feresyn.blogg.se - Compile java jar file

after -d option we provide the location of the directory in which class files should be stored. But it’s a good practice to keep source and class files separately. If we don’t use this option then the class file will be created in the src directory. d option: It is used to store the output to different directory.

Step 2 (Compile utility class): Open terminal at proj1 location and execute following commands.Ĭp_tutorial/proj1/src>javac -d.

Here, We have one utility class that is A. classes files that are files generated after compiling the project.įollowing are the steps to run java class file which is in different directory: java files that are source files and in classes directory, we will keep. Here you have 2 projects proj1 and proj2. Create a directory structure as shown in the figure below. Let’s proceed with the following example. In that case, you can use -cp command while compiling and executing your program. Then in this situation import keyword doesn’t work because your first project is at another classpath. Now suppose you already have a project in which you have used some utility classes, which you need in your second project also. Import keyword can import classes from the current classpath, outside the classpath import can’t be used. Suppose you have directory structure as follows:Īnd your classpath starts from c, then your class should be in package d not in a.b.c.d. It is to be remembered that packaging of a class starts from classpath. You can import classes from different packages but from same classpath. Import keyword is used in Java to import classes from current project’s classpath.

extension classes: packages that are in the extension directory of the JRE or JDK, jre/lib/ext/ user-defined packages and libraries.

bootstrap classes: the classes that are fundamental to the Java Platform (comprising the public classes of the Java Class Library, and the private classes that are necessary for this library to be functional).The JVM searches for and loads classes in this order: JVM always go into the deep of classpath to search for a class or resource. By default JVM always access the classpath classes while executing a program. Variables and methods which are accessible and available at classpath are known as classpath variables. The classpath tells Java where to look in the filesystem for files defining these classes. Similar to the classic dynamic loading behavior, when executing Java programs, the Java Virtual Machine finds and loads classes lazily (it loads the bytecode of a class only when the class is first used). Ĭlasspath is the location from where JVM starts execution of a program.

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