are not supposed to execute any code or have sideeffects. I am not sayint they dont, but they are not supposed to. So this is one of the reason, most of the executable statements are tried to ... |
35. Why does String null work this way? coderanch.comManish, Thanks for your reply... Still I am not able to get a clear understanding as why this is happening so. Aditya, When there is no string existing for the two given variables (a and b), how come null and null are getting concatenated??? ok... though I did not get the complete meaning of the replies... May I know whats the ... |
36. How to parse "null" string to null. coderanch.comHi, Thanks, I was a little quick in posting the code, I have changed it so it will compile. Yes this is the code I currently use. I am convinced I have seen some method once, that does the same thing. Perhaps it was in the Apache commons library. We allow users of our custom logging application to provide a "null" ... |
37. Cannot set a String to null? coderanch.comI have the following codes and there are some error that I cannot resolve. (The following codes are in the main method) User u1 = new User("Alfred", 1); String userName = u1.getUserName(); int userId = u1.getUserId(); UniqueSecurityPin uspObj = new UniqueSecurityPin(userName, userId); do{ String pin = UniqueSecurityPin.generateSecPin(); //PIN GENERATION uspObj.setUsp(pin); //PIN IS SET TO USP object Calendar exe = Calendar.getInstance(); exe ... |
38. String output showing "null" java-forums.orgHey guys, beginner here....(Again) here is the latest code i have (2 .java files) and my output it showing "null" for the Part # and part Description when it runs, im new and i don't know what im not doing correctly. Java Code: // Ex3.13 Invoice.java (JHtP page104) //invoice a hardware store might use to represent an invoice //for an item ... |
39. null v/s empty String(" ") java-forums.org |
40. Trim for null string java-forums.org |
41. String becomes null forums.oracle.comI am having a problem where a string is being passed between several methods and then finally to a method in another class, I have tested the string at several points in my program and the string's value is becoming null at the point that it is passed into the method in the other class, here is a simplified example of ... |
42. Null String forums.oracle.com |
43. Difference between String=""; and String =null forums.oracle.comThere's no advantage to any of them that can be applied at all times. Which idiom you choose is dictated by how you need to scope the variable. There's no point assigning a reference to null, and then immediately assigning it to an object, but starting off with it assigned to null, before doing something else, is often useful |
44. Replacing null with "" after String assignment forums.oracle.com |
45. String is set but then instantly becomes null again, why? forums.oracle.comYou're resetting it to null every time the method is called. To be precise you're not even resetting it - it's discarded at the end of the method and reinitialized and reinstantiated. Laszlo's post was rather better put, I feel. Laszlo's post was too vague to understand. And I still don't get it because it can't be discarded at the end ... |
46. Difference between String = "" and String = null forums.oracle.comBecause a null can't be dereferenced (you can't call methods on it). This is the case for all nulls, not just null as a value for String reference variables. The difference between "" and null is that "" is a zero-length string, and null is no string at all. For lack of a better analogy, consider this: take a book, and ... |
47. Please tell basic difference between "" and null for String variable. forums.oracle.com |
48. How does Java Handle String Literals Setting to Null for Identical Values ? forums.oracle.comSuppose, String s1="Java"; String s2="Java"; Now if i am not wrong only one value(bit pattern) "Java" exists in the heap and both s1 and s2 are pointing to it. If i set s1 to null, s1=null; Won't s2 be affected (it is not getting affected actually..) What could be the cause for this ? Thanks in Advance. |
49. Why the string is null? forums.oracle.com |
50. Difference in Null and Empty String forums.oracle.com |
51. String str = null; have a value... forums.oracle.com |
52. is null a String? forums.oracle.com"null" is a String. null, the object reference, is not a string. However, without quotes it might still pick string unless you're explicitly casting null as an Object. Edit: Sorry, just noticed you tried the null reference test. You should get object if you called it with (Object)null. I think, according to the Java spec, it will automatically try to use ... |
53. String reverting to 'null' forums.oracle.comYour loop is explicitly designed to exit when that variable becomes null -- look at it carefully -- so it shouldn't be surprising that after the loop exits, that variable is null. Note that the variable is assigned to in the while-clause, so that's where it becomes null. You won't ever see it having the value null inside the body of ... |
54. Function used to convert null value to empty string forums.oracle.com |
55. String is null - why? forums.oracle.com |
56. empty string vs null string forums.oracle.comWhen a String reference is set to null it does not point to any String at all. When a String reference point to an empty String it errr.... well it points to an empty String, that is to say a String containing no characters. So null is not a String but an empty String is. |
57. Reader returns String "null" forums.oracle.com |
58. Null + String obj forums.oracle.com |
59. Why is the output of the program "String S is null" forums.oracle.com |