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Objects and Classes Questions

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Choose the correct option.

Which of the following is true.


AA class that is abstract may not be instantiate

BThe final keyword indicates that the body of a method is to be found elsewher The code is written in non-Java language, typically in C/C++.

CA static variable indicates there is only one copy of that variable

DA method defined as private indicates that it is accessible to all other classes in the same packag

EBoth A & C

Answer: Option E

Explanation:

Here is no explanation for this answer

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Choose the correct option.

How can you ensure that the memory allocated by an object is free Select the one correct answer.


ABy invoking the free method on the object.

BBy calling system.gc() metho

CBy setting all references to the object to new values (say null).

DGarbage collection cannot be force The programmer cannot force the JVM to free the memory used by an object.

Answer: Option D

Explanation:

Here is no explanation for this answer

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Choose the correct option.

A constructor operation does which of the following?


ACreates a new instance of a class

BUpdates an existing instance of a class

CDeletes and existing instance of a class

DAll of the above.

Answer: Option A

Explanation:

Here is no explanation for this answer

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Choose the correct option.

What is the output for the below code ?

public class Test {
public static void main(String... args) {
int a =5 , b=6, c =7;
System.out.println("Value is "+ b +;
System.out.println(a + b +;
System.out.println("String "+(b+);
}
}


AValue is 67 18 String 13

BValue is 13 18 String 13

CValue is 13 18 String

DCompilation fails

Answer: Option A

Explanation:

If the left hand operand is not a String then + operator treat as plus BUT if left hand operand is a String then + perform String concatenation.

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5 / 18

Choose the correct option.

Which of the following are correct. Select the one correct answer.


AAn import statement, if defined, must always be the first non-comment statement of the fil

Bprivate members are accessible to all classes in the same packag

CAn abstract class can be declared as final.

DLocal variables cannot be declared as static

Answer: Option D

Explanation:

Here is no explanation for this answer

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Choose the correct option.

Select the one correct answer. Which method defined in Integer class can be used to convert an Integer object to primitive int type


AvalueOf

BintValue

CgetInt

DgetInteger

Answer: Option B

Explanation:

Here is no explanation for this answer

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Choose the correct option.

Is the following statement true or false, As the toString method is defined in the Object class, System.out.println can be used to print any object.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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Choose the correct option.

Name the keyword that makes a variable belong to a class, rather than being defined for each instance of the class. Select the one correct answer.


Astatic

Bfinal

Cabstract

Dnative

Answer: Option A

Explanation:

Here is no explanation for this answer

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Choose the correct option.

What is the return type of method round(double d) defined in Math class.


Along

Bshort

Cdouble

Dfloat

Answer: Option A

Explanation:

Here is no explanation for this answer

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Choose the correct option.

Select the one correct answer. The number of characters in an object of a class String is given by


AThe member variable called size

BThe member variable called length

CThe method size() returns the number of characters.

DThe method length() returns the number of characters.

Answer: Option D

Explanation:

Here is no explanation for this answer

Workspace

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