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

Question

Scope and lifetime axe 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: Why does this code fail to compile? What could it be modified so it would compile? Explain the reason behind this failure in terms of scope and lifetime. C++ allows pointers to stack-dynamic variables. Consider the following C++ function: Will the above function compile in C++? Is it correct? If not, under what circumstances will it fail and how should it be corrected? Consider one other language that has pointers. Does that language have the same problem? Explain.

Explanation / Answer

The correct code for

1)

you sud define a local varible to the function compareTo().

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public class AnonymousInnerClassInMethod {

public static void main(String[] args)

{

int local=1;

Comparable compare=new Comparable()

{

public int compareTo(Object value)

{

int local=1;

return (Integer)value -local;

}

};

System.out.println(compare.compareTo(5));

}

}

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