This includes deployment technologies like Java Web Start and the Java Plug-in , as well as internal components like the ClassLoader and Bytecode Verifier. How the JRE Works
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The JRE provides the environment—the "stage"—necessary for the Java application to perform. Without it, the code is just a text file that can’t do anything.
A set of standard, pre-written code collections (APIs) that provide common functions, such as networking, file input/output (I/O), and data structures.