- ldc
*integer-constant*
This instruction will push a constant integer value onto the stack. - imul This instruction will multiply the top two integer values on the stack, replacing the two integers with the result of the multiplication operation.
- iadd This instruction will add the top two integer values on the stack, replacing the two integers with the result of the addition operation.
- isub

Take the following arithmetic expression:

7 + 8 * 9 - 24

This expression will be compiled down to the following Java bytecode:

ldc 24

ldc 7

ldc 8

ldc 9

imul

iadd

isub

As you can see, the JVM places information and data onto the stack and performs stack operations on the information. Obviously, this is not a complete coverage of bytecode operations and the JVM, but I hope this helps provide a basic understanding of what Java bytecode looks like, while also showing how it works. In future tutorials, I'll provide more complicated examples. In the meantime, if you're interested in more information about the JVM and some of the optimizations it performs, read my blog post on JVM optimizations.

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