- Compiling java in terminal subclass full#
- Compiling java in terminal subclass code#
- Compiling java in terminal subclass windows#
Compiling java in terminal subclass windows#
Open up your Command-Line or Terminal, Depending on what Operating System you’re using.įor Windows: Press Windows key + R, Then type in “cmd” (without the quotes) and press enter. but in this case, where we have multiple related classes, it would be nice to compile all the programs once. Note: Usually, when dealing with just a single Java file/class, we would run both commands for just that class. There are two major steps to successfully running a Java Program:įor the compilation, we use the javac command Because we are not using Netbean or IntelliJ, we will be compiling and running our program manually. Okay, this is the part where we run our program.
Compiling java in terminal subclass code#
Note: I’ll be using Visual Studio Code for this lesson, “why?” As much as it’d be great and nice to have an IDE like Netbean or IntelliJ abstract all the details of compilation from you, one problem is, you may not entirely understand the process and adequately debug issues when the need arises. Note : You should have only one class per package fileįirst We’ll have our package folder structure like so:Ĭreate a package folder called calculator with these classes We’ll be using Modularization by default as we would be separating each of the class files and putting them in a single folder ( package ). Let’s run through a very basic example: we’ll build a Calculator class ( parent class ) with class methods and attributes, then extend a M圜alculator subclass (child class) from it, that will inherit the methods and attributes from it. User-Defined Packages ( Packages you create ).Built-in packages ( Packages from the Java API ).Packages come in handy when building a more maintainable code and are mostly of two types: A Package is basically a folder of related classes. PackagesĪ package in Java is used to group related classes. The major advantage of modularizing our programs is that it helps us detect and debug issues faster and more efficiently. Hopefully the emoji above is a good enough illustration. Modularization involves the process of breaking a program into components or sub-programs. To declare a child class of a parent class in Java, you use the keyword extends. But for notes, we have a number of types of inheritance: We won’t go too deep into the details around inheritance, we’ll just see a practical example in Java. This is where Inheritance comes in handy, inheritance allows one class ( subclass/child ) to “inherit” the attributes and methods from another class ( super-class/parent ).
The -Xlint option allows us to enable warnings during compilation.It’s nice to have a bunch of objects and their collective methods and attributes, but what would be nicer would be for us to share these methods and attributes across other related objects, and why would we want to do this? Well, mostly for re-usability and maintaining the DRY (Do not Repeat Yourself) principle.
Compiling java in terminal subclass full#
For a full description of the other javac extra options, follow this link. However, there is an option that's very useful and worth mentioning, -Xlint. As such, we won't go over these options in detail. We can compile the Data type like before with detail messages printed on the console by executing this command: javac than keeping arguments in separate files, we can also store them all in a single file.Įxtra options of javac are non-standard options, which are specific to the current compiler implementation and may be changed in the future.
The types file: com/baeldung/javac/Data.java Let's assume we have two files, named options, and types, in the javac-args directory with the following content: Spaces and newline characters can be used to separate arguments included in such an argument file. When the javac command encounters an argument starting with ‘, it interprets the following characters as the path to a file and expands the file's content into an argument list.
The names of those files, prefixed with the ‘ character, are then used as command arguments. Instead of passing arguments directly to the javac tool, we can store them in argument files. The last standard option we'll cover is the argument file. which classes are loaded and which are compiled, we can apply the -verbose option. If we want to know what's going on during a compilation process, e.g. This option is only applicable to Java 9 and above – please refer to this tutorial for a guide to the Java 9 module system. -p (or –module-path) – indicates the location of necessary application modules.If this option is missing and the CLASSPATH environment variable isn't set, the current working directory is used instead (as was the case in the example above). -cp (or -classpath, –class-path) – specifies where types required to compile our source files can be found.