JAVA CONCEPTS

Important Java Mcq 1

Which component is responsible to optimize bytecode to machine code?

a) JVM

b) JDK

c) JIT

d) JRE

Answer:

c) JIT

Explanation:

JIT optimizes bytecode to machine-specific language code by compiling similar bytecodes at the same time. This reduces the overall time taken for the compilation of bytecode to machine-specific language.

What is used to document a program and improve its readability?

a. Keyword b. Comment c. Control Structure d. Block Answer: b. Comment Explanation Comment can be used to explain Java code, and to make it

Which of the following is a white label error?

a. Springboot error b. Custom error c. Both a and b d. None of the above Answer: a. Springboot error Explanation: The Java Naming and

Are java and javascript the same thing?

a. Yes b. No Answer: b. No Explanation: Java and Javascript are 2 completely different languages. Java is object oriented language used to create desktop

Which of the following is not true about OOP languages?

a. A disadvantage of OOP is that you cannot reuse or modify existing objects. b. An IDE contains tools for building GUI’s, editors, a compiler