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In the Java Virtual Machine (JVM), IntelliJ IDEA is an Integrated Development Environment (IDE) used for developing and debugging Java programs. IDEA itself does not handle the functionalities of the JVM, but rather utilizes the JVM to run and debug Java programs.

When we run Java programs in Idea, Idea compiles the program into bytecode and then the JVM converts the bytecode into machine code to execute it. The JVM is responsible for loading the bytecode files and interpreting and executing them.

In the JVM, bytecode is loaded into memory, and the JVM executes the instructions in the bytecode file. The JVM is responsible for managing memory, garbage collection, thread scheduling, and providing some basic runtime libraries.

During debugging of Java programs, Idea provides debugging functionality by interacting with the JVM. Idea can establish a debugging connection with the JVM and communicate with the running Java program through this connection. In this way, Idea can inspect the program’s status at runtime, set breakpoints, and perform step-by-step execution.

In conclusion, IntelliJ IDEA does not directly handle the functionality of the JVM itself, but rather uses the JVM to run and debug Java programs. The JVM is responsible for loading and executing the bytecode of Java programs, and providing a runtime environment and debugging interface for IntelliJ IDEA to utilize.