MindMap Gallery Java common interview questions
This is a mind map about common Java interview questions, which are very beneficial for candidates. Can help candidates better prepare for interviews, understand industry needs, improve skill levels and enhance competitiveness.
Edited at 2024-02-14 23:16:28This infographic, created using EdrawMax, outlines the pivotal moments in African American history from 1619 to the present. It highlights significant events such as emancipation, key civil rights legislation, and notable achievements that have shaped the social and political landscape. The timeline serves as a visual representation of the struggle for equality and justice, emphasizing the resilience and contributions of African Americans throughout history.
This infographic, designed with EdrawMax, presents a detailed timeline of the evolution of voting rights and citizenship in the U.S. from 1870 to the present. It highlights key legislative milestones, court decisions, and societal changes that have expanded or challenged voting access. The timeline underscores the ongoing struggle for equality and the continuous efforts to secure voting rights for all citizens, reflecting the dynamic nature of democracy in America.
This infographic, created using EdrawMax, highlights the rich cultural heritage and outstanding contributions of African Americans. It covers key areas such as STEM innovations, literature and thought, global influence of music and arts, and historical preservation. The document showcases influential figures and institutions that have played pivotal roles in shaping science, medicine, literature, and public memory, underscoring the integral role of African American contributions to society.
This infographic, created using EdrawMax, outlines the pivotal moments in African American history from 1619 to the present. It highlights significant events such as emancipation, key civil rights legislation, and notable achievements that have shaped the social and political landscape. The timeline serves as a visual representation of the struggle for equality and justice, emphasizing the resilience and contributions of African Americans throughout history.
This infographic, designed with EdrawMax, presents a detailed timeline of the evolution of voting rights and citizenship in the U.S. from 1870 to the present. It highlights key legislative milestones, court decisions, and societal changes that have expanded or challenged voting access. The timeline underscores the ongoing struggle for equality and the continuous efforts to secure voting rights for all citizens, reflecting the dynamic nature of democracy in America.
This infographic, created using EdrawMax, highlights the rich cultural heritage and outstanding contributions of African Americans. It covers key areas such as STEM innovations, literature and thought, global influence of music and arts, and historical preservation. The document showcases influential figures and institutions that have played pivotal roles in shaping science, medicine, literature, and public memory, underscoring the integral role of African American contributions to society.
Java common interview questions
Java basics
The difference between object-oriented and process-oriented
Process-oriented is a process-centered programming idea
Advantages: Streamlined, easy to understand and implement
Disadvantages: difficult to deal with complex systems, difficult to reuse and maintain
Object-oriented is an object-centered programming idea
Advantages: easy to deal with complex systems, easy to reuse and maintain
Disadvantages: Difficult to understand and implement
Features of Java
simplicity
Simple syntax, easy to learn and use
object-oriented
Encapsulation, inheritance, polymorphism
platform independence
Runs cross-platform, write once, run anywhere
safety
Strong type checking to avoid illegal access
Robustness
Automatic garbage collection to avoid memory leaks
Java syntax
Variables and data types
Basic data types
Integer, floating point, character, Boolean
Reference data type
Class, interface, array
operator
arithmetic operators
Addition, subtraction, multiplication, division, modulo
Relational operators
Greater than, less than, equal to, not equal to
Logical Operators
AND, OR, NOT, XOR
control structure
Conditional statements
if, else, else if
loop statement
for, while, do while
Java object-oriented
classes and objects
Class definition
Properties and methods
Creation and use of objects
new keyword, access properties and methods
encapsulation
Hide implementation details and provide a public interface
inherit
Subclasses inherit the properties and methods of parent classes
Polymorphism
The same method shows different behaviors in different objects
Java Collections
collection framework
List, Set, Map
Collection implementation
ArrayList, LinkedList, HashSet, TreeSet, HashMap, TreeMap
Java exception handling
Anomaly classification
Runtime exception, non-runtime exception
Exception handling
try, catch, finally
Java multithreading
Thread concept
Thread is the smallest unit of program execution
Thread status
new, ready, running, blocked, dead
Thread synchronization
synchronized, volatile, ReentrantLock
JavaIO
File operations
File, FileInputStream, FileOutputStream
Stream operations
InputStream, OutputStream, Reader, Writer
Java network programming
Socket programming
ServerSocket, Socket
URLs and URIs
URL, URI, URLConnection
Java database programming
JDBC
Connect to the database, execute SQL statements, and process result sets
JavaWeb
Servlet
Servlet life cycle, request and response
JSP
JSP syntax, JSP tags, JSTL
Java framework
Spring
IoC, AOP, Spring MVC
Hibernate
ORM, Hibernate configuration, Hibernate query
MyBatis
MyBatis configuration, MyBatis query
Java design patterns
Singleton pattern
Hungry Man Style, Lazy Man Style
Factory pattern
Simple factory, factory method, abstract factory
Observer pattern
observer, observed, event
strategy pattern
policy, context, client
decorator pattern
decorator, decorator, client
adapter mode
adapter, adaptee, client
proxy mode
Agent, proxy, client
Java performance optimization
Performance analysis tools
JProfiler, YourKit, VisualVM
Performance optimization strategies
Reduce object creation, use thread pools, use cache, reduce database access