Why can we not initialize instance variable in two steps like [duplicate]

Replace the code with int n = 1;

And this question seems to be the duplicate of Java instance variable declare and Initialize in two statements.

I don't have enough privileges, someone with the privileges, please label it as 'duplicate'.

Solution as already pointed in other answers is: writing int n =1; as single line.

But if you want to understand the reason for this error, it is that you cannot have statements inside the class body. Statements can only be inside methods/constructors/initialization blocks as @Eran pointed out.

When you do int n = 1; in single line, it's a special statement/expression and is called definition. So it's allowed as a special case.

Read more about statements and expressions here: JAVA statements and expressions

However, this is possible:

public class A{
    int n;
    {
       n = 1;
    }
}