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Tag: variables
java variable scope, variable might not have been initialized
I am studying java, I know Java variable scope, such as class level, method level, block level. However, when I try to practice the variable scope, I meet the error in my code. my code is as following: when I run this code, it display the error: the c variable might not have been initialized, but when I change my
Why would you declare a variable of type X within the interface X in Java?
I ran into the following code recently: It is confusing to me what the purpose of this could be. Can someone explain why someone would write this code? Answer Every field in an interface is implicitly static, so this isn’t defining something that lives in every Filter — it’s defining one common Filter that is stored in the Filter interface’s
How to declare a numerical variable in java that is to hold a digit value with a fixed length of 3 digits always.
How to declare a numerical variable in Java that is to hold a digit value with a fixed length of 3 digits always. That is if i input 0, it should be formated to 000, if i input 31 then it should be formated to 032 and if i input 100 then it should remain 100. I need this for
How do I create a reference to my object using a variable?
So I have an array full of nodes called “SNodes” (they are a class of my own creation. They are literally just a basic node that holds a single String and a pointer to the next node). I have …
How to convert an String Variable with Array to an Integer Variable with Array
I am new to java programming. I am trying to convert an string variable with array to an int variable array but i have 2 errors and have no idea to fix it, any help would be great, thanks.. This is my source code : This is what the errors look like Answer Try below code, it is working.
How to Count Number of Instances of a Class
Can anyone tell me how to count the number of instances of a class? Here’s my code The class variable is to be used to keep count of the number of instances of the Bicycle class created and the tester class creates a number of instances of the Bicycle class and demonstrates the workings of the Bicycle class and the
Setting all values in a boolean array to true
Is there a method in Java for setting all values in a boolean array to true? Obviously I could do this with a for loop, but if I have (for example) a large 3D array, I imagine using a loop would be quite inefficient. Is there any method in Java to set all values in a certain array to true,
How to initialize and draw a Rectangle variable in a paintComponent method? [closed]
I’ve been trying to add collision to my game, it seemed like a piece of cake, I already know how to draw a rectangle. But I need that rectangle to be represented by something, a variable. But it seems …
How to create change listener for variable?
Let’s say I have some variable defined using the statementint someVariable;. While the code runs, the variable’s value changes. How can I track the changes in this variable? How could I implement some Listener that behaves like onSomeVariableChangedListener? I also need to know when some other method in one page has been executed so I can set a Listener in