Interview Questions and Answers
Freshers / Beginner level questions & answers
Ques 1. What is the purpose of the 'super' keyword in Java?
The 'super' keyword in Java is used to refer to the immediate parent class object. It is often used to call the parent class's methods, access its fields, and invoke the parent class's constructor.
Example:
Example:
class Subclass extends Superclass {
void display() {
super.display(); // calls the display method of the parent class
}
}
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Ques 2. What is the 'this' keyword in Java?
'this' refers to the current instance of the class. It is used to differentiate instance variables from local variables when they have the same name. 'this' is also used to invoke current class methods and constructors.
Example:
Example:
public class MyClass {
int x;
void setX(int x) {
this.x = x; // sets the instance variable x
}
}
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Ques 3. Explain the concept of method overloading in Java.
Method overloading allows a class to have multiple methods with the same name but different parameters. The compiler determines which method to call based on the number and types of arguments passed.
Example:
Example:
class MathOperations {
int add(int a, int b) {
return a + b;
}
double add(double a, double b) {
return a + b;
}
}
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Ques 4. Explain the 'instanceof' operator in Java.
The 'instanceof' operator is used to test if an object is an instance of a particular class or interface. It returns a boolean value: 'true' if the object is an instance, and 'false' otherwise.
Example:
Example:
if (myObject instanceof MyClass) {
// do something
}
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Ques 5. What is the purpose of the 'break' statement in Java?
The 'break' statement is used to terminate the loop or switch statement. It is often used to exit a loop prematurely when a certain condition is met.
Example:
Example:
for (int i = 0; i < 10; i++) {
if (i == 5) {
break; // exit the loop when i is 5
}
}
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Ques 6. Explain the 'String' class and why it is immutable in Java.
The 'String' class in Java represents a sequence of characters. It is immutable to enhance performance and security. Once a 'String' object is created, its value cannot be changed. Any operation that appears to modify the 'String' actually creates a new 'String' object.
Example:
Example:
String str = 'Hello';
str = str.concat(' World'); // creates a new String object
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Ques 7. What is the 'java.lang.Math' class in Java, and how is it used?
'java.lang.Math' is a utility class in Java that provides mathematical functions. It includes methods for basic arithmetic, trigonometry, logarithms, exponentiation, and more. The methods are static and can be used without creating an instance of the 'Math' class.
Example:
Example:
double result = Math.sqrt(25.0); // calculates the square root
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Ques 8. What is the 'Java Virtual Machine (JVM)' and its role in Java?
The JVM is a virtual machine that enables a computer to run Java programs. It interprets Java bytecode and translates it into machine code for the host system. The JVM provides platform independence, as Java programs can run on any device that has a compatible JVM installed.
Example:
No specific example, as the JVM itself is not directly programmable.
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Intermediate / 1 to 5 years experienced level questions & answers
Ques 9. What is the difference between an interface and an abstract class?
An abstract class can have both abstract and concrete methods, while an interface can only have abstract methods. In Java, a class can implement multiple interfaces but can extend only one abstract class.
Example:
Abstract class example:
abstract class Shape {
abstract void draw();
}
Interface example:
interface Shape {
void draw();
}
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Ques 10. Explain the concept of multithreading in Java.
Multithreading in Java allows multiple threads to execute concurrently. It improves the performance and responsiveness of a program. The 'Thread' class and 'Runnable' interface are commonly used to create and manage threads in Java.
Example:
Example:
class MyThread extends Thread {
public void run() {
// thread execution logic
}
}
MyThread t1 = new MyThread();
t1.start();
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Ques 11. Explain the 'try', 'catch', 'finally' blocks in Java Exception Handling.
'try' block contains the code that might throw an exception. 'catch' block handles the exception if it occurs. 'finally' block always executes, whether an exception is thrown or not. It is used for cleanup activities.
