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Interview Questions and Answers - Order By Rating

Q3421. What is struts.devMode?

Ans. The struts.devMode is used to make sure that framework is running in development mode or production mode by setting true or false.

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Q3422. What is use of Revert in SVN?

Ans. Revert your local changes.

There are 2 types of reverts -

1) Local Revert: It will delete all changes from files which you made after updates and before commit.
2) Repo Revert: Upload the changes to previous Repo.

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Q3423. Can we have multiple threads consuming message stream from a single partition ?

Ans. Yes, by having multiple Consumer Groups.

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Q3424. Can we have multiple threads consuming messages from a single partition if we have single Consumer Group ?

Ans. No, we can only have max 1 thread per partition in a single Consumer Group.

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Q3425. If we have more threads than partitions in a kafka consumer, How can we model it efficiently ?

Ans. We will have to use multiple consumer groups in that case as threads will remain idle if we use single consumer group. A more sophisticated algorithm could be required with multiple groups if we have to ensure the order of consumption.

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Q3426. Why Java is not considered pure OOP's language ?

Ans. There are 2 reasons for it.

1. Usage of Primitive types - Though Java provides classes for the primitive data types but as the usage of primitives is permissible, its considered unpure OOP's language.

2. Usage of Static members - Static members belong to the class and not objects and hence not considered fit for pure OOP's programming.

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Q3427. Is Iterator a class ?

Ans. No, iterator is an interface that is used to parse through the elements of a Collection

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Q3428. Can a lock be acquired on a class? How is it different than the object level lock ?

Ans. Yes, a lock can be acquired on the class. Class level lock is applicable on the whole class and hence on all objects of the class whereas the object level lock is applicable on the respective object.

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Q3429. Difference between Yielding and Sleeping ?

Ans. When a task invokes its yield method, it returns to the ready state. When a task invokes its sleep method, it returns to the waiting state.

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Q3430. What is the use of Runtime Class ?

Ans. This class is used to provide access to the Java runtime system

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Frequently asked.

Q3431. What should a class do if its implementing an interface ?

Ans. It should either implement all interface methods or declare unimplemented methods as abstract.

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Q3432. What should a class do if its extending an abstract class ?

Ans. It should either implement the abstract methods or re-declare them abstract.

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Q3433. What is a compilation unit in Java ?

Ans. Java Source Code File

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Q3434. What is Associativity while evaluating a Java statement ?

Ans. Associativity determines whether an expression is evaluated left-right or right-left. When an expression has two operators with the same precedence, the expression is evaluated according to its associativity.

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Q3435. What is a package and what are its advantages ?

Ans. Package is a namespace that organizes a set of related classes.

Advantages of Packages

1. Better Organization of classes.
2. Saves from the problem of duplicate names as duplicate class names are allowed across different packages.

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Q3436. When String literals are compared using ==, they always returns true if the string values are same because .. Reference

a. of overridden compareTo method

b. of overridden compare method

c. of String Pool

d. == means that the object contents are equal

Ans.c. of String Pool

Q3437. Which of the following is true ?

a. Composition is Tightly Bound

b. Inheritance is Tightly Bound

c. Object can only hold reference of only one other object

d. A Class cannot be extended by multiple classes

Ans.b. Inheritance is Tightly Bound

Q3438. In case of String Literals .. Reference

a. x==y on all literals always returns false

b. x.equals(y) on all literals always returns false

c. if x.equals(y) returns true, x==y returns true too

d. if x.equals(y) returns false, x==y returns true

Ans.c. if x.equals(y) returns true, x==y returns true too

Q3439. What is a default constructor ? Reference

a. Constructor without parameters declared by user

b. Constructor provided by Java if no constructor is declared

c. Constructor with empty body

d. All of the above

Ans.b. Constructor provided by Java if no constructor is declared

Q3440. How can we create objects if we make the constructor private ?

a. We can't create objects if constructor is private

b. We can only create objects if we follow singleton pattern

c. We can only create one object

d. We can create new object through static method or static block

Ans.d. We can create new object through static method or static block

Q3441. What will be the output of following ?

String str1 = new String("String1");
String str2 = new String("String1");
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

a. falsetruetrue

b. truetruetrue

c. truetruefalse

d. falsetruefalse

Ans.a. falsetruetrue

Q3442. What will be the output of following code ?

String str1 = "String1";
String str2 = "String1";
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

a. falsetruetrue

b. falsefalsetrue

c. truetruetrue

d. falsefalsefalse

Ans.c. truetruetrue

Q3443. What will be the output of following code ?

String str1 = "String1";
String str2 = "String2";
str1.concat("String3");
System.out.print(str1);
System.out.print(str2);

a. String1String2

b. String1String3String3

c. String1String3String1String3

d. String1String1

Ans.a. String1String2

Q3444. What will be the output of following code ?

String str1 = "String1";
String str2 = "String2";
str1=str1.concat("String3");
System.out.print(str1);
System.out.print(str2);

a. String1String2

b. String1String3String2

c. String1String2String3

d. String1Stringg3String1

Ans.b. String1String3String2

Q3445. Which method needs to be implemented if a class is implementing comparable interface ?

a. comp

b. compare

c. compareTo

d. compareEquals

Ans.c. compareTo

Q3446. Which of the following is false ?

a. A Class cannot override both hashcode and equals method.

b. A class can override both hashcode and equals method.

c. A Class must override hashCode method if its overridding equal method.

d. A Class can override hashCode even if its not overridding equals method.

Ans.a. A Class cannot override both hashcode and equals method.

Q3447. Collections is a / an ..

a. interface

b. abstract class

c. final class

d. util class

Ans.d. util class

Q3448. Which of the following can throw ClassCastException ?

a. UpCasting

b. DownCasting

c. Casting to incompatible data type

d. Casting to Strings

Ans.b. DownCasting

Q3449. Which of the following can be overridden ? Reference

a. final instance methods

b. final static methods

c. non final instance methods

d. non final static methods

Ans.c. non final instance methods

Q3450. x instanceOf y returns false ..

a. if x is an instance of y class

b. if x is an instance of class implementing y interface

c. if x is an instance of class extending y class

d. if x is an instance of Class which is a parent of Y class

Ans.d. if x is an instance of Class which is a parent of Y class

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