Java and Spring Learning Materials

• Java and Spring Learning Materials
  • Chapter 1 : Fundamentals of Java
  • Chapter 2: Intermediate Java
  • Chapter 3: Advanced Java
  • Chapter 4: Java Build Tools
  • Chapter 5: Java EE
  • Chapter 6: Clean Code and Design Patterns
  • Chapter 7: Java Spring Framework and Spring Boot

Chapter 1 : Fundamentals of Java

1.1 Primitives

1.1.1 https://www.baeldung.com/java-primitives

1.1.2 https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html

1.2 Conditionals

1.2.1. Basics

https://www.baeldung.com/java-control-structures

1.2.2 Some conventions to follow

https://www.baeldung.com/java-using-not-in-if-conditions

**1.2.3 Switch Case **

https://www.baeldung.com/java-switch

1.3 Loops

• https://www.baeldung.com/java-loops

1.4 OOP

1.4.1. Class, Interfaces, Abstract Class, Access Modifiers

• https://www.baeldung.com/java-oop
• https://www.baeldung.com/java-concrete-class
• https://www.codejava.net/java-core/the-java-language/9-rules-about-constructors-in-java
• https://www.codejava.net/java-core/the-java-language/everything-you-need-to-know-about-interfaces-in-java
• https://java2blog.com/difference-between-abstract-class-and-interface-in-java
• https://www.baeldung.com/java-access-modifiers
• https://www.codejava.net/java-core/the-java-language/java-access-modifiers-examples-public-protected-private-and-default

1.4.2 Encapsulation

• https://www.codejava.net/java-core/the-java-language/what-is-encapsulation-in-java-the-what-why-and-how

1.4.3 Abstraction

• https://www.codejava.net/java-core/the-java-language/what-is-abstraction-in-java-the-why-and-the-truth

• https://www.javatpoint.com/abstract-class-in-java#:~:text=in%20Java%20first.-,Abstraction%20in%20Java,text%20and%20send%20the%20message.

1.4.4 Inheritance

• https://www.codejava.net/java-core/the-java-language/what-is-inheritance-in-java-the-what-why-and-how
• https://www.codejava.net/java-core/the-java-language/12-rules-and-examples-about-inheritance-in-java
• https://www.baeldung.com/java-inheritance-composition

1.4.5 Polymorphism

• https://www.codejava.net/java-core/the-java-language/what-is-polymorphism-in-java-the-what-how-and-why

1.4.6 Overloading & Overriding

• https://www.codejava.net/java-core/the-java-language/what-is-overloading-in-java-and-examples
• https://www.codejava.net/java-core/the-java-language/12-rules-of-overriding-in-java-you-should-know
• https://www.codejava.net/java-core/the-java-language/differences-between-overriding-and-overloading

1.4.7 Miscellaneous

• https://www.baeldung.com/java-this
• https://www.baeldung.com/java-type-casting
• https://www.baeldung.com/java-static
• https://java2blog.com/final-keyword-java-example/
• https://java2blog.com/static-block-java/
• https://java2blog.com/java-static-import-example/
• Java Variables Passing Examples - Pass-by-value or Pass-by-reference?
• https://www.baeldung.com/java-wrapper-classes
• https://www.javatpoint.com/java-bean
• https://stackoverflow.com/a/3295517/10197771
• https://www.baeldung.com/java-pojo-class
• https://www.baeldung.com/a-guide-to-java-enums
• https://www.baeldung.com/java-tostring
• https://www.baeldung.com/java-equals-hashcode-contracts
• https://www.baeldung.com/java-bigdecimal-biginteger
• https://www.baeldung.com/java-serialization
• https://dzone.com/articles/what-is-serialization-everything-about-java-serial
• https://stackoverflow.com/a/37632/10197771

1.5 String

• https://www.techiedelight.com/difference-between-string-stringbuilder-java/#:~:text=A%20String%20is%20immutable%20in,created%20in%20the%20string%20pool.
• Check String API Section from here: https://www.baeldung.com/java-string
• https://java2blog.com/core-java-tutorial-for-beginners-experienced/#Chapter_11_String_Handling