Example:
Example:
try {
// code that may throw an exception
}
catch (Exception e) {
// handle the exception
}
finally {
// cleanup code
}
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Ques 12. What is the purpose of the 'static' keyword in Java?
'static' is used to create class-level variables and methods. It means the variable or method belongs to the class rather than a specific instance. 'static' members can be accessed using the class name.
Example:
Example:
class MyClass {
static int count;
static void incrementCount() {
count++;
}
}
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Ques 13. What is the 'final' keyword in Java?
'final' is used to restrict the modification of classes, methods, and variables. A 'final' class cannot be inherited, a 'final' method cannot be overridden, and a 'final' variable cannot be reassigned after initialization.
Example:
Example:
public final class ImmutableClass {
// class definition
}
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Ques 14. What is the difference between 'throw' and 'throws' in Java?
'throw' is used to explicitly throw an exception, while 'throws' is used in method signatures to declare the exceptions that the method might throw. Multiple exceptions can be declared using a comma-separated list in 'throws'.
Example:
Example:
void myMethod() throws CustomException {
// method implementation
}
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Ques 15. Explain the concept of method overriding in Java.
Method overriding allows a subclass to provide a specific implementation of a method that is already defined in its superclass. The overridden method in the subclass should have the same signature (name, return type, and parameters).
Example:
Example:
class Animal {
void makeSound() {
System.out.println('Generic Animal Sound');
}
}
class Dog extends Animal {
void makeSound() {
System.out.println('Bark');
}
}
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Ques 16. Explain the concept of the 'equals()' and 'hashCode()' contract.
According to the contract, if two objects are equal (according to the 'equals()' method), their hash codes must be equal as well. However, the reverse is not necessarily true: two objects with equal hash codes may not be equal.
Example:
It's important to ensure that the 'equals()' and 'hashCode()' methods are consistently implemented to maintain this contract.
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Ques 17. What is the purpose of the 'default' method in Java interfaces?
The 'default' method in Java interfaces provides a default implementation for a method. It allows adding new methods to interfaces without breaking existing implementations.
Example:
Example:
interface MyInterface {
default void myMethod() {
// default implementation
}
}
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Ques 18. Explain the 'Comparator' interface in Java.
The 'Comparator' interface is used to define custom ordering for objects. It provides two methods: 'compare()' to compare two objects and 'equals()' to check if two objects are equal. 'Comparator' is often used with sorting algorithms or data structures that require custom ordering.
Example:
Example:
class MyComparator implements Comparator{
public int compare(MyClass obj1, MyClass obj2) {
// custom comparison logic
}
}
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Ques 19. Explain the 'super()' constructor in Java.
'super()' is used to invoke the constructor of the immediate parent class. It should be the first statement in the constructor of the subclass. If not explicitly called, the compiler inserts a 'super()' call by default.
Example:
Example:
class Subclass extends Superclass {
Subclass() {
super(); // invokes the constructor of the parent class
}
}
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Ques 20. Explain the 'try-with-resources' statement in Java.
The 'try-with-resources' statement is used to automatically close resources (like files or sockets) at the end of the try block. Resources must implement the 'AutoCloseable' interface. It simplifies resource management and reduces the chances of resource leaks.
Example:
Example:
try (BufferedReader br = new BufferedReader(new FileReader('file.txt'))) {
// code that uses 'br'
} catch (IOException e) {
// handle the exception
}
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Ques 21. Explain the 'java.util.Collections' class in Java.
'java.util.Collections' is a utility class that provides static methods for operating on collections (e.g., lists, sets, and maps). It includes methods for sorting, shuffling, searching, and synchronizing collections.
Example:
Example:
ListmyList = new ArrayList<>();
Collections.addAll(myList, 'Java', 'Python', 'C++');
Collections.sort(myList); // sorts the list
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Ques 22. Explain the concept of 'immutable objects' in Java.
