Also released J2EE (Java 2 Enterprise Edition) and J2ME (Java 2 Micro Edition). Reference: 'Java Version History' JDK Alpha and Beta (1995): Sun Microsystem announced Java in September 23, 1995.
Since you are supposed to write Java Programs, you should install JDK, which includes JRE. JDK (Java Development Kit), which includes JRE plus the development tools (such as compiler and debugger), is needed for writing as well as running Java programs. JRE (Java Runtime) is needed for running Java programs. The JDK is freely available from Sun Microsystems (now part of Oracle). The Java Development Kit (JDK), officially named 'Java Platform Standard Edition' or ' Java SE', is needed for writing Java programs.
