This tutorial series focuses on core Java - "Back to Basics". We're going to cover Java Collections and Java IO:
1. Core Java Language Concepts
- Java – Try with Resources
- Guide to the Synchronized Keyword in Java
- A Guide to Java 9 Modularity
- Class Loaders in Java
- Using Java Assertions
- Inheritance and Composition (Is-a vs Has-a relationship) in Java
- Guide to the Volatile Keyword in Java
- Wrapper Classes in Java
- Quick Guide to java.lang.System
- Object Type Casting in Java
- A Guide to the finalize Method in Java
- Concrete Class in Java
- Control Structures in Java
- What is a POJO Class?
- Using the Not Operator in If Conditions in Java
- Comparing Objects in Java
2. Core Java
- Binary Numbers in Java
- Java 8 – Powerful Comparison with Lambdas
- Java – Random Long, Float, Integer and Double
- Java Timer
- How to Round a Number to N Decimal Places in Java (popular)
- Guide to UUID in Java
- Java - Comparing getPath(), getAbsolutePath(), and getCanonicalPath() in Java
- ClassNotFoundException vs NoClassDefFoundError
- Iterating over Enum Values in Java
- The StackOverflowError in Java
- Converting a Stack Trace to a String in Java
- Period and Duration in Java
- RegEx for matching Date Pattern in Java
- The “final” Keyword in Java
- Exception Handling in Java
- Create a Custom Exception in Java
- Immutable Objects in Java
- Why String is Immutable in Java?
- The Modulo Operator in Java
- Java Switch Statement
- Java toString() Method
- Anonymous Classes in Java
- Convert Time to Milliseconds in Java
- Comparing Dates in Java
- Java Copy Constructor
- Command-Line Arguments in Java
- The XOR Operator in Java
- Checked and Unchecked Exceptions in Java
- Validations for Enum Types
- Overflow and Underflow in Java
- Comparing Long Values in Java
- Case-Insensitive String Matching in Java
- Java 14 Record Keyword
- Number Formatting in Java
5. Java Streams
6. Java IO
7. Advanced Java
- Composition, Aggregation, and Association in Java
- The Basics of Java Security
- Working with Network Interfaces in Java
- Convert Hex to ASCII in Java
- A Guide To UDP In Java
- How to Get a Name of a Method Being Executed
- Changing Annotation Parameters At Runtime
- How to get all Dates Between Two Dates?
- Guide to Escaping Characters in Java RegExps
- Introduction to Java Serialization
- Call Methods at Runtime Using Java Reflection
- Dynamic Proxies in Java
- Guide to Java Clock Class
- A Guide to the ResourceBundle
- Weak References in Java
- Sending Emails with Java
- Practical Java Examples of the Big O Notation
- Guide to Java Instrumentation
- Stack Memory and Heap Space in Java
- Setting the Java Version in Maven (popular)
- Hashing a Password in Java
- Different Ways to Capture Java Heap Dumps
- How to Replace Many if Statements in Java
- Understanding Memory Leaks in Java
- Java equals() and hashCode() Contracts
- Generic Constructors in Java
- Java Optional as Return Type
- Guide to System.gc()
- Generating Random Numbers in a Range in Java (popular)
- Convert Character Array to String in Java
- A Guide to System.exit()
- Java Scanner hasNext() vs. hasNextLine()
- Converting Java Date to OffsetDateTime
- Generating Random Dates in Java
- Adding Shutdown Hooks for JVM Applications
8. Tracking Java Development
There we go - the "Back to Basics" Java series, covering basic operations with collections and IO.
Java bottom
Hey Eugen. when we use new operator to create a String object.
i.e String obj1=new String(“abc”);
It will create object in heap , but is it create an object in String pool also or copy the value in string pool.
Please elaborate the process.
Thanks
Deepak
Hey Deepak. Simply put, when you instantiate the String object via the constructor, you’re creating a new object on the heap. When you’re using the String literal, you’re referencing it in the String pool. That distinction will determine the equality of these references.
Of course there are a lot of solid tutorials online that go into the details of how that works, so I’d definitely recommend doing a search and reading through some of these – it’s worth taking a bit of time to get the basics nailed down.
Hope it helps. Cheers,
Eugen.
See Example 3.10.5-1. String Literals in Java language specification. Literal strings within the same class (§8) in the same package (§7) represent references to the same String object (§4.3.1). Literal strings within different classes in the same package represent references to the same String object. Literal strings within different classes in different packages likewise represent references to the same String object. Strings computed by constant expressions (§15.28) are computed at compile time and then treated as if they were literals. Strings computed by concatenation at run time are newly created and therefore distinct. The result of explicitly interning a computed… Read more »