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 7

Prints 0

None of these

Compilation Fails

Prints 10

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What is the expected output?public class Profile { private Profile(int w) { // line 1 System.out.print(w); } public static Profile() { // line 5 System.out.print (10); } public static void main(String args[]) { Profile obj = new Profile(50); }}

Won't compile because of line (5), constructor can't be static

10 50

Won't compile because of line (1), constructor can't be private

50

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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( ) ) ) ; }}

0.0

1.0

10.0

0.5

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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}}

Compilation succeed but no output.

Compilation fails due to an error on line 2

Compilation fails due to an error on line 1

One

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

reference variables

objects

instance variables

None of these

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What is the output of the program?class Test{ public int display(int x, int y){ return ("The sum of x and y is " + x + y); } public static void main(String args[]){ Test test = new Test(); System.out.println(test.display(4,5)); } }

The sum of x and y is 9

The sum of x and y is 45

None of these

does not compile

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What is Math.floor(3.6)?

4.0

3.0

4

3

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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(void) throws IOException{}

examians() throws IOException{}

void examians() throw IOException{}

void examians() throws IOException{}

void examians() {} throws IOException

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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 B(5);

A a = new B();

None of these

All of these

A a = new A(String s);

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What is the expected output?class Animal {Animal() {System.out.println("Animal");}}class Wild extends Animal{Wild() {System.out.println("Wild");super();}}public class Test {public static void main(String args[]) {Wild wild = new Wild();}}

Animal Wild

Compilation Error

Wild Animal

Runtime Exception

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