Java Interview Question | Core Java Interview Question Series | Part 1

20 Java interview questions.

This is the first part of the Java interview questions. In this article, we will discuss the first 20 JAVA interview questions. These questions are the basic ones. Hope you like this initiation!

 Q.1 What is software

Ans. Software is a set or collection of programs that helps to solve the real-world problems.

Q.2 What is the program?

Ans. A program is a set of instructions or statements 

Q.3 What is instruction?

Ans. The sentences we are using in the programming language are known as instructions or statements.

Q.4 What is programming?

Ans. Programming is the skill of writing a program.

Q.5 What is a programming language?

Ans. Programming language is the medium or language which is used to give some instruction to the machine or computer to perform some specific task

Q.6 What is JDBC?

Ans. JDBC stands for Java database connectivity, By JDBC we are making a connection between Java application and the database to store and retrieve the data from the database

Q.7 What is a servlet?

Ans. It is the skill to communicate with the server with the help of Java.

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Q.8 What are the different types of programming languages?

Ans. Based on the levels of programming language, it is of 3 types

1). Low-level language 2). Mid-level language 3). High-level language

Q.9 What is assembler?

Ans. Assembler is used to convert the mid-level into low-level language. As mid-level is not understandable by machines, we use a mid-level machine-understandable assembler to convert the mid-level machine-understandable language into machine-understandable language.

Q.10 Disadvantages of mid-level language

Ans. 1). It has limited words to perform limited task ex. add, mul, etc. 2). It does not have a control statement to control the flow of the execution.

Q.11 What is a compiler?

Ans. Compilerhigh-level is used to convert high level language into low-level language in a single shot. Every programming language has its own compiler.

Q.12 What is an interpreter?

Ans. An interpreter is used to convert high-level language into low-level language line by line. Every programming language has its own interpreter.

Q.13 What are the different types of software?

Ans. 1) System software 2). Application software 3). Utility software

Q.14 What is Java?

Ans. Java is a high level programming language that is used to develop the application as well as perform the test automation by using some automation tools such as Selenium

Java was developed by James Gosling in 1995 at SunOracle microsystem. It was acquired by oracle ineditions 2010.  First name of Java is "Oak"

Q.15 What are the different edition of JAVA

Ans. 1). J2SE/JSE ( Java standard edition) It is used to create or develop standalone applications such as calculators, notepads, etc.

2). J2EE/JEE: Java Enterprise edition. It is used to develop client-server applications or web applications ex. Facebook etc.

3). J2ME/JME: Java micro edition. It is used to applications micro applications such as mobile applications ex. Gpay etc.

Q.16. What is standalone application?

Ans. An application that can be installed and run on a device without requiring an internet connection ex. calculator, notepad, etc.

Q.17 What are the different architectures?

Ans. 1). Von neuman architecture 2). ARM 3). RISC 4). CISC 5). Embedded. Java supports all types of architecture that's why Java is architectural neutral.

Q.18 What is a platform?

Ans. It is the combination of operating system and processor.

Q.19 What is a processor?

Ans. The Processor is used to execute or process the instruction which is given by users to the system. Based on the size of the instructions, there can be two types 1).32-bit processor, 2). the 64-bit processor.

Q.20 What is a Java source file.

Ans. The file which is written by the programmer in Java language with extension .java, is known as a Java source file.

Hope you like this article!

Thanks,

Rajat Bhatti

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