Inner Class Compilation Issue

[Md. Nazmus Salahin Rocky]

In Inner Class chapter of Kathy Sierra book say this code will not compile because methods local variable z in Method "doStuff" used in methods local inner class "MyInner"

class MyOuter2 {
 private String x = "Outer2";
 void doStuff() {
    String z = "local variable";
    class MyInner {
    public void seeOuter() {
    System.out.println("Outer x is " + x);
    System.out.println("Local var z is " + z);
} // close inner class method
}
// close inner class definition
}
// close outer class method doStuff()
}
// close outer class

But in my compiler this code compile fine and also run.
so is the book correct?

[Paweł Baczyński]

Welcome to the Ranch!

Please, UseCodeTags (← click this) when posting. I have added them for you this time.

The book is correct. That code would not compile when compiled using javac version up to 1.7 because the z variable would need to be declared final.
However, this requirement has been relaxed since java 1.8. Now, the variable needs to be effectively final (not modified anywhere).