Java Error Cannot Be Resolved
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String Cannot Be Resolved To A Variable Java
Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each variable cannot be resolved oozie other. Join them; it only takes a minute: Sign up Variable cannot be resolved up vote 1 down vote favorite I am trying to create an item list, diffrent for each i and j variable. My code is: if
Var Cannot Be Resolved To A Type Jsp
(i == 0) { if (j == 0) { final CharSequence[] items = {"4:45", "5:00"} } else if (j == 1) { final CharSequence[] items = {"4:43", "4:58"} } else if (j == 2) { final CharSequence[] items = {"4:41", "4:56"} } else { final CharSequence[] items = {"4:38", "4:53"} } ... new AlertDialog.Builder(this) .setTitle("Hours") .setItems(items, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialoginterface, int i) { // getStation(i); } }) .show(); } I get an error in cannot be resolved to a variable processing the line .setItems(items,: items cannot be resolved I think that the compiler thinks that the CharSequence[] items may not be initialised or something... How can I make this programme run? java android share|improve this question asked Apr 6 '10 at 14:37 Devel 36061126 1 Hint: when the compiler thinks it is not initialized, then he will tell you that it's not initialized. If it says "cannot be resolved", then it means that it can't find the variable in any applicable scope. –Joachim Sauer Apr 6 '10 at 14:41 add a comment| 6 Answers 6 active oldest votes up vote 3 down vote accepted The problem is variable scoping. if (someCondition) { final int i = 666; } else { final int i = 42; } int j = i + 1; // compile-time error Here we have two local variables i who goes out of scope immediately after they're declared and initialized. If j needs the value of i, then i would have to be declared in a larger scope. final int i; if (someCondition) { i = 666; } else { i = 42; } int j = i + 1; // compiles fine! (It should be mentioned that this is exactly the kind of scenarios where the ternary operator excels, i.e.) final int i = (someCondition) ? 666 : 42; In your specific case, unfortunately the array
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Cannot Be Resolved To A Variable Error In Jsp
more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question java array cannot be resolved to a variable 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: Sign up Eclipse http://stackoverflow.com/questions/2585650/variable-cannot-be-resolved error … cannot be resolved to a type up vote 20 down vote favorite 2 I have a dynamic web project that I am working on to migrate a jsp/servlet app from JRun to Tomcat. I am getting the error: com.ibm.ivj.eab.dab.DatastoreJDBC cannot be resolved to a type. I have the *.class files sitting inside a com/ibm/ivj/eab/dab folder (exactly how I found them). I http://stackoverflow.com/questions/15794821/eclipse-error-cannot-be-resolved-to-a-type have tried creating a jar file and adding that to the build path via "Add External Jar", I have also tried adding an "External Class Folder" and pointing to the folder that contains the "com" directory in question. Still, the error persists. What is strange is if I start typing the package name eclipse actually auto-completes the class for me! (pictured below). Any ideas would be greatly appreciated. Maybe the classes were compiled for a much older java version and that is causing trouble? Maybe there is something I need to do to ensure the classes end up in the WEB-INF/lib directory? I java eclipse share|improve this question asked Apr 3 '13 at 18:10 mikey 3,60011222 Is there an import statement in your code for the class? –Chris Gerken Apr 3 '13 at 18:22 @ChrisGerken no I did just add <%@page import="com.ibm.ivj.eab.dab.*"%> to the top (this is a JSP page) and also <%@page import="com.ibm.ivj.eab.dab.DatastoreJDBC"%> what is interesting is Eclipse doesn't mind the first import but marks the second as an error. –mikey Apr 3 '13 at 18:27 add a comment| 4 Answers 4 active o