Immutable objects are objects whose state cannot be modified after they are created. Once an immutable object is created, its state remains constant throughout its lifetime. String, Integer, and BigDecimal are examples of immutable classes in Java.
Example:
Example:
final class ImmutableClass {
private final int value;
public ImmutableClass(int value) {
this.value = value;
}
public int getValue() {
return value;
}
}
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Experienced / Expert level questions & answers
Ques 23. What is the difference between '==', 'equals()', and 'hashCode()' methods in Java?
'==' is used to compare object references, 'equals()' is used to compare object content, and 'hashCode()' returns the hash code value of an object. It is recommended to override 'equals()' and 'hashCode()' when dealing with custom classes.
Example:
Example:
@Override
public boolean equals(Object obj) {
// custom implementation
}
@Override
public int hashCode() {
// custom implementation
}
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Ques 24. Explain the concept of garbage collection in Java.
Garbage collection in Java automatically reclaims the memory occupied by objects that are no longer reachable. The 'java.lang.System.gc()' method and the 'finalize()' method are related to garbage collection.
Example:
No specific example, as garbage collection is a background process handled by the JVM.
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Ques 25. What is the purpose of the 'transient' keyword in Java?
'transient' is used to indicate that a variable should not be serialized during object serialization. The value of a transient variable is not persisted when the object is stored.
Example:
Example:
class MyClass implements Serializable {
transient int sensitiveData;
}
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Ques 26. What is the 'volatile' keyword in Java?
'volatile' is used to indicate that a variable's value may be changed by multiple threads simultaneously. It ensures that the variable is always read from and written to the main memory, avoiding thread-local caching.
Example:
Example:
volatile boolean flag = true;
// variable shared among multiple threads
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Ques 27. What is the purpose of the 'assert' statement in Java?
The 'assert' statement is used for debugging purposes to check if a given boolean expression is true. If it's false, an 'AssertionError' is thrown. 'assert' statements can be enabled or disabled during runtime using the '-ea' or '-da' JVM options.
Example:
Example:
int x = -1;
assert x >= 0 : 'x should be non-negative';
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Ques 28. What is the 'classpath' in Java, and how is it set?
The 'classpath' is a parameter in the Java Virtual Machine (JVM) that specifies the location of user-defined classes and packages. It can be set using the '-classpath' or '-cp' option when running Java applications. It includes directories, JAR files, and ZIP archives containing Java classes.
Example:
Example:
java -cp myapp.jar com.example.MyClass
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Ques 29. What is the 'NaN' value in Java, and how is it represented?
'NaN' (Not a Number) is a special floating-point value used to represent undefined or unrepresentable results of mathematical operations. It is typically the result of operations like 0.0/0.0 or Math.sqrt(-1). 'NaN' is represented using the 'Double.NaN' constant.
Example:
Example:
double result = 0.0 / 0.0; // results in NaN
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Ques 30. What is the purpose of the 'java.util.concurrent' package in Java?
The 'java.util.concurrent' package in Java provides a framework for concurrent programming. It includes classes and interfaces for thread management, concurrent collections, synchronization utilities, and high-level concurrency abstractions.
