The Java standard library refers to the set of dynamically loadable libraries that Java applications can call at run time. This is because the Java platform is not dependent on the specific operating system.
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Apache Harmony is the recent open source implementation of the Java runtime with class libraries and associated tools.
There are several types of Java technology. Some examples of Java software are Java ME, Java EE, Java SE, and Java Card. Java made the JAVA development kit for those that develop in Java. There is also Java Virtual machine and some class libraries. Java is also famous for its languages like Clojure, Beanshell, Groovy, Gosu, Rhino, Kotlin, JRuby, Scala, and Jython.
Java source files have the .java extension, compiled Java class files have the .class extension.
Java Native Interface JNI is an interface between java and applications and libraries written in other languages. As an example, JNI enables Java programs to use C libraries and also enables C programs to use Java classes.
The actions in a java class are called methods.