94 Best Java Questions and Answers (Q&A) - ProProfs Discuss

Is the character pair ?: called the relational operator?

Chris Evins, College Student
Answered: Dec 02, 2019

The correct answer to this question is False. ?: is not a relational operator, it is a conditional operator. Conditional operators are used in Java programming languages. Its purpose is to select...Read More

3 Answers

436 views

Which of these (Map, Enumeration, HashMap, Hashtable) is the interface of legacy?

Kvpbusiness
Answered: Apr 25, 2024

Enumeration

1 Answer

428 views

What does an array hold?

C.Evelyn
Answered: May 06, 2018

An array is an average data structure that holds similar values of same data type. Arrays can hold references as well as primitives. For storing and accessing a sequence of objects, Array is the...Read More

2 Answers

408 views

What is the use of JavaScript?

AnandVR
Answered: Apr 25, 2024

They can be applied to both data & methods
They must precede a class s data variables or methods
They can appear in any order

1 Answer

385 views

What is garbage collection in the context of Java?

S. Hughes
Answered: Jan 28, 2021

Garbage collection in Java refers to the process by which Java programs get their own portions of the memory at their request. The garbage collection determines what memory a program needs and...Read More

4 Answers

381 views

May a null reference be used to access a static variable or method?

Chris Evins, College Student
Answered: Dec 02, 2019

The correct answer to this question is yes, a null reference may be used to access a static variable or method. If used, it will not cause any exceptions. It is not necessary for instances, while...Read More

3 Answers

380 views

Which of these method is used to avoid polling in Java?

Kvpbusiness
Answered: Apr 25, 2024

All of the mentioned

1 Answer

374 views

What displays from the following statements?

E. Stanley, Technical writer
Answered: Jul 17, 2018

Java is a complex computer language that is used to code software. Just like other languages, a specific pattern means a special thing. For instance, in this case it means Ac. In other scenarios,...Read More

2 Answers

367 views

What will be the output of the following code segment?class Number{int a;public static void main(String ar[]){ a=10;int b=20;a=a+b;b=a-b;a=a-b;System.out.println(a = +a);System.out.println(b =...

Maverick_virgo
Answered: Apr 25, 2024

Compile-time error

Non-static variable cannot be referenced from a static context. a is a non-static variable, it cannot be referenced from within main() which is static.

1 Answer

364 views

What is the difference between Aggregation and Composition?

Samantha Stewart, Philanthropist
Answered: Aug 22, 2019

In child psychology, there are terms used to describe the ways in which children can function independently. Some can function without the need of their parent, whereas others seem to cling to...Read More

3 Answers

344 views

What does the sync keyword in a method signify?

J. Rogers, Rosshazlewood
Answered: Dec 02, 2019

In Java programming, the async keyword in a method signifies the prevention of thread interference and inconsistency in memory errors. This simply means that the keyword allows only one thread at...Read More

3 Answers

344 views

What is the result?

Carice Snow, Motivator
Answered: Jan 17, 2019

It has already been stated that the directory is empty so even with the code, there will be no directory that will form and there will be no file that will be created as well. Programming m...Read More

2 Answers

343 views

Is Java still free?

John Smith
Answered: Apr 25, 2024

1
2

1 Answer

342 views

What is the difference between EJB 2.1 and EJB 3.0?

J. Harty, Writer
Answered: Aug 29, 2019

EJB 2.1 is considered to be the older version of the EJB 3.0. They have some similarities with each other, but the EJB 3.0 is the more updated version. There is a difference with their interface...Read More

3 Answers

337 views

What could be the output of this java code?

Krisz
Answered: Aug 05, 2020

A NumberFormatException is thrown by the parse method at runtime.

2 Answers

336 views

Java Questions and Answers (Q&A)

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