What is causing this Java “Cannot find symbol” error?
Is CompanyDao being compiled and available on the classpath before CarPeer?
Java
How do I print out the value of this boolean? (Java)
should work just fine. Incidentally, in the year % 400 part will never be reached because if (year % 4 == 0) && (year % 100 == 0) && (year % 400 == 0) is true, then (year % 4 == 0) && (year % 100 == 0) must have succeeded. Maybe swap those two … Read more
Java Enum return Int
Font.PLAIN is not an enum. It is just an int. If you need to take the value out of an enum, you can’t avoid calling a method or using a .value, because enums are actually objects of its own type, not primitives. If you truly only need an int, and you are already to accept … Read more
Printing the stack values in Java
In Java, I want to print the contents of a Stack. The toString() method prints them encased in square brackets delimited by commas: [foo, bar, baz]. How do I get rid of them and print the variables only? My code so far: This answer worked for me: Use the toString method on the Stack, and … Read more
Cannot make a static reference to the non-static method fxn(int) from the type Two
Since the main method is static and the fxn() method is not, you can’t call the method without first creating a Two object. So either you change the method to: or change the code in main to: Read more on static here in the Java Tutorials
WebServlet cannot be resolved to a type
Try adding servlet-api.jar instead of servelt-api-3.0 jar.Stop the server. Refresh the project and then start the server and see. I think it should work. Make sure you are adding the servlet-api.jar from tomcat lib folder. Suppose your tomcat is in C:\Tomcat\lib. In eclipse right click your project-properties-javabuildpath-add external jars and then select the servlet-api.jar from … Read more
Java: How to access methods from another class
You need to somehow give class Alpha a reference to cBeta. There are three ways of doing this. 1) Give Alphas a Beta in the constructor. In class Alpha write: and call cAlpha = new Alpha(cBeta) from main() 2) give Alphas a mutator that gives them a beta. In class Alpha write: and call cAlpha … Read more
java.lang.IllegalMonitorStateException: object not locked by thread before wait()?
This is wrong: The problem is, what’s going to wake this thread up? That is to say, how do you guarantee that the other thread won’t call foo.notify() before the first thread calls foo.wait()? That’s important because the foo object will not remember that it was notified if the notify call happens first. If there’s … Read more
java.sql.SQLException: No database selected – why?
Firstly, I am considering my answer to show you another better way for connection with MySQL Database, it’s much easier and less nu-expected Exception(s).You need to do some steps: Download Connector/J and add it to your class path(if you are using an IDE there is add the .jar to the library, or there is many … Read more
How to fix the compiler error in this program?
So i’m a student in high school new to the Java language and i’m using this program called jgrasp, which we use to program java. I just got the program for home to try to finish off a lab I was working on and when I compile, this shows up: I just recently upgraded my … Read more