Trying to guess your problem: When you press the Run as button (White arrow in green circle), Eclipse doesn’t run the program you’re editing. Instead, it runs again the last program you executed. That’s the reason why you see the output of another project: You’re telling Eclipse to repeat its execution. So, to run your new app, … Read more
Ruby has Interfaces just like any other language. Note that you have to be careful not to conflate the concept of the Interface, which is an abstract specification of the responsibilities, guarantees and protocols of a unit with the concept of the interface which is a keyword in the Java, C# and VB.NET programming languages. In Ruby, we use the … Read more
The inverse is XOR! If you have: You can get a or b back if you have the other value available: For example if a = 5, b = 3 (and thus c = 6 as you mentioned) you get:
You are calling str.substring(i, j-i) which means substring(beginIndex, endIndex), not substring(beginIndex, lengthOfNewString). One of assumption of this method is that endIndex is greater or equal beginIndex, if not length of new index will be negative and its value will be thrown in StringIndexOutOfBoundsException. Maybe you should change your method do something like str.substring(i, j)? Also if size is length of your str then should probably be
Select the project, then File > ProjectStructure > ProjectSettings > Modules -> sources You probably have the Language Level set at 9: Just change it to 8 (or whatever you need) and you’re set to go. Also, check the same Language Level settings mentioned above, under Project Settings > Project
You need to add junit library to the classpath of your project. There are several choices to achieve it depending on your development setup. Command line: In the case of command line invocations, you will have to add junit.jar to the classpath of your application with java -cp /path/to/junit.jar. Take a look at the answers here. Using eclipse: Eclipse distributions are … Read more
Update: To answer the performance-question raised here, I made a measurement. First thing: 20.000 lines are too few, to get the program running for a noticeable time. I created a text-file with 5 million lines. This solution (started with java without parameters like -server or -XX-options) needed around 11 seconds on my box. The same with wc … Read more
There is no built-in method, but there are several ways to do it. The most straightforward way that I can think of at the moment is: Create a subclass of JComponent. Override the paintComponent(Graphics g) method to paint the image that you want to display. Set the content pane of the JFrame to be this subclass. Some sample code: Note that … Read more
Minecraft 1.7.6 or newer (UUID) On Minecraft 1.7.6 and above, Mojang uses a new UUID format. Use a UUID lookup tool, like http://minecraft-techworld.com/uuid-lookup-tool to determine the UUID of the player you wish to reset. Make sure that the player you wish to reset is logged out of the server. Use FileZilla to connect to the server FTP. … Read more
An attribute is another term for a field. It’s typically a public constant or a public variable that can be accessed directly. In this particular case, the array in Java is actually an object and you are accessing the public constant value that represents the length of the array.