Double Cannot Be Dereferenced Error Java
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Java Error Char Cannot Be Dereferenced
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Java Long Cannot Be Dereferenced
the same thing? up vote 0 down vote favorite In the 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() + ", " double cannot be dereferenced compareto + owner.toString() // Error: "Double Cannot be Dereferenced" why? // + ", " + currentBalance.toString() // + ", " + 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_varia
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company double cannot be dereferenced equals Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs double cannot be dereferenced intvalue Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, long cannot be dereferenced error java just like you, helping each other. Join them; it only takes a minute: Sign up Double cannot be dereferenced…? up vote 1 down vote favorite import java.awt.Rectangle; import java.util.Comparator; public class RectangleComparator implements Comparator { public int http://stackoverflow.com/questions/32741911/double-cannot-be-dereferenced-tostring-does-this-alternative-form-without compare(Object object1, Object object2) { Rectangle rec1 = (Rectangle) object1; Rectangle rec2 = (Rectangle) object2; return rec1.getWidth().compareTo(rec2.getWidth()); } } For some reason, I'm getting the error double cannot be dereferenced. Can anyone help me figure out why? java share|improve this question edited Sep 9 '13 at 4:56 asked Sep 9 '13 at 4:50 user2760309 3314 BTW, it's rarely a good idea to compare float/double values for exact equality. See stackoverflow.com/questions/4915462/… –sleske Sep 9 http://stackoverflow.com/questions/18691643/double-cannot-be-dereferenced '13 at 5:00 add a comment| 3 Answers 3 active oldest votes up vote 3 down vote accepted rocketboy is correct with regard to why this is happening. Consider using the Double wrapper class like this new Double(rec1.getWidth()).compareTo(rec2.getWidth()); Only the first value need to be converted to a wrapper Double, the second one will be auto boxed. share|improve this answer answered Sep 9 '13 at 4:56 Thihara 4,99411538 1 You should not use new Double(…) at all. Please get into the habit of using Double.valueOf(…) as this will allow Java to reuse existing objects. Of course that’s even more important for small integers or longs. –Michael Piefel Sep 9 '13 at 6:39 @MichaelPiefel Does this depend on the implementation or am I missing something? The Double.valueOf(double d) seem to be just calling new Double(double d) under the wraps. –Thihara Sep 9 '13 at 7:15 That’s correct (for my Oracle JDK) – but it just might be better, as the comment there suggests. It’s actually implemented for integers and longs between -128 and 127. I wonder if there really is an implementation that caches more and whether that is actually more efficient in any way. –Michael Piefel Sep 9 '13 at 8:54 I checked in the openjdk 1.6 and 1.7. There's no way caching
This Site Careers Other all forums Forum: Java in General Java Double cannot be dereferenced Megan Hart Greenhorn Posts: 6 posted https://coderanch.com/t/519820/java/java/Java-Double-dereferenced 5 years ago Hi All, I am very new to http://forums.macrumors.com/threads/java-double-cannot-be-dereferenced.853780/ Java and I am getting a 'Double cannot be dereferenced' error when I try to compile this code. public void actionPerformed(ActionEvent e) { Object source = e.getSource(); if (source == exitButton) System.exit(0); else if (source == calculateButton) { double sideAValue = Double.parseDouble(sideAField.getText()); double cannot be sideBValue = Double.parseDouble(sideBField.getText()); double sideCValue = Math.hypot(sideAValue, sideBValue); sideCValue.setText(Double.toString(sideCValue)); The above section of code is part of a larger program that calculates the hypotenuse of a right triangle when the user enters the two smaller sides. The error comes from this line of code: sideCValue.setText(Double.toString(sideCValue)); Could someone please help me to know how cannot be dereferenced to fix this? Christophe Verré Sheriff Posts: 14691 16 I like... posted 5 years ago Shouldn't that be sideCField.setText(Double.toString(sideCValue)); [My Blog] All roads lead to JavaRanch Christophe Verré Sheriff Posts: 14691 16 I like... posted 5 years ago And welcome to the ranch Next time you want to post some code, don't forget to UseCodeTags. This will be make it easier to read. [My Blog] All roads lead to JavaRanch Megan Hart Greenhorn Posts: 6 posted 5 years ago Yes it should be! Thanks for alerting me to that error. I will be sure to use code tags next time around! Thanks for the welcome! Post Reply Bookmark Topic Watch Topic New Topic Similar Threads creating a new JPanel from another JPanel "choice" button Double compiler error - Help! Help w/ Data Input Error Double compiler error - Help! Not being able to compile All times are in JavaRanch time: GMT-6 in summ
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