JDK Download Free (Java Development Kit)– free set of tools for developing applications using JAVA language.
JDK Download Free Version Description
JDK by Oracle is set of tools for developing applications using JAVA language. Here you can find various libraries and Java Runtime Environment (JRE) – virtual engine that enables JAVA applications on any device with any OS. So JRE makes JAVA applications to be cross-platformed.
Unfortunately JDK does not contain IDE. Developer who uses JDK also needs to use a third party code editor. It can be a standard text editor or a full IDE. There are some development environments that have already built-in function for working with JAVA. Using such programs you do not need to compile program using a command string. So you definitely should think about purchasing or downloading integrated development environment.
For studying JAVA you can find all sourcecodes and data including JAVA compiler sourcecode in JDK.
Version: Java Development Kit (JDK) 6u151, 7u141, 8u131
Developer: Oracle Corporation