What are static code blocks for? [duplicate]

StackOverflow https://stackoverflow.com/questions/17924947

  •  04-06-2022
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質問

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?

役に立ちましたか？

解決

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

他のヒント

  • 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.

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

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