Example:
Example:
ExecutorService executor = Executors.newFixedThreadPool(5);
executor.submit(() -> System.out.println('Hello, concurrent world!'));
executor.shutdown();
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| Informatica 面接の質問と回答 - Total 48 questions |
| Log4j 面接の質問と回答 - Total 35 questions |
| JBoss 面接の質問と回答 - Total 14 questions |
| Java Mail 面接の質問と回答 - Total 27 questions |
| Java Applet 面接の質問と回答 - Total 29 questions |
| Google Gson 面接の質問と回答 - Total 8 questions |
| Java 21 面接の質問と回答 - Total 21 questions |
| Apache Camel 面接の質問と回答 - Total 20 questions |
| Struts 面接の質問と回答 - Total 84 questions |
| RMI 面接の質問と回答 - Total 31 questions |
| Java Support 面接の質問と回答 - Total 30 questions |
| JAXB 面接の質問と回答 - Total 18 questions |
| Apache Tapestry 面接の質問と回答 - Total 9 questions |
| JSP 面接の質問と回答 - Total 49 questions |
| Java Concurrency 面接の質問と回答 - Total 30 questions |
| J2EE 面接の質問と回答 - Total 25 questions |
| JUnit 面接の質問と回答 - Total 24 questions |
| Java OOPs 面接の質問と回答 - Total 30 questions |
| Java 11 面接の質問と回答 - Total 24 questions |
| JDBC 面接の質問と回答 - Total 27 questions |
| Java Garbage Collection 面接の質問と回答 - Total 30 questions |
| Spring Framework 面接の質問と回答 - Total 53 questions |
| Java Swing 面接の質問と回答 - Total 27 questions |
| Java Design Patterns 面接の質問と回答 - Total 15 questions |
| JPA 面接の質問と回答 - Total 41 questions |
| Java 8 面接の質問と回答 - Total 30 questions |
| Hibernate 面接の質問と回答 - Total 52 questions |
| JMS 面接の質問と回答 - Total 64 questions |
| JSF 面接の質問と回答 - Total 24 questions |
| Java 17 面接の質問と回答 - Total 20 questions |
| Spring Boot 面接の質問と回答 - Total 50 questions |
| Servlets 面接の質問と回答 - Total 34 questions |
| Kotlin 面接の質問と回答 - Total 30 questions |
| EJB 面接の質問と回答 - Total 80 questions |
| Java Beans 面接の質問と回答 - Total 57 questions |
| Java Exception Handling 面接の質問と回答 - Total 30 questions |
| Java 15 面接の質問と回答 - Total 16 questions |
| Apache Wicket 面接の質問と回答 - Total 26 questions |
| Core Java 面接の質問と回答 - Total 306 questions |
| Java Multithreading 面接の質問と回答 - Total 30 questions |
| Pega 面接の質問と回答 - Total 30 questions |
| ITIL 面接の質問と回答 - Total 25 questions |
| Finance 面接の質問と回答 - Total 30 questions |
| JIRA 面接の質問と回答 - Total 30 questions |
| SAP MM 面接の質問と回答 - Total 30 questions |
| SAP ABAP 面接の質問と回答 - Total 24 questions |
| SCCM 面接の質問と回答 - Total 30 questions |
| Tally 面接の質問と回答 - Total 30 questions |
| Ionic 面接の質問と回答 - Total 32 questions |
| Android 面接の質問と回答 - Total 14 questions |
| Mobile Computing 面接の質問と回答 - Total 20 questions |
| Xamarin 面接の質問と回答 - Total 31 questions |
| iOS 面接の質問と回答 - Total 52 questions |
| Laravel 面接の質問と回答 - Total 30 questions |
| XML 面接の質問と回答 - Total 25 questions |
| GraphQL 面接の質問と回答 - Total 32 questions |
| Bitcoin 面接の質問と回答 - Total 30 questions |
| Active Directory 面接の質問と回答 - Total 30 questions |
| Microservices 面接の質問と回答 - Total 30 questions |
| Apache Kafka 面接の質問と回答 - Total 38 questions |
