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10+ Java Interview questions and answers.
This article on Java interview questions and answers was made to highlight major technical questions for java interview purposes. It is a must-read for anyone preparing for a java interview. They are 10+ basic questions for java interviews.
We hope you find this java interview questions and answers as a good means of reviewing and internalizing your knowledge on Java

Question 1: Briefly explain four java features.
Answer: These are four Java features
Encapsulation: Encapsulation aids the programmers to develops software using the modular strategy. The encapsulation feature works as a data hiding agent and helps in object independence.
Platform Independence: A solitary program works on a different platform at various stages with no alteration.
High Performance: JIT (Just In Time compiler) empowers superior performance in Java. JIT transforms the bytecode into machine language and afterward Java Virtual Machine(JVM) begins the execution.
Multi-threading: A progression of execution is known as a Thread. Java Virtual Machine makes a main thread. The client can make different threads by actualizing the Runnable interface or by broadening the thread class.

Question 2: Multi-threading is one of the features of java, how do we ensure that only one thread has access to a resource being shared at a time?
Answer: Using synchronization, we can ensure that only one thread receives resources at a time. Synchronization through keywords makes sure that only one thread receives resources at a time and others take turns to get access when each is done.

Question 3: State the process for trash collection in java
Answer: when an item is not referenced anymore in java, trash collection happens and the item is wrecked automatically. Java carries out automatic trash collection either by System.gc() strategy or Runtime.gc() technique.

Question 4: Can a java class be compiled without the main method?
Answer: While the main method is required for executing a program, it is not required for compiling a program. A main method is only an access point for a java class and it is required for execution. Hence, a java class can be compiled but not executed without a main method

Queen 5: With the use of a model, the difference between String, String Buffer, and String Builder.
Answer: Below are the distinctions between String, strong buffer and string builder.
String: String factors are saved in a "constant string pool". When the string reference changes the old factor that exists in the "constant string pool", it can't be removed.
Model:
String name = "house" (Constant string pool)
When the value has changed from "house" to "school".
Constant string pool="School"
At this point, the modified value " School" holds in the consistent string pool and can not be changed.
String Builder: Unlike strings, string builders can be modified. They are equivalent to string buffer aside from the fact that the string builder is not synchronized. This makes it unsafe. String buffers are preferable for larger data due to their dynamic nature.
String Buffer: Here string values are put in a stack. Once the values are changed, the new value replaces the previous value. The string support is also synchronized which makes strings safe.
Model:
String Buffer name ="house";
When the value has been changed to "school" at that point the "house" is eradicated in the stack.


Question 6: How and when do we serialize an object in java?
Answer: Serialization is the conversion of an object into a byte stream. A serializable interface is executed by the class. The objects within the class executing interface are serialized and the conditions are saved in the byte stream.
Serialization is utilized when information should be transmitted over the system. Utilizing serialization, the object's state is spared and transformed into a byte stream. The byte stream is moved over the system and at the possible destination, the object is re-made.

Question 7: What are the distinction between serialization and deserialization in java?
Answer: Serialization is the procedure that is utilized to change over the objects into a byte stream. Deserialization is the contrary procedure of serialization where we can recover the items from the byte stream

Question 8: Using a different return type with the same method name and arguments, can we override a method?
Answer: We can not use a different return type to override a method. The essential state of method overriding is the technique name, arguments, and the return type. All of them must be the same with the technique being overridden.

Question 9: State the procedure for executing codes even before the main method.
Answer: To execute codes before the main method, we obtain a static block of code in that class. Execution will take place in any block of code in the class during the period of loading which is before the creation of objects in the main method.

Question 10: What are the performance ramifications of Interfaces over abstract classes?
Answer: Additional indirections are required for interfaces, this makes Interfaces slower in execution in contrast to abstract classes. Programmers would have to note that any class can broaden just one abstract class while a class can actualize numerous interfaces.

Question 11: What is the Final Keyword in Java? Give a model.
Answer: In java, a constant is announced utilizing the Final keyword. Value can be doled out just a single time and after the task, the estimated value of a constant can't be changed.
Below is a model,
A constant with the name const_val is proclaimed and allowed value:
Final int const_val=315. (The estimated value can not be changed)

Question12: Define the term "loops" in Java and list three kinds of loops.
Answer: Loops are utilized to carry out a statement or a set of statements continually in programming. These are three kinds of loops in Java:
Below are the three kinds of loops;
For Loops
A programmer uses for loops when the exact number of execution of the statement is known. For loops are utilized in java to execute articulations more than once for a given number of times.
While Loops
While loop is used to arrive at a certain condition. When a certain condition is intended to take place before the execution is terminated, while the loop is used.
Do While Loops
Do While Loop is the same as While loop with just a contrast that the condition is checked after execution of loops of statements. Subsequently in the event of do while circle, statements are executed at any rate once.

Question 13: Explain Java IDE's(Integrated Development Environments) and highlight the Java IDE's?
Answers: Java IDE's provide features that aid users in coding effortlessly. These features include syntax highlighting and code completion. Java Integrated Development Environments are software applications that allow users to successfully debug and write Java programs.
Java IDE's include; eclipse, NetBeans and intell J idea.

It is impressive if you have carefully gone through this must-read 10+ Java interview questions and answers. We hope this tutorial question helped you understand some basic Java programming knowledge and that you eventually achieve success in your pursuit.