What is the use of curly brackets in Java?

Question

So I just started learning Java and I always get confused by the curly brackets in example code.
Are there any rules for it's placement and rules that I should know?

Answer 1

They define a block of code.
It could be a method or a class or a static block or an instance initializer block.

You must use them with the above mentioned or your code will throw a compile time error.