Double Cannot Dereferenced Error Java
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you, helping each other. Join them; it only takes a minute: Sign up “double Cannot be Dereferenced” toString() - does this alternative form without errors mean the same thing? up vote 0 down vote favorite In the java long cannot be dereferenced following snippet of code the int returns properly, but when I try doing the same thing with a double NetBeans 8.0.2 complains that "double Cannot be Dereferenced" The non-commented out variables work. The commented out variables are double and do not work. @Override public String toString() { return "[" + getAccountNumber() + "], " + super.toString() + ", " + owner.toString() // Error: "Double Cannot be Dereferenced" why? // + ", " + currentBalance.toString() // double cannot be dereferenced compareto + ", " + interestRate.toString() ; } When I rewrite it like this NetBeans doesn't give me an error, but is this effectively the same thing for a double? @Override public String toString() { return "[" + getAccountNumber() + "], " + super.toString() + ", " + owner.toString() // Error: "Double Cannot be Dereferenced" // + ", " + currentBalance.toString() // + ", " + interestRate.toString() // The following seems to work instead: + ", " + Double.toString(currentBalance) + ", " + Double.toString(interestRate) ; } If so, great. No errors. If not, what can I do to make sure that the value of a double returns to the String just as an int would? UPDATE: From the answers I received, it looks like second approach I used works, but the following works just as well: @Override public String toString() { return "[" + getAccountNumber() + "], " + super.toString() + ", " + owner + ", " + currentBalance + ", " + interestRate; } java netbeans return double tostring share|improve this question edited Sep 23 '15 at 14:48 asked Sep 23 '15 at 14:09 Elliander 107111 1 Try String.valueOf(your_double_variable) and same in opposite-direction Double.valueOf(your_String_variable). Ofcourse the values should be convertible. –We are Borg Sep 23 '15 at 14:11 add a comment| 2 Answers 2 active oldest votes up vote 2 down vot
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Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: http://stackoverflow.com/questions/32741911/double-cannot-be-dereferenced-tostring-does-this-alternative-form-without Sign up In Java, what is meant by this “double cannot be dereferenced” error? [duplicate] up vote 0 down vote favorite This question already has an answer here: Double cannot be dereferenced? 3 answers I have the following code : public class RandomCompliment { static final String[] comps = { "gorgeous butterfly!", "strawberry milkshake!", "calm waterfall", "smart cookie", "big genius", "friendly cat" }; http://stackoverflow.com/questions/33463421/in-java-what-is-meant-by-this-double-cannot-be-dereferenced-error public static void main(String[] args) { for (int i = 0; i < 200 ; i++ ) { System.out.print("Good monring, " + comps[(((20) * Math.sin(i)).intValue()) % comps.length]); } } } And it is giving me this error : C:\Misc_Stuff\RandomScratch>javac RandomCompliment.java RandomCompliment.java:14: double cannot be dereferenced System.out.print(" " + comps[ ( ((20) * Math. sin(i)).intValue() ) % comps.length ]); ^ 1 error What is meant by "dereferenced" here ? java share|improve this question edited Nov 1 '15 at 14:55 Matthias J. Sax 7,28021040 asked Nov 1 '15 at 14:47 Coffee 5311962119 marked as duplicate by RealSkepticjava Users with the java badge can single-handedly close java questions as duplicates and reopen them as needed. Nov 1 '15 at 14:57 This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. add a comment| 1 Answer 1 active oldest votes up vote 2 down vote accepted Math.sin(i) returns double. You cannot invoke a method (intValue()) on a double (or any primitive data-type). Instead, you can down-cast double to int: (int) (20 * Math.sin(i)) share|improve
