TCS JAVA Real Interview by TCS Team for fresher , TCS Interview Preparation By TCS TeamVote
Q1. Which, according to you, are the most significant features of Java 8?
Answer: Most developers have stuck to the 2014 release, Java 8. It is free for commercial use and has many significant features such as functional interfaces and static methods. It has made programming more simplified and efficient with functional interfaces to object-oriented interfaces.
Q2. What is a Java Class? Can you tell us about some of the common classes of Java?
Answer: A Java Class is a category for Java objects presenting similar properties or methods. It is commonly used as a blueprint for design in object-oriented languages. The most common classes of Java used in app development are static, final, concrete, inner, abstract, and POJO.
Q3. What are the essential concepts to understand in wrapper classes?
Answer: The most significant concepts to understand in wrapper classes are the eight primitive types of wrapper classes and where they are best used. It is important to note that it is final and immutable once a wrapper class is assigned.
Q4. What are the four access modifiers in Java, and where are they used?
Answer: The four access modifiers in Java are default, public, private, and protected. They are used in determining access levels to keywords or information stored in a class.
Q5. Differentiate between JVM and JDK.
Answer: A JVM, or a Java Virtual Machine, runs Java on a device. A JDK, or Java Development Kit, is a software development package used to create tools that can be run on phones and tablets.
Q6. What is platform independence?
Answer: Platform independence implies that your program can run on any operating system. This adaptability trait makes Java a superior programming language.
Q7. What is the main reason why strings are made immutable?
Answer: An immutable string is thread-safe. If one does not make a string immutable, then a change in one reference will inevitably affect the values of other references.
Q8. What is the difference between an abstract class and an interface?
Answer: There are some basic differences between an abstract class and an interface. The first is method implementation. While an abstract class can have method implementation but an interface can not. An abstract class can implement an interface.
Q9. What do you understand about a ternary operator?
Answer: Java has several conditional operators. A ternary operator is a conditional operator responsible for deciding which values will be assigned to a variable.
Q10. Let’s talk about serialization and deserialization a little.
Answer: Sure! Serialization and deserialization are data handling concepts related to stream handling in Java. Serializing an object means converting it to a byte stream to save or relocate it to another device. Deserializing is the process of undoing the serialization process.
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We are a team of 4 people, all into Java development, we faced this problem of interview questions and planned to resolve this issue, so we started sharing this real-time experience.