JAVA CONSTRUCTORS AND METHODS QUIZ

What will be the result of compiling and running the given code?class A{ int b=10; private A(){ this.b=7; } int f(){ return b; }}class B extends A{ int b;}public class Test{ public static void main(String[] args){ A a = new B(); System.out.println(a.f()); }}

Prints 0

Compilation Fails

Prints 7

Prints 10

None of these

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Which of these is a legal definition of a method named examveda assuming it throws IOException, and returns void. Also assume that the method does not take any arguments. Select the one correct answer.

void examians() throws IOException{}

examians() throws IOException{}

void examians(void) throws IOException{}

void examians() {} throws IOException

void examians() throw IOException{}

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The variables declared in a class for the use of all methods of the class are called

None of these

instance variables

reference variables

objects

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Determine output of the following program.public class Test{ public static void main(String args[]){ System.out.println( Math.floor( Math.random( ) ) ) ; }}

1.0

0.5

0.0

10.0

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Determine output:public class Test{ public static void main(String args[]){ MyClass obj = new MyClass(); obj.val = 1; obj.call(obj); System.out.println(obj.val); }}class MyClass{ public int val; public void call(MyClass ref){ ref.val++; }}

3

1

2

Compilation Error

None of these

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What is the output of the above program ?class Num { Num(double x ){ System.out.println( x ) ; } }public class Test extends Num { public static void main(String[] args){ Num num = new Num( 2 ) ; } }

2.0

Compile time error

None of these

0

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class MyClass{int i;int j;public MyClass(int i, int j){this.i = i;this.j = j;}public void call(){System.out.print("One");}}public class Test{public static void main(String args[]){MyClass m = new MyClass(); //line 1m.call(); //line 2}}

One

Compilation fails due to an error on line 1

Compilation fails due to an error on line 2

Compilation succeed but no output.

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public class MyClass{ }For the above class(MyClass) what is the correct way of declaring constructor?

MyClass(){}

1 and 3

public MyClass(){}

MyClass(void) {}

public MyClass(void){}

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class A{ A(String s){} A(){}}1. class B extends A{2. B(){}3. B(String s){4. super(s);5. }6. void test(){7. // insert code here8. }9. }Which of the below code can be insert at line 7 to make clean compilation ?

A a = new A(String s);

A a = new B();

All of these

None of these

A a = new B(5);

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In which area of memory, the system stores parameters and local variables whenever a method is invoked?

Heap

Storage Area

Stack

Array

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