1.6 Exception Handling

• https://www.baeldung.com/java-exceptions
• https://www.baeldung.com/java-checked-unchecked-exceptions
• https://java2blog.com/difference-between-throw-and-throws-in-java/
• https://www.baeldung.com/java-new-custom-exception

Chapter 2: Intermediate Java

2.1 Collections

• What is Collections Framework: https://www.codejava.net/java-core/collections/what-is-java-collections-framework

Fig: Collections Framework Hierarchy, Source: https://www.javatpoint.com/collections-in-java

• List:
  • https://www.codejava.net/java-core/collections/java-list-collection-tutorial-and-examples
  • https://www.codejava.net/java-core/collections/sorting-list-collections-examples
  • https://www.codejava.net/java-core/collections/sorting-a-list-by-multiple-attributes-example
  • Converting Iterator to List
  • Java – Get Random Item/Element From a List
  • Partition a List in Java
  • Removing all nulls from a List in Java
  • Removing all duplicates from a List in Java
  • Removing all Nulls from a List in Java
  • Check If Two Lists are Equal in Java
  • How to Find an Element in a List with Java (popular)
  • Java List UnsupportedOperationException
  • Copy a List to Another List in Java
  • Remove All Occurrences of a Specific Value from a List
  • Add Multiple Items to an Java ArrayList
  • Remove the First Element from a List
  • Ways to Iterate Over a List in Java
  • Intersection of Two Lists in Java
  • How to Count Duplicate Elements in Arraylist
  • Finding the Differences Between Two Lists in Java
  • Reversing a Linked List in Java
  • Assert Two Lists for Equality Ignoring Order in Java
• Set:
  • https://www.codejava.net/java-core/collections/java-set-collection-tutorial-and-examples
  • https://www.baeldung.com/java-tree-set
  • https://www.baeldung.com/java-hashset
• Map:
  • https://www.baeldung.com/java-hashmap
  • https://www.baeldung.com/java-hashmap-advanced
  • https://www.baeldung.com/java-treemap
  • https://www.baeldung.com/java-treemap-vs-hashmap
  • How to Store Duplicate Keys in a Map in Java?
  • Initialize a HashMap in Java **
  • Merging Two Maps with Java 8
  • Sort a HashMap in Java
  • Comparing Two HashMaps in Java
  • Using the Map.Entry Java Class
  • Working With Maps Using Streams **
  • Using the Map.Entry Java Class
  • Iterate over a Map in Java **
• Miscellaneous:
  • Converting between an Array and a List in Java
  • Converting Between an Array and a Set in Java
  • Converting between a List and a Set in Java
  • Convert a Map to an Array, List or Set in Java
  • How to Convert List to Map in Java (popular)
  • Map to String Conversion in Java
  • Arrays.asList vs new ArrayList(Arrays.asList())
  • Collecting Stream Elements into a List in Java
  • The Difference Between Collection.stream().forEach() and Collection.forEach()
  • A Guide to Iterator in Java
  • https://www.baeldung.com/java-collections-complexity

2.2 Generics

• https://www.baeldung.com/java-generics
• http://tutorials.jenkov.com/java-generics/wildcards.html (Optional)

2.3 Streams and Lambdas

• https://www.oracle.com/webfolder/technetwork/tutorials/obe/java/Lambda-QuickStart/index.html
• https://www.jrebel.com/blog/java-streams-in-java-8#:~:text=Java%20streams%20enable%20functional%2Dstyle,where%20you%20can%20store%20elements.
• https://reflectoring.io/comprehensive-guide-to-java-streams/
• https://www.capitalone.com/tech/software-engineering/java-streams-explained-simple-example/
• Video Tutorials from java brains - https://www.youtube.com/watch?v=gpIUfj3KaOc&list=PLqq-6Pq4lTTa9YGfyhyW2CqdtW9RtY-I3&ab_channel=JavaBrains
• https://github.com/winterbe/java8-tutorial

2.4 Optional

• https://github.com/winterbe/java8-tutorial#optionals
• https://www.baeldung.com/java-optional

2.5 Annotations

• https://jenkov.com/tutorials/java-reflection/index.html
• https://www.baeldung.com/java-reflection
• https://docs.oracle.com/javase/tutorial/java/annotations/index.html
• https://www.baeldung.com/java-default-annotations
• Custom Annotation: https://www.youtube.com/watch?v=DkZr7_c9ry8
• https://reflectoring.io/java-annotation-processing/
• https://github.com/winterbe/java8-tutorial#annotations
• https://www.baeldung.com/java-default-annotations
• @Deprecated annotation examples
• @Override annotation examples
• @SuppressWarnings annotation examples
• Annotations under the hood

2.6 Date API

• https://github.com/winterbe/java8-tutorial#date-api

2.7 Command Line Tools for Java

• https://codejava.net/java-core/tools

Chapter 3: Advanced Java

3.1 Concurrency

• All 14 Parts - https://foojay.io/today/java-thread-programming-part-1/
• Synchronized - https://www.baeldung.com/java-synchronized
• Volatile - https://jenkov.com/tutorials/java-concurrency/volatile.html
• Completable Future - https://www.baeldung.com/java-completablefuture
• Oracle Docs - https://docs.oracle.com/javase/tutorial/essential/concurrency/index.html
• Synchronization and Locks - https://web.mit.edu/6.005/www/fa15/classes/23-locks/
• Reentrant Lock - https://www.geeksforgeeks.org/reentrantreadwritelock-class-in-java/
• Executor Service - https://jenkov.com/tutorials/java-util-concurrent/executorservice.html
• Thread Pool - https://www.geeksforgeeks.org/thread-pools-java/
• Thread Pool Executor - https://www.digitalocean.com/community/tutorials/threadpoolexecutor-java-thread-pool-example-executorservice
• Fork Join Framework - https://www.educative.io/answers/what-is-the-use-of-fork-join-framework-in-java

3.2 Features of Java 8 and later

• Java 8 Features: https://www.javacodegeeks.com/java-8-features-tutorial.html
• Java 9 Features: https://www.baeldung.com/new-java-9
• Java 10 Features: https://www.baeldung.com/java-10-overview
• Java 11 Features: https://www.baeldung.com/java-11-new-features
• Java 12 Features: https://www.baeldung.com/java-12-new-features
• Java 13 Features: https://www.baeldung.com/java-13-new-features
• Java 14 Features: https://www.baeldung.com/java-14-new-features
• Java 15 Features: https://www.baeldung.com/java-15-new
• Java 16 Features: https://blogs.oracle.com/java-platform-group/the-arrival-of-java-16
• Java 17 Features: https://www.techgeeknext.com/java/java17-features
• Java 18 Features: https://www.happycoders.eu/java/java-18-features/

Miscellaneous

• Understanding Object Ordering in Java with Comparable and Comparator
• Understanding Collections and Thread Safety in Java
• 18 Java Collections and Generics Best Practices
• Generics with extends and super Wildcards and the Get and Put Principle
• Generics with Subtyping and the Substitution Principle
• Differences between static and non-static stuffs in Java
• What is Upcasting and Downcasting in Java
• https://jenkov.com/tutorials/java-reflection/index.html
• https://www.baeldung.com/java-reflection

Chapter 4: Java Build Tools

• Maven - Video Tutorial (Java Brains) : https://www.youtube.com/watch?v=al7bRZzz4oU&list=PL92E89440B7BFD0F6&index=1&ab_channel=JavaBrainsJavaBrainsVerified
• Gradle - Video Tutorial (Linkedin Learning) : https://www.linkedin.com/learning/gradle-for-java-developers

Chapter 5: Java EE

5.1 Servlet

• What is Apache tomcat? : https://www.youtube.com/watch?v=kkQOm02kep0&ab_channel=KKJavaTutorialsKKJavaTutorials
• What is Servlet? : https://www.javatpoint.com/servlet-tutorial
• Lifecycle of a Servlet : https://www.javatpoint.com/life-cycle-of-a-servlet
• How Servlet Works? : https://www.javatpoint.com/how-servlet-works
• Servlet Context : https://www.javatpoint.com/servletcontext
• Servlet Filter : https://www.javatpoint.com/servlet-filter
• What is war file? : https://www.javatpoint.com/war-file
• Introduction to Servlet : Video Tutorial - https://www.youtube.com/watch?v=7TOmdDJc14s
• Intro to servlets - https://www.baeldung.com/intro-to-servlets
• Oracle Servlet Documentation : https://docs.oracle.com/javaee/6/tutorial/doc/bnafd.html
• Servlet MVC : https://www.baeldung.com/mvc-servlet-jsp

Chapter 6: Clean Code and Design Patterns

5.1 SOLID Principles

• https://medium.com/backticks-tildes/the-s-o-l-i-d-principles-in-pictures-b34ce2f1e898

Chapter 7: Java Spring Framework and Spring Boot

7.1 Overview of Spring Framework

• https://docs.spring.io/spring-framework/docs/5.0.0.RC2/spring-framework-reference/overview.html#:~:text=The%20Spring%20Framework%20consists%20of,shown%20in%20the%20following%20diagram.
• https://www.baeldung.com/spring-why-to-choose

7.2 Beans, Inversion of Control, Dependency Injection

• https://codejava.net/frameworks/spring/understanding-the-core-of-spring-framework
• https://www.baeldung.com/spring-bean
• https://www.baeldung.com/inversion-control-and-dependency-injection-in-spring
• https://www.baeldung.com/spring-autowire
• https://www.baeldung.com/spring-bean-annotations
• https://stackoverflow.com/a/34174782/10197771
• https://www.baeldung.com/spring-annotations-resource-inject-autowire
• https://stackoverflow.com/a/9106576/10197771
• https://www.baeldung.com/circular-dependencies-in-spring
• https://www.baeldung.com/spring-unsatisfied-dependency
• https://www.baeldung.com/spring-bean-scopes

7.3 Spring MVC, Spring Boot

• Spring MVC : https://www.baeldung.com/spring-mvc-tutorial
• Dispatcher Servlet : https://www.baeldung.com/spring-dispatcherservlet
• https://stackoverflow.com/a/2769523/10197771
• Spring vs Spring Boot : https://www.baeldung.com/spring-vs-spring-boot
• Spring Boot : https://spring.io/guides/gs/spring-boot/
• https://codejava.net/frameworks/spring-boot/spring-vs-spring-boot
• https://medium.com/edureka/what-is-dependency-injection-5006b53af782
• https://www.baeldung.com/spring-requestmapping
• https://www.baeldung.com/spring-request-param
• https://www.baeldung.com/spring-controller-vs-restcontroller
• https://www.baeldung.com/spring-mvc-view-resolver-tutorial
• https://spring.io/guides/gs/serving-web-content/
• https://www.baeldung.com/building-a-restful-web-service-with-spring-and-java-based-configuration
• Extra - Video Course from Java Brains : https://www.youtube.com/watch?v=YXlSkWq04jk&list=PLqq-6Pq4lTTbx8p2oCgcAQGQyqN8XeA1x&index=4&ab_channel=JavaBrainsJavaBrainsVerified

7.4 Properties, Profiles, Value Annotations

• https://www.javadevjournal.com/spring/spring-profiles/
• https://www.baeldung.com/spring-profiles
• https://www.baeldung.com/spring-value-annotation

7.5 Spring JDBC, Persistence, JPA

• https://www.baeldung.com/spring-jdbc-jdbctemplate
• https://www.javatpoint.com/jpa-tutorial
• https://www.baeldung.com/the-persistence-layer-with-spring-and-jpa
• https://www.baeldung.com/the-persistence-layer-with-spring-data-jpa

7.6 Spring Security

• https://www.youtube.com/watch?v=sm-8qfMWEV8&list=PLqq-6Pq4lTTYTEooakHchTGglSvkZAjnE&ab_channel=LinuxTexLinuxTex

7.7 Miscellaneous

• https://www.baeldung.com/spring-template-engines
• https://www.baeldung.com/jackson-object-mapper-tutorial