I have been trying to figure out what is going wrong with this program I’m writing. Heres the full description of what I’m trying to do: Use the Account class created in Programming Exer- cise 9.7 to …
Why throws, on a method, is part of its signature? It seems strange to include it. Here is an example where it is in the way: If anyone were to see this method from the outside, they might try to use it without knowing that it is not supported. They would only learn it on trying to run the code.
I get this null pointer exception error if i call a method. if (farm1.cropStat(row, col) ) here’s the method here’s the initialization pls help 🙁 Answer Whenever you see a pattern that looks like this replace it with the equivalent It is the same thing. As far as the error goes, you need to reverse the order of your checks
Is there any way to write a program in java, so that its main method schedule (or at a 10-15 min interval) another method to executes it at a particular interval? Answer I think you are looking for the Time class. See Timer Class API You can use this class like: You want to perform a Method every 600 miliseconds.
This is my second programming class and I am new to Java. I have been working on my first assignment and it involves classes and methods. I know very little about these topics and find myself lost. My assignment asks me to create a RPN calculator that asks the user for two numbers and an operator. The calculator performs the
I’ve tried to find a laymans definition of addNotify() but I can’t really get any answer using Google. As far as I know, when overriding addNotify() in my class, I should call super.addNotify(); and then do whatever else afterward. My question is, does addNotify() run automatically? What is it’s purpose and what happens when I override it and furthermore, why
where Foo is my own class. What is the return type of this method? Why does it seem to have two return types? Answer No, you don’t have two return types. It’s a generic method you are seeing. <E extends Foo> → You are declaring a generic type for your method; List<E> → This is your return type. Your method
What does .class mean in Java? For example, if I created a class called Print. What does Print.class return? Answer When you write .class after a class name, it references the class literal – java.lang.Class object that represents information about a given class. For example, if your class is Print, then Print.class is an object that represents the class Print
Im getting this error: HTTP Status 405 – Request method ‘POST’ not supported What I am trying to do is make a form with a drop down box that get populated based on the other value selected in another drop down box. For example when I select a name in the customerName box the onChange function in the .jsp page
Do you think it is possible to create something similar to this? Answer Yes, you can. Usage example: