What are static code blocks for? [duplicate]

Question

This question already has answers here:

Static Initialization Blocks (14 answers)

Closed 3 years ago.

I want to ask what javap shows besides the public fields and methods of the classes passed to it.

I was reviewing a class file having only a static variable. As expected, javap shows the static variable and class constructor as output but it also shows something like:

static {};

What does this line mean?

Answer 1

static code block initializes the static variables in the program. it gets executed when the class is initiated, even before constructor call.

Answer 2

• This is a static block which is used for initializing values
• This block gets executed when the class is initialized
• The static initializer block is executed whenver the class is initialized and the order of execution is according to their appearance in program.

Answer 3

javap -private -verbose class will show you the constant pool and the details of the method bytecode.