Question

Hello,

What is the answer to this Java question?

Which​ ​of​ ​the​ ​following​ ​is​ ​false​ ​with​ ​respect​ ​to​ ​local​ ​variables?

a. Their​ ​lifetime​ ​is​ ​the​ ​execution​ ​time​ ​of​ ​the​ ​method​ ​they​ ​are​ ​declared​ ​in

b. Their​ ​scope​ ​is​ ​the​ ​method​ ​they​ ​are​ ​declared​ ​in

c. They​ ​are​ ​not​ ​auto-initialised​ ​unless​ ​they​ ​are​ ​elements​ ​of​ ​an​ ​array

d. They​ ​must​ ​be​ ​primitive

e. They​ ​cannot​ ​have​ ​the​ ​same​ ​name​ ​as​ ​an​ ​instance​ ​variable​ ​in​ ​the​ ​same​ ​class

f. Select​ ​this​ ​option​ ​if​ ​you​ ​think​ ​more​ ​than​ ​one​ ​of​ ​the​ ​above​ ​false

Answer 1

The first statement is correct as the lifetime of local variables is always during ​the​ ​execution​ ​time​ ​of​ ​the​ ​method​ ​they​ ​are​ ​declared​ ​in.

The second statement is true that is their scope​ ​is​ ​the​ ​method​ ​they​ ​are​ ​declared​ ​in.

public static void Func1( int a, int b)

{

int r=a*b;

System.out.println(r);

}

public static void Func1( )

{

}

Here, the variable r has its scope and execution local to its execution method.

The third statement is also true as the local variables are used for specific purposes and it cannot have any kind of default value.

The fourth option is correct as non primitive variables are not locally defined in a function but are created by the programmer itself. So, local variables must be primitive.

The fifth option is also not correct as the name of local variable can be same as that of an instance variable in the same class.

Thus, the false statement is option e.