Why does this Java code compile?

Question

In method or class scope, the line below compiles (with warning):

int x = x = 1;

In class scope, where variables get their default valu

Answer 1

It's roughly equivalent to:

int x;
x = 1;
x = 1;

Firstly, int = ; is always equivalent to

int ;
 = ;

In this case, your expression is x = 1, which is also a statement. x = 1 is a valid statement, since the var x has already been declared. It is also an expression with the value 1, which is then assigned to x again.