A default constructor is provided by the compiler if the class has none, 5. Throwable class override this method from Object class. The JIT compiler then compiles the bytecode of the invoked method into native machine code, compiling it “just in time” to execute. Constructor chaining can be achieved in two ways: Q28. Interview. What is the Difference Between Extends and Implements in Java? Below are a few of the characteristics of Map interface: In Java, the collection is a framework that acts as an architecture for storing and manipulating a group of objects. Some of the important Spring Framework modules are: Beans are objects that form the backbone of a Spring application. Optum uses rich data, advanced analytics to improve the performance of the modern healthcare ecosystem. What is EJB in Java and How to Implement it? Listed below are the five stages in the servlet lifecycle:• Servlet is destroyed• Servlet is initialized• Servlet is loaded• Service the request• Servlet is instantiated, • Session Management API• Cookies• User Authentication• URL Rewriting• HTML Hidden Field, The types of JDBC drivers are:• Thin driver (fully java driver)• JDBC-ODBC bridge driver• Native-API driver (partially java driver)• Network Protocol driver (fully java driver), The methods for connecting to a database in java are:• Creating statement• Executing queries• Registering the driver class• Creating connection• Closing connection, Three types of statements are supported by JDBC• Statement• CallableStatement• PreparedStatement, The different modules of the spring framework are:• Spring DAO• Spring JDBC• Spring ORM• Spring Context• Spring Web Module• Spring AOP• Spring MVC, • @Autowired• @Resource• @PreDestroy• @Qualifier• @Required• @PostConstruct, 5 Types of Scopes defined in Spring beans are as follows:• Singleton:• Prototype• Request• Session• Global-session, Important Spring annotations are:• @Controller• @RequestMapping• @ResponseBody• @PathVariable• @Autowired• @Qualifier• @Service• @Scope• @Configuration• @ComponentScan• @Bean, There are 2 types of transaction management which spring support:• Programmatic transaction management• Declarative transaction management, By using these 5 keywords we can handle the Java exceptions• catch• finally• try• throws• throw, The important methods of Java Exception Class are as follows:• Synchronized Throwable getCause()• String getMessage()• void printStackTrace()• String getLocalizedMessage()• String toString(), Java provides 4 types of garbage:• CMS Garbage Collector• Serial Garbage Collector• Parallel Garbage Collector• G1 Garbage Collector, The two ways to create a thread are:• Implement the Runnable interface.• Extend the Thread. If a child class inherits the property from multiple classes is known as multiple inheritance. 100+ Java Interview Questions You Must Prepare In 2020, Top MVC Interview Questions and Answers You Need to Know, Top 50 Java Collections Interview Questions You Need to Know, Top 50 JSP Interview Questions You Need to Know, Top 50 Hibernate Interview Questions That Are A Must, Explain public static void main(String args) in Java. How To Create Library Management System Project in Java? The process took 4+ weeks. Used to call the default constructor of the same class, 2. Everything You Need To Know About Session In Java? The course is designed to give you a head start into Java programming and train you for both core and advanced Java concepts along with various Java frameworks like Hibernate & Spring. @Configuration, @ComponentScan and @Bean – for java based configurations. What is Conditional Operator in Java and how to write it? What is the difference between equals() and == in Java? In case you attended any Java interview recently, or have additional questions beyond what we covered, we encourage you to post them in our QnA Forum. These are known as wrapper classes because they “wrap” the primitive data type into an object of that class. In this article, we will discuss the frequently asked Core Java interview questions. Got a question for us? Secured because data is not exposed in URL bar. First, the job description was not accurate. Hibernate implicitly provides transaction management, in fact, most of the queries can’t be executed outside transaction. Similarly, hibernate configurations are flexible and can be done from XML configuration file as well as programmatically. Also, the code within the packages can be imported by other classes and reused. Executed outside transaction create global exception handler methods in the section below we., Map and set in Java and how to check Leap year bytecode in Java as response, usually sending! 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