| Tableau 面接の質問と回答 - Total 20 questions |
| Adobe AEM 面接の質問と回答 - Total 50 questions |
| Kubernetes 面接の質問と回答 - Total 30 questions |
| OOPs 面接の質問と回答 - Total 30 questions |
| Fashion Designer 面接の質問と回答 - Total 20 questions |
| Desktop Support 面接の質問と回答 - Total 30 questions |
| IAS 面接の質問と回答 - Total 56 questions |
| PHP OOPs 面接の質問と回答 - Total 30 questions |
| Nursing 面接の質問と回答 - Total 40 questions |
| Linked List 面接の質問と回答 - Total 15 questions |
| Dynamic Programming 面接の質問と回答 - Total 30 questions |
| SharePoint 面接の質問と回答 - Total 28 questions |
| CICS 面接の質問と回答 - Total 30 questions |
| Yoga Teachers Training 面接の質問と回答 - Total 30 questions |
| Language in C 面接の質問と回答 - Total 80 questions |
| Behavioral 面接の質問と回答 - Total 29 questions |
| School Teachers 面接の質問と回答 - Total 25 questions |
| Full-Stack Developer 面接の質問と回答 - Total 60 questions |
| Statistics 面接の質問と回答 - Total 30 questions |
| Digital Marketing 面接の質問と回答 - Total 40 questions |
| Apache Spark 面接の質問と回答 - Total 24 questions |
| VISA 面接の質問と回答 - Total 30 questions |
| IIS 面接の質問と回答 - Total 30 questions |
| System Design 面接の質問と回答 - Total 30 questions |
| SEO 面接の質問と回答 - Total 51 questions |
| Google Analytics 面接の質問と回答 - Total 30 questions |
| Cloud Computing 面接の質問と回答 - Total 42 questions |
| BPO 面接の質問と回答 - Total 48 questions |
| ANT 面接の質問と回答 - Total 10 questions |
| Agile Methodology 面接の質問と回答 - Total 30 questions |
| HR Questions 面接の質問と回答 - Total 49 questions |
| REST API 面接の質問と回答 - Total 52 questions |
| Content Writer 面接の質問と回答 - Total 30 questions |
| SAS 面接の質問と回答 - Total 24 questions |
| Control System 面接の質問と回答 - Total 28 questions |
| Mainframe 面接の質問と回答 - Total 20 questions |
| Hadoop 面接の質問と回答 - Total 40 questions |
| Banking 面接の質問と回答 - Total 20 questions |
| Checkpoint 面接の質問と回答 - Total 20 questions |
| Blockchain 面接の質問と回答 - Total 29 questions |
| Technical Support 面接の質問と回答 - Total 30 questions |
| Sales 面接の質問と回答 - Total 30 questions |
| Nature 面接の質問と回答 - Total 20 questions |
| Chemistry 面接の質問と回答 - Total 50 questions |
| Docker 面接の質問と回答 - Total 30 questions |
| SDLC 面接の質問と回答 - Total 75 questions |
| Cryptography 面接の質問と回答 - Total 40 questions |
| RPA 面接の質問と回答 - Total 26 questions |
| Interview Tips 面接の質問と回答 - Total 30 questions |
| College Teachers 面接の質問と回答 - Total 30 questions |
| Blue Prism 面接の質問と回答 - Total 20 questions |
| Memcached 面接の質問と回答 - Total 28 questions |
| GIT 面接の質問と回答 - Total 30 questions |
| Algorithm 面接の質問と回答 - Total 50 questions |
| Business Analyst 面接の質問と回答 - Total 40 questions |
| Splunk 面接の質問と回答 - Total 30 questions |
| DevOps 面接の質問と回答 - Total 45 questions |
| Accounting 面接の質問と回答 - Total 30 questions |
| SSB 面接の質問と回答 - Total 30 questions |
| OSPF 面接の質問と回答 - Total 30 questions |
| Sqoop 面接の質問と回答 - Total 30 questions |
| JSON 面接の質問と回答 - Total 16 questions |
| Accounts Payable 面接の質問と回答 - Total 30 questions |
| Computer Graphics 面接の質問と回答 - Total 25 questions |
