10+ Oracle Cerner Software Developer Interview Questions and Answers for Freshers

A hardworker puts in more effort, while a smartworker works efficiently and effectively.

• A hardworker may spend more time on a task, while a smartworker finds ways to complete it faster.

• A hardworker may rely on brute force, while a smartworker uses their skills and knowledge to solve problems.

• A hardworker may struggle with prioritization, while a smartworker knows how to focus on the most important tasks.

• A hardworker may burn out quickly, while a smartworker maintains a sustai...read more

Order of catch blocks in a try block in Java

• Specific catch blocks should come before general catch blocks

• If general catch block comes before specific catch block, it will result in a compile-time error

• If multiple catch blocks are present, only the first matching catch block will be executed

Code for connecting a Java application to a database

• Import the JDBC driver for the specific database

• Create a connection object using the DriverManager class

• Create a statement object to execute SQL queries

• Execute the query and retrieve the results

• Close the connection and release resources

Private keyword restricts access to member functions within the class while final keyword prevents overriding of functions.

• Private keyword is used to hide the implementation details of a class from the user.

• Final keyword is used to prevent the user from overriding a function in a subclass.

• Using private and final keywords together can ensure that the implementation details of a class are not modified by the user.

Garbage collection is an automatic memory management process that frees up memory occupied by objects that are no longer in use.

• Garbage collection is used in programming languages like Java, C#, and Python.

• It helps prevent memory leaks and reduces the risk of crashes due to memory exhaustion.

• Garbage collection works by identifying objects that are no longer in use and freeing up the memory they occupy.

• There are different algorithms for garbage collection, such as mark-and-swe...read more

finally is a keyword used in try-catch block, finalize is a method in Object class, and final is a keyword used for declaring constants.

• finally is used to execute a block of code after try-catch block

• finalize is called by garbage collector before destroying an object

• final is used to declare a constant variable or to make a class uninheritable

Abstract class is a class with some implementation while Interface is a contract with no implementation.

• Abstract class can have constructors while Interface cannot

• Abstract class can have non-abstract methods while Interface cannot

• A class can implement multiple interfaces but can only inherit from one abstract class

• Abstract class is used when there is a need for common functionality among related classes while Interface is used when there is a need for unrelated classes to imp...read more

JSON stands for JavaScript Object Notation, a lightweight data interchange format.

• JSON is used to transmit data between a server and a web application, as an alternative to XML.

• It is easy to read and write for humans and easy to parse and generate for machines.

• JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C family of languages.

• Example: {"name":"John", "age":30, "city":"New York"}

Inheritance types in Java

• Java supports single and multiple inheritance through classes and interfaces respectively

• Single inheritance is when a class extends only one parent class

• Multiple inheritance is when a class implements multiple interfaces

• Java also supports hierarchical inheritance where multiple classes extend a single parent class

• Java does not support multiple inheritance through classes to avoid the diamond problem

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reuse and promotes code organization.

• The existing class is called the parent or superclass, and the new class is called the child or subclass.

• The child class inherits all the properties and methods of the parent class and can also add its own unique properties and methods.

• Inheritance can be single, multiple, or multilevel...read more