Planned lessonMID-001-L01

From .class file to running code

On This Lesson 4 topics

This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.

In this lesson

trace a Java source file through compilation to execution.

javac turns .java into .class files holding bytecode, a portable instruction set.
The JVM loads classes on demand, verifies them, then runs the bytecode.
Bytecode is not machine code; the JVM interprets it, then compiles hot parts to machine code.
"Write once, run anywhere" works because the JVM, not your code, is platform-specific.

Draft outline details

text

Shop.java --javac--> Shop.class --JVM: load, link, init--> interpret / JIT --> CPU

What does javac produce?

Show answer

Bytecode in .class files, not machine code.

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