| IoT 面接の質問と回答 - Total 30 questions |
| Insurance 面接の質問と回答 - Total 30 questions |
| Scrum Master 面接の質問と回答 - Total 30 questions |
| Express.js 面接の質問と回答 - Total 30 questions |
| Ansible 面接の質問と回答 - Total 30 questions |
| ES6 面接の質問と回答 - Total 30 questions |
| Electron.js 面接の質問と回答 - Total 24 questions |
| RxJS 面接の質問と回答 - Total 29 questions |
| NodeJS 面接の質問と回答 - Total 30 questions |
| ExtJS 面接の質問と回答 - Total 50 questions |
| jQuery 面接の質問と回答 - Total 22 questions |
| Vue.js 面接の質問と回答 - Total 30 questions |
| Svelte.js 面接の質問と回答 - Total 30 questions |
| Shell Scripting 面接の質問と回答 - Total 50 questions |
| Next.js 面接の質問と回答 - Total 30 questions |
| Knockout JS 面接の質問と回答 - Total 25 questions |
| TypeScript 面接の質問と回答 - Total 38 questions |
| PowerShell 面接の質問と回答 - Total 27 questions |
| Terraform 面接の質問と回答 - Total 30 questions |
| JCL 面接の質問と回答 - Total 20 questions |
| JavaScript 面接の質問と回答 - Total 59 questions |
| Ajax 面接の質問と回答 - Total 58 questions |
| Ethical Hacking 面接の質問と回答 - Total 40 questions |
| Cyber Security 面接の質問と回答 - Total 50 questions |
| PII 面接の質問と回答 - Total 30 questions |
| Data Protection Act 面接の質問と回答 - Total 20 questions |
| BGP 面接の質問と回答 - Total 30 questions |
| Ubuntu 面接の質問と回答 - Total 30 questions |
| Linux 面接の質問と回答 - Total 43 questions |
| Unix 面接の質問と回答 - Total 105 questions |
| Weblogic 面接の質問と回答 - Total 30 questions |
| Tomcat 面接の質問と回答 - Total 16 questions |
| Glassfish 面接の質問と回答 - Total 8 questions |
| TestNG 面接の質問と回答 - Total 38 questions |
| Postman 面接の質問と回答 - Total 30 questions |
| SDET 面接の質問と回答 - Total 30 questions |
| Selenium 面接の質問と回答 - Total 40 questions |
| Kali Linux 面接の質問と回答 - Total 29 questions |
| Mobile Testing 面接の質問と回答 - Total 30 questions |
| UiPath 面接の質問と回答 - Total 38 questions |
| Quality Assurance 面接の質問と回答 - Total 56 questions |
| API Testing 面接の質問と回答 - Total 30 questions |
| Appium 面接の質問と回答 - Total 30 questions |
| ETL Testing 面接の質問と回答 - Total 20 questions |
| Cucumber 面接の質問と回答 - Total 30 questions |
| QTP 面接の質問と回答 - Total 44 questions |
| PHP 面接の質問と回答 - Total 27 questions |
| Oracle JET(OJET) 面接の質問と回答 - Total 54 questions |
| Frontend Developer 面接の質問と回答 - Total 30 questions |
| Zend Framework 面接の質問と回答 - Total 24 questions |
| RichFaces 面接の質問と回答 - Total 26 questions |
| HTML 面接の質問と回答 - Total 27 questions |
| Flutter 面接の質問と回答 - Total 25 questions |
| CakePHP 面接の質問と回答 - Total 30 questions |
| React 面接の質問と回答 - Total 40 questions |
| React Native 面接の質問と回答 - Total 26 questions |
| Angular JS 面接の質問と回答 - Total 21 questions |
| Web Developer 面接の質問と回答 - Total 50 questions |
| Angular 8 面接の質問と回答 - Total 32 questions |
| Dojo 面接の質問と回答 - Total 23 questions |
| Symfony 面接の質問と回答 - Total 30 questions |
| GWT 面接の質問と回答 - Total 27 questions |
| CSS 面接の質問と回答 - Total 74 questions |
| Ruby On Rails 面接の質問と回答 - Total 74 questions |
| Yii 面接の質問と回答 - Total 30 questions |
| Angular 面接の質問と回答 - Total 50 questions |