You can tell jGrasp to compile your code by selecting Build -> Compile, as shown in the image below. Internally, jGrasp performs this by running javac, though it hides this detail from you. Once your code is written, you can try to compile it. Once you have selected a place to save the file along with the filename, hit the Save button. ![]() While you can save your code with a different filename, you won't actually be able to compile and run your code later.Īssuming your code contains a class definition (e.g., public class Foo), jGrasp will automatically choose a correct filename (in this case, Foo.java). In Java, the filename must always match the name of the class you have created in the file.įor example, if the class name is Foo, then the code must be saved in a file named Foo.java. Selecting Save will allow you to choose exactly where you want to save the file, along with what the filename should be. You can save the file by selecting File -> Save from the menu, as shown in the image below. You will need to save the file explicitly before you can actually compile or run your code. While you have been working with a file in jGrasp, it has not yet been saved to the computer. When you ask jGrasp to create a new file, an embedded window will appear wherein you can write and edit your code. You can create a new Java source file by selecting File -> New -> Java. JGrasp can be downloaded here (look for the “Download” link on the top left you can skip the survey and scroll straight to the bottom).Įxactly how you do this depends on your particular configuration. This guide assumes that you already have jGrasp installed, which is preinstalled on the lab machines. Run this program like this: java ZipDir For example, compress a sub directory in the current directory: java ZipDir JavaTutorialsThis compresses the whole directory JavaTutorials into the JavaTutorials.zip file.Compiling and Running Java Code with jGrasp Compiling and Running Java Code with jGrasp Private static void zipFile(String filePath) Note that the directory path is given from the command line. * This Java program demonstrates how to compress a file in ZIP format. Compress a Single File ExampleThe following program compresses a file whose path is passed from the command line: import java.io.* setLevel(int level): sets the compression level ranging from 0 to 9 (the default). ![]() setMethod(int method): there are 2 methods: DEFLATED (the default) which compresses the data and STORED which doesn’t compress the data (archive only).You can also set the compression method and compression level using the following ZipOutputStream’s methods: Write all bytes read to the output stream using the write(byte bytes, int offset, int length) method.Read all bytes from the original file by using the Files.readAllBytes(Path) method.The ZipEntry class represents an entry of a compressed file in the ZIP file. Put a ZipEntry object by calling the putNextEntry(ZipEntry) method on the ZipOutputStream. ![]() The ZipOutputStream class implements an output stream filter for writing in the ZIP file format.
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