If you choose to use the Commons Collections library instead of the standard Java Collections framework, you can achieve this with ease. The BidiMap interface in the Collections library is a bi-directional map, allowing you to map a key to a value (like normal maps), and also to map a value to a key, thus allowing you to perform … Read more
An int is not null, it may be 0 if not initialized. If you want an integer to be able to be null, you need to use Integer instead of int. Besides the statement if(person.equals(null)) can’t be true, because if person is null, then a NullPointerException will be thrown. So the correct expression is if (person == null)
jd-gui is the best decompiler at the moment. it can handle newer features in Java, as compared to the getting-dusty JAD.
Oracle has a poor record for making it easy to install and configure Java, but using Homebrew, the latest OpenJDK (Java 14) can be installed with: For the many use cases depending on an older version (commonly Java 8), the AdoptOpenJDK project makes it possible with an extra step. Existing users of Homebrew may encounter Error: Cask adoptopenjdk8 exists … Read more
While you are pretty close to a solution, there are a few critical problems in your code: Your call to substring() fetches a string of size 2. That string can never be cat nor dog. Change the second parameter in the method call to i + 3 to get 3 characters. Your call to substring() will throw an IndexOutOfRangeException, as i approaches the end of the length of the input string. Make … Read more
Technically, Breadth-first search (BFS) by itself does not let you find the shortest path, simply because BFS is not looking for a shortest path: BFS describes a strategy for searching a graph, but it does not say that you must search for anything in particular. Dijkstra’s algorithm adapts BFS to let you find single-source shortest paths. … Read more
One of your files is corrupted. Simply download Jarfix and run it. The Breakdown has an easy and helpful website to using Jarfix. Simply follow the instructions and download it in the link below:
This might help: 1) “Build” menu -> “Rebuild Project“. Sometimes Intellij doesn’t rewrite the classes because they already exist, this way you ask Intellij to rewrite everything. 2) “Run” menu -> “Edit configuration” -> delete the profile -> add back the profile (“Application” if it’s a Java application), choose your main class from the “Main … Read more
Not all view are listed directly in every perspective … choose:
1- JSmooth .exe wrapper:JSmooth is a Java Executable Wrapper. It creates native Windows launchers (standard .exe) for your java applications. It makes java deployment much smoother and user-friendly, as it is able to find any installed Java VM by itself. When no VM is available, the wrapper can automatically download and install a suitable JVM, … Read more