error and eclipse is telling me my finalAmount variable can't be resolved. From looking at it I know it's outside of the scoop of the for statement and everytime I create a local variable and assign a value https://teamtreehouse.com/community/java-cannot-be-resolved-to-a-variable to it (it's zero) my program gets messed up. My question is, how would I declare the finalAmount variable locally? Thanks import java.util.Scanner; public class CompoundInterest { public static void main(String[] args){ double rate; double amount; double year; http://philip.yurchuk.com/software/eclipse-cannot-be-resolved-to-a-type-error/ System.out.println("This program, with user input, computes interest.\n" + "It allows for multiple computations.\n" + "User will input initial cost, interest rate and number of years."); Scanner input = new Scanner(System.in); System.out.println("What is the inital cost?"); amount = input.nextDouble(); System.out.println("What cannot be is the interest rate?"); rate = input.nextDouble(); rate = rate/100; System.out.println("How many years?"); year = input.nextDouble(); for(int x = 1; x < year; x++){ double finalAmount = amount * Math.pow(1.0 + rate, year); // the below works but the problem is, it prints the statement out many times. I don't want that. /* System.out.println("For " + year + " years an initial " + amount + " cost compounded at a rate of " + rate + cannot be resolved " will grow to " + finalAmount); */ } System.out.println("For " + year + " years an initial " + amount + " cost compounded at a rate of " + rate + " will grow to " + finalAmount); } } 1 Answer omars 9,006 Points omars omars 9,006 Points almost 3 years ago Shane, Q: "eclipse is telling me my finalAmount variable can't be resolved" A: This is because you are declaring 'finalAmount' within the for loop. Once your for loop exits, 'finalAmount' goes out of scope. Meaning, Java has no clue it ever existed. Q: "My question is, how would I declare the finalAmount variable locally?" A: From what I know, you cannot declare a variable within a loop of any kind if you want to retain the previous value. When you declare a variable within a loop this is what happens: Your loop begins with an initial value of 0. (This is before the calculation takes place, double finalAmount;) A value is calculated and assigned to finalAmount. Your loop ends. If you loop condition is still valid (x < year), repeat from step one (finalAmount is redeclared and initialized). Someone please correct me if I said anything wrong about the above steps. Here is my suggested change to your code, I hope this helps. import java.util.Scanner; public class CompoundInterest { public static void main(String[] args)
resolve classes. Classes that are in the same package as the class I'm editing. Classes that are fully qualified in the import statement. Not good. The last thing I had done was add a Spring @Autowired annotation. I saved the file and voila, everything goes to crap. I then spend a stupid amount of time trying to track down the cause. I took the changes out. I did a clean and rebuild and retest (everything passed; this was Eclipse-only). I added new classes to see if they broke (they did). I did a false modify (add space, remove space, save) to see if that broke said file (it did). It was a death spiral. No matter how I changed the code, the same problem was there. Turns out, it wasn't the annotation, or anything else in Spring, or any of my code, or any of my Eclipse plugins. It was a step before that killed me. I was doing a little cleanup and I created a temp directory at the top of my project folder so I could move some files there. It wasn't nested in anything, other than the top level directory. What could go wrong? Apparently, that makes Eclipse see red. Squiggly red. The solution was simply to do a refresh (F5) on my project. Just as quickly as it started, the problem went away. That smells like a bug to me, but if it was I figure I'd see a lot more mentions in Google or the Eclipse bug tracker. I'm really hoping this helps someone save some time. Update: If that doesn't work, try: Clean, refresh, build, restart Also, remember any external build/clean scripts you might be using. For instance, Grails has a command line "clean" you may have to invoke. Same if you have Ant or Maven builds. David Resnick (comment below) discovered this tip for those with an external build script: Windows–>Preferences–>Java–>Compiler–>Building–>Output folder–>”Rebuild class files modified by others”. This exists in Eclipse 3.5; I’m not sure about earlier versions. Another issue I've found over the years is problems when upgrading Eclipse. In theory, new versions of Eclipse should update your workspace and project files just fine. In practice, they can become corrupted. My new rule is to create a new workspace for every major version upgrade of Eclipse (maybe more often if you're cautious). Then I copy those projects and import the copy. This ensures I have a backup plan should something go