It redefines “equality” of objects. By default (defined in java.lang.Object), an object is equal to another object only if it is the same instance. But you can provide custom equality logic when you override it. For example, java.lang.String defines equality by comparing the internal character array. That’s why: Even though you may not need to … Read more
If all of your classes are in the same package, you shouldn’t need to import them. Simply instantiate the object like so: CustomObject myObject = new CustomObject();
The java and javac executables are using the PATH environment variable, while intelliJ is using JAVA_HOME variable. Remove the additional quotation marks in your JAVA_HOME value. It might shows that your path to the jdk installation directory is hard coded in the PATH, rather then using %JAVA_HOME%.
Is CompanyDao being compiled and available on the classpath before CarPeer?
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
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
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
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
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
Some test results I’ve gotten a lot of good answers to this question–thanks folks–so I decided to run some tests and figure out which method is actually fastest. The five methods I tested are these: the “ContainsKey” method that I presented in the question the “TestForNull” method suggested by Aleksandar Dimitrov the “AtomicLong” method suggested … Read more