This Site Careers Other all forums Forum: Beginning Java double cannot be dereferenced Accela Moon Greenhorn Posts: 20 posted 12 years ago Hi, can someone briefly explain what does this error https://coderanch.com/t/396212/java/java/double-dereferenced mean? And how to solve it? Thanks. public double price=clientObj.processedObj.price; inputLine = new http://www.dreamincode.net/forums/topic/286310-double-cannot-be-dereferenced/ JTextField (this.price.toString(), 20); inputLine.setBounds (145,210,130,25); inputPanel.add (inputLine); Error: C:\Documents and Settings\Moon\My Documents\Navi Projects\School\ OOPJ Project\Prototype\GPS-Lite v2 Alpha Debugger\SUBSCRIPTION.java:77: double cannot be dereferenced inputLine = new JTextField (this.price.toString(), 20); [ edited to break long lines -ds ] [ April 18, 2004: Message edited by: Dirk Schreckmann ] Mike Gershman Ranch Hand cannot be Posts: 1272 posted 12 years ago this.price is a double, a numeric primitive, not an object. primitives don't have methods. if this.price were a Double, this.price.toString() would work. Mike Gershman SCJP 1.4, SCWCD in process Warren Dew blacksmith Ranch Hand Posts: 1332 2 posted 12 years ago I think you're getting the error because the primitive types - including 'double' - are cannot be dereferenced not objects; they cannot have members, and in particular, don't have a toString() member method. Thus, you can't say price.toString(). Try Double.toString(price). Accela Moon Greenhorn Posts: 20 posted 12 years ago I can use such a method, its listed in the double class in java specs from java webbie, I've imported java.lang.Double.. John Smith Ranch Hand Posts: 2937 posted 12 years ago I can use such a method, its listed in the double class in java specs from java webbie, I've imported java.lang.Double In Java there is double, and there is Double. The former one is a primitive type that has no methods, and the latter is a wrapper class that extends Number and Object, and subsequently has the corresponding methods. In your code, you can use either one, -- but understand the difference. Accela Moon Greenhorn Posts: 20 posted 12 years ago Oh, my bad. I've fixed it, thanks a million! Post Reply Bookmark Topic Watch Topic New Topic Similar Threads Java Double cannot be dereferenced bmi calculation help please! Double compiler error - Help! float cannot be dereferenced constructors with arguments calling const
12 Replies - 6201 Views - Last Post: 23 July 2012 - 05:30 AM Rate Topic: #1 BlackFiredDragon New D.I.C Head Reputation: 0 Posts: 32 Joined: 19-July 12 double cannot be dereferenced Posted 19 July 2012 - 09:10 AM I have an error with this code. It was supposed to use the binary search method in order to find the number 45.3 in this array: [-3, 10, 5, 24, 45.3, 10.5}. At first everything was OK. But then I had a problem with the decimals - because I used 'int'. So I changed a few things and made it 'double' instead of int. Now I get these errors: program-3.java:12: error: double cannot be dereferenced if (a[mid].compareTo (x)<0) ^ program-3.java:14: error: double cannot be dereferenced else if (a[mid].compareTo (x) > 0) ^ 2 errors This is my code: class Binarys { public static final int NOT_FOUND = -1; public static double binarys(double[] a, double x) { int low=0; int high = a.length - 1; int mid; while (low <= high) { mid = (low + high) / 2; if (a[mid].compareTo (x)<0) low = mid + 1; else if (a[mid].compareTo (x) > 0) high = mid - 1; else return mid; } return NOT_FOUND; } public static void main(String[] args) { double[] array = {-3, 10, 5, 24, 45.3, 10.5}; int l = array.length; int a; System.out.println("Original Numbers:"); for (a = 0; a < l; a++ ) { System.out.println(array[a]); } System.out.println("45.3 found at " + binarys(array, 45.3)); } } Please help me with this problem, it's been stuck with me for several days. Thank you! Is This A Good Question/Topic? 0 Back to top MultiQuote Quote + Reply Replies To: double cannot be dereferenced #2 macosxnerd101 Games, Graphs, and Auctions Reputation: 11994 Posts: 44,812 Joined: 27-December 08 Re: double cannot be dereferenced Posted 19 July 2012 - 09:12 AM You can't invoke methods or reference fields on primitives. Since these are numbers, just directly compare them using the >, >= , <, <=, ==, and != operators. You don't need the compareTo() method. Was This Post Helpful? 1 Back to top MultiQuote Quote + Reply #3 Ryano121 D.I.C Lover Reputation: 1460 Posts: 3,286 Joined: 30-January 11 Re: double cannot be dereferenced Posted 19 July 2012 - 09:13 AM You need to use the static method compare inside the