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Illustration: import org. Menu What does this import mean? It makes the Menu class available in the package org. Such that when we call the below command as follows:. Skip to content. Change Language. Static member of a class can be called directly without creating object instance. Since the main method is static Java virtual Machine can call it without creating any instance of a class which contains the main method, which is start point of program.
For linux users, and to sum up and add to what others have said here, you should know the following:. Using -cp requires that you keep track of all the directories manually and copy-paste that line every time you run the program not preferable IMO. The colon ":" character separates the different directories. For example:. With that, whenever you run java it will look in the current working directory the one you're in for classes. Now, java will look for the driver AND for your classes. How are we doing?
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Learn more. What is a classpath and how do I set it? Ask Question. Asked 11 years, 8 months ago. Active 10 days ago. Viewed k times. I was just reading this line: The first thing the format method does is load a Velocity template from the classpath named output.
Stephen C k 90 90 gold badges silver badges bronze badges. Blankman Blankman k gold badges silver badges bronze badges. Add a comment. Active Oldest Votes. When programming in Java, you make other classes available to the class you are writing by putting something like this at the top of your source file: import org.
MyClass; Or sometimes you 'bulk import' stuff by saying: import org. So, classpaths contain: JAR files, and Paths to the top of package hierarchies. How do you set your classpath? The -classpath option is preferred because you can set it individually for each application without affecting other applications and without other applications modifying its value.
A command-line tool, such as java , javac , javadoc , or apt. Class paths to the JAR, zip or class files. Each class path should end with a file name or directory depending on what you are setting the class path to, as follows:.
For class files in an unnamed package, the class path ends with the directory that contains the class files. For class files in a named package, the class path ends with the directory that contains the root package, which is the first package in the full package name.
The default class path is the current directory. Setting the CLASSPATH variable or using the -classpath command-line option overrides that default, so if you want to include the current directory in the search path, then you must include a dot.
Class path entries that are neither directories nor archives. The class path tells the JDK tools and applications where to find third-party and user-defined classes that are not extensions or part of the Java platform.
The class path needs to find any classes you have compiled with the javac compiler. The default is the current directory to conveniently enable those classes to be found. Class libraries for most applications use the extensions mechanism. You only need to set the class path when you want to load a class that is a not in the current directory or in any of its subdirectories, and b not in a location specified by the extensions mechanism.
You should remove any settings that are not application-specific, such as classes. Such settings can remain.
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