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JAVA Constructors and Methods

JAVA Constructors and Methods
The variables declared in a class for the use of all methods of the class are called

instance variables
None of these
objects
reference variables

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JAVA Constructors and Methods
The main method should be static for the reason

None of these
It can be accessed easily by the class loader.
It can be accessed by every method or variable without any hindrance.
It can be executed without creating any instance of the class.

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JAVA Constructors and Methods
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 10
Prints 0
None of these
Compilation Fails

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JAVA Constructors and Methods
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 ) ; } }

None of these
Compile time error
0
2.0

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

public MyClass(){}
1 and 3
public MyClass(void){}
MyClass(){}
MyClass(void) {}

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JAVA Constructors and Methods
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 ?

None of these
A a = new A(String s);
A a = new B(5);
All of these
A a = new B();

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