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JAVA Constructors and Methods

JAVA Constructors and Methods
What is Math.floor(3.6)?

4
3
4.0
3.0

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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 ?

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

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JAVA Constructors and Methods
The finalize() method is called just prior to

Before garbage collection.
A variable goes out of scope.
An object, variable or method goes out of scope.
An object or variable goes out of scope.
None of these

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JAVA Constructors and Methods
What is the output for the below code ?class A{ public A(){ System.out.println("A"); } public A(int i){ this(); System.out.println(i); }}class B extends A{ public B(){ System.out.println("B"); } public B(int i){ this(); System.out.println(i+3); }}public class Test{ public static void main (String[] args){ new B(5); }}

A B 5
B 8 A 5
None of these
A 5 B 8
A B 8

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JAVA Constructors and Methods
What will be the return type of a method that not returns any value?

void
int
double
None of these

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JAVA Constructors and Methods
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 45
does not compile
None of these
The sum of x and y is 9

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