Scope and lifetime are distinct yet related issues in programming languages. Lan

Question

Scope and lifetime are distinct yet related issues in programming languages. Languages can sometimes make design decisions that cause a conflict between the scope and the lifetime of variables. Java's decision to allow classes to be defined inside a method illustrates this conflict. Consider the following example: class AnonymousInnerClassInMethod { public static void main(String[] args) { int local = 1; Comparable compare = new Comparable () { public int compareTo(Object value) { return (Integer)value - local; } }; System.out.println(compare.compareTo(5)); } }

Explanation / Answer

Cannot refer to a non-final variable local inside an inner class defined in a different method change local to final int local //changed code class AnonymousInnerClassInMethod { public static void main(String[] args) { final int local = 1; Comparable compare = new Comparable () { public int compareTo(Object value) { return (Integer)value - local; } }; System.out.println(compare.compareTo(5)); } }

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