what is the filename extension used for all java source files
.java
title: Java class file text: Java class file A Java class file is a file (with the .class filename extension) containing Java bytecode that can be executed on the Java Virtual Machine (JVM). A Java class file is usually produced by a Java compiler from Java programming language source files (.java files) containing Java classes (alternatively, other JVM languages can also be used to create class files). If a source file has more than one class, each class is compiled into a separate class file. JVMs are available for many platforms, and a class file compiled on one platform will execute on a JVM of title: Java (programming language) text: developers to access documentation within the IDE. The traditional "Hello, world!" program can be written in Java as: Source files must be named after the public class they contain, appending the suffix codice_6, for example, codice_7. It must first be compiled into bytecode, using a Java compiler, producing a file named codice_8. Only then can it be executed, or "launched". The Java source file may only contain one public class, but it can contain multiple classes with other than public access modifier and any number of public inner classes. When the source file contains multiple classes, make one class "public" title: JAR (file format) text: write Zip and JAR archives, including support for Unix filesystem extensions. The org.apache.tools.zip package is released under the Apache Software Foundation license and is designed to be usable outside Ant. Several related file formats build on the JAR format: JAR (file format) A JAR (Java ARchive) is a package file format typically used to aggregate many Java class files and associated metadata and resources (text, images, etc.) into one file for distribution. JAR files are archive files that include a Java-specific manifest file. They are built on the ZIP format and typically have a codice_1 file extension. A JAR file title: JAR (file format) text: JAR (file format) A JAR (Java ARchive) is a package file format typically used to aggregate many Java class files and associated metadata and resources (text, images, etc.) into one file for distribution. JAR files are archive files that include a Java-specific manifest file. They are built on the ZIP format and typically have a codice_1 file extension. A JAR file allows Java runtimes to efficiently deploy an entire application, including its classes and their associated resources, in a single request. JAR file elements may be compressed, shortening download times. A JAR file may contain a manifest file, that is title: Java (programming language) text: which is intended for software developers and includes development tools such as the Java compiler, Javadoc, Jar, and a debugger. OpenJDK is another notable Java SE implementation that is licensed under the GNU GPL. The implementation started when Sun began releasing the Java source code under the GPL. As of Java SE 7, OpenJDK is the official Java reference implementation. The goal of Java is to make all implementations of Java compatible. Historically, Sun's trademark license for usage of the Java brand insists that all implementations be "compatible". This resulted in a legal dispute with Microsoft after Sun claimed that