How does idea use the jclasslib plug-in to view bytecodes
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Install the jclasslib plug-in
Directly search the idea plug-in list for the jclasslib plug-in and install:
Use
We write a code to automatically pack and unpack boxes.
Public class Main {public static void main (String [] args) {Integer x = 1; int y = x;}}
Click build- > in the top menu; compile the current file
Then click view-> show Bytecode with Jclasslib in the menu
You can see the bytecode in the window on the right
Through bytecode, we can see that automatic unpacking is actually the syntax sugar of the compiler, and valueOf and initValue are still executed at the bytecode level.
0 iconst_1 # take out the constant 1 1 invokestatic # 2 # valueOf static method 4 astore_1 # store the local variable table slot1 5 aload_1 # referenced to the stack frame load variable 1 to Operand stack 6 invokevirtual # 3 # intValue method 9 istore_2 # value is stored in The above slot210 return in the local variable table is the content of the article on "how idea uses the jclasslib plug-in to view bytecodes" I believe we all have a certain understanding. I hope the content shared by the editor will be helpful to you. If you want to know more about the relevant knowledge, please pay attention to the industry information channel.
