I think your problem is that you are not using good OO design for your player and enemies. Create two classes: Your Player should have X,Y,Width,and Height variables. Your enemies should as well. In your game loop, do something like this (C#): To speed things up, don’t bother checking if the enemies coords are offscreen.
It’s a new feature in Java 8 which allows an interface to provide an implementation. Described in Java 8 JLS-13.5.6. Interface Method Declarations which reads (in part) Adding a default method, or changing a method from abstract to default, does not break compatibility with pre-existing binaries, but may cause an IncompatibleClassChangeError if a pre-existing binary attempts to invoke the method. This error occurs if the qualifying … Read more
From wikipedia In Java, all non-static methods are by default “virtual functions.” Only methods marked with the keyword final, which cannot be overridden, along with private methods, which are not inherited, are non-virtual.
A class can’t be both final and abstract. You can prevent instantiation by hiding the constructor, and raising an exception to prevent instantiation via reflection. That looks like this:
Java 7 defaults to TLS 1.0, which can cause this error when that protocol is not accepted. I ran into this problem with a Tomcat application and a server that would not accept TLS 1.0 connections any longer. I added to the Java options and that fixed it. (Tomcat was running Java 7.)
First declare your method to accept a parameter: Then pass it: Using an instance variable is not a good choice, because it would require calling some code to set up the value before take() is called, and take() have no control over that, which could lead to bugs. Also it wouldn’t be threadsafe.
A break with a label is not the same as a goto statement. Java does not have a goto statement. A label marks the statement that follows it. You can use it to break out of that statement, and only out of that statement. Control of flow will always transfer to the end of the labeled statement. So what do you … Read more
Use findElements instead of findElement. findElements will return an empty list if no matching elements are found instead of an exception. To check that an element is present, you could try this This will return true if at least one element is found and false if it does not exist. The official documentation recommends this method: findElement should not be … Read more
Retrieve the content pane for the frame and use the setBackground() method inherited from Component to change the color. Example: