Java Tutorial

Java is a high-level, object-oriented programming language developed by Sun Microsystems (now owned by Oracle Corporation) in the mid-1990s. It was designed to be simple, platform-independent, and secure, making it suitable for a wide range of applications, from desktop software to web development and enterprise systems.

One of the key features of Java is its "write once, run anywhere" principle, which means that Java code can be compiled into bytecode that can run on any Java Virtual Machine (JVM), regardless of the underlying operating system. This portability has contributed to Java's widespread adoption and popularity.

Java follows an object-oriented programming (OOP) paradigm, which emphasizes the organization of code into reusable objects that interact with each other. This approach promotes code reusability, modularity, and maintainability.


Java tutorial for beginners

Java comes with a vast standard library, providing pre-built classes and methods that developers can leverage to simplify common programming tasks. The standard library includes modules for input/output operations, networking, graphical user interfaces, database connectivity, and more.

Furthermore, Java has a strong emphasis on security, with built-in features such as automatic memory management (garbage collection) and strict access control mechanisms. These features help prevent common programming errors and enhance the overall stability and security of Java applications.

Java has been widely adopted in various domains, including enterprise software development, Android app development, web development (Java Servlets, JavaServer Pages, and JavaServer Faces), scientific and numerical computing, and more. It has a large and active community of developers, which contributes to the availability of libraries, frameworks, and resources to support Java development.

Our primary objective is to develop a comprehensive and user-friendly resource that effectively empowers Java developers, regardless of their skill level. We highly value your feedback as it plays a crucial role in assisting us in accomplishing this goal. We encourage you to reach out to us without hesitation to share any suggestions or ideas you may have. By working together, we can consistently enhance our platform and deliver a valuable learning experience for the entire Java development community.


  Java Tutorial | Learn Java Programming
  1. What is Java
  2. Why Choose Java
  3. Java is Platform neutral
  1. What is Java virtual machine?
  2. Java "Hello World" Program

  Java Fundamentals
  1. Java Path and Java ClassPath
  2. Java Data Types
  3. Type Casting in Java
  1. Java Boxing and Unboxing
  2. Access modifiers in java
  3. Java Enum
  4. what is the meaning of public static void main(string[] args)
  5. Formatting Output with printf() in Java

  Java Control Structures
  1. Java if-else statement
  2. Java for loop
  3. How to while loop and do..while loop in Java
  1. How to Java Switch Statement
  2. Java break and continue statement
  3. Exception Handling in Java
  4. How to Throw Exceptions in Java
  5. Java Programming for Beginners

  Java Collections
  1. Java ArrayList
  2. HashMap in Java
  3. Hashtable in Java
  1. TreeMap in Java
  2. Java LinkedList Operations
  3. Vector in Java
  4. Java HashSet Class
  5. Treeset in Java
  6. Pair Class in Java
  7. Java Record Class

  Java String Class
  1. How to Get the Length of a String in Java
  2. Java String charAt() Method
  3. String indexOf() method in Java
  1. Java String replace()
  2. Java String contains()
  3. String Comparison in Java
  4. Java String substring()
  5. Java String concat() Method
  6. Java String split() method
  7. Convert String to int in Java
  8. Java StringBuilder Class
  9. StringTokenizer in Java
  10. How to convert int to String in Java?

  Java File Class
  1. How to create a file in Java
  2. Java InputStreamReader Class
  3. Java OutPutStreamWriter Class
  1. Java BufferedReader Class
  2. Java BufferedWriter Class
  3. Java FileReader Class
  4. Java FileWriter Class
  5. RandomAccessFile in Java
  6. Java Reading/Writing Objects
  7. Java Scanner class
  8. List all files in a folder in Java

  Learn Java Programming
  1. Java Program to Check Leap Year
  2. Java Program to Check if a String/Number is Palindrome
  3. Java Program to Check Whether a Number is Prime or Not
  1. How to Connect MySQL Database in Java
  2. Can you overload main() method in Java?
  3. Why there are no global variables in Java?

  Java Network Programming
  1. How to find your IP address and computer/host name
  2. Reading Content in Java from URL
  3. Java Socket Programming
  1. Multithreaded Socket Programming in Java?

  Java Errors and Exceptions
  1. Reached end of file while parsing
  2. Unreachable statement error in Java
  3. Int Cannot Be Dereferenced Error - Java
  1. How to fix java.lang.classcastexception
  2. How to fix java.util.NoSuchElementException
  3. How to fix "illegal start of expression" error
  4. How to resolve java.net.SocketException: Connection reset
  5. Non-static variable cannot be referenced from a static context
  6. Error: Could not find or load main class in Java
  7. How to Handle OutOfMemoryError in Java
  8. How to resolve java.net.SocketTimeoutException
  9. How to handle the ArithmeticException in Java?

  Java Interview Questions
  1. Java Interview Questions-Core Faq - 1
  2. Java Interview Questions-Core Faq - 2
  3. Java Interview Questions-Core Faq - 3
  1. What are the major features of Java programming
  2. Difference between Java and JavaScript?
  3. What is the difference between JDK and JRE?
  4. What gives Java its 'write once and run anywhere' nature?
  5. What is JVM and is it platform independent?
  6. What is Just-In-Time (JIT) compiler?
  7. What is the garbage collector in Java?
  8. What is NullPointerException in Java
  9. Difference between Stack and Heap memory in Java
  10. How to set the maximum memory usage for JVM?
  11. What is numeric promotion?
  12. Why do we need Generic Types in Java?
  13. What does it mean to be static in Java?
  14. What are final variables in Java?
  15. How Do Annotations Work in Java?
  16. How do I use the ternary operator in Java?
  17. What is instanceof keyword in Java?
  18. How ClassLoader Works in Java?
  19. What are fail-safe and fail-fast Iterators in Java
  20. What are method references in Java?
  21. "Cannot Find Symbol" compile error
  22. Difference between system.gc() and runtime.gc()
  23. How to convert TimeStamp to Date in Java?
  24. Does garbage collection guarantee that a program will not run out of memory?
  25. How setting an Object to null help Garbage Collection?
  26. How do objects become eligible for garbage collection?
  27. How to calculate date difference in Java
  28. Difference between Path and Classpath in Java
  29. Is Java "pass-by-reference" or "pass-by-value"?
  30. Difference between static and nonstatic methods java
  31. Why Java does not support pointers?
  32. What is a package in Java?
  33. What are wrapper classes in Java?
  34. What is singleton class in Java?
  35. Difference between Java Local Variable, Instance Variable and a Class Variable?
  36. Can a top level class be private or protected in Java
  37. Are Polymorphism , Overloading and Overriding similar concepts?
  38. How to Use Locks in Java
  39. Why Multiple Inheritance is Not Supported in Java
  40. Why Java is not a pure Object Oriented language?
  41. Static class in Java
  42. Difference between Abstract class and Interface in Java
  43. Why do I need to override the equals and hashCode methods in Java?
  44. Why does Java not support operator overloading?
  45. What’s meant by anonymous class in Java?
  46. Static Vs Dynamic class loading in Java
  47. Why am I getting a NoClassDefFoundError in Java?
  48. How to Generate Random Number in Java
  49. What's the meaning of System.out.println in Java?
  50. What is the purpose of Runtime and System class in Java?
  51. The finally Block in Java
  52. Difference between final, finally and finalize
  53. What is try-with-resources in java?
  54. What is a stacktrace?
  55. Why String is immutable in Java ?
  56. What are different ways to create a string object in Java?
  57. Difference between String and StringBuffer/StringBuilder in Java
  58. Difference between creating String as new() and literal | Java
  59. How do I convert String to Date object in Java?
  60. How do I create a Java string from the contents of a file?
  61. What actually causes a StackOverflow error in Java?
  62. Why is char[] preferred over String for storage of password in Java
  63. What is I/O Filter and how do I use it in Java?
  64. Serialization and Deserialization in Java
  65. Understanding transient variables in Java
  66. What is Externalizable in Java?
  67. What is the purpose of serialization/deserialization in Java?
  68. What is the Difference between byte stream and Character streams
  69. How to append text to an existing file in Java
  70. How to convert InputStream object to a String in Java
  71. What is the difference between Reader and InputStream in Java
  72. Introduction to Java threads
  73. What is synchronization Java?
  74. Static synchronization Vs non static synchronization in Java
  75. Deadlock in Java with Examples
  76. What is Daemon thread in Java
  77. Difference between implements Runnable and extends Thread in Java
  78. What is the volatile keyword in Java
  79. What are the basic interfaces of Java Collections Framework
  80. What are the differences between ArrayList and Vector in Java
  81. What is the difference between ArrayList and LinkedList?
  82. What is the difference between List and Set in Java
  83. Difference between HashSet and HashMap in Java
  84. Difference between HashMap and Hashtable in Java?
  85. How does the hashCode() method of java works?
  86. Difference between capacity() and size() of Vector in Java
  87. What is a Java ClassNotFoundException?
  88. How to fix java.lang.UnsupportedClassVersionError