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When the concatenation of final string literal happen?

JVM concatenates the final string literals during compile time.

For example, final String website = "javapedia." + "net";, the concatenation is handled by JVM during compile time itself.

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System.out.println ("A"=="A");

What is the difference between appending a string to a StringBuilder and concatenating two strings with a + operator? How string concatenation operator (+) works in Java? When the concatenation of final string literal happen? Is Java's SimpleDateFormat thread-safe?

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OOPS Concepts and its implementation in Java 19 Inheritance 29 Java Identifiers 4 JDK, JRE, JVM, JIT 69 Object, Class and Package 44 Variable 9 Local Variables 6 Instance Variables (Non Static Variables) 3 Class Variables (Static Variables) 13 Package 10 Operators 9 Modifiers 29 Data types 10 Methods 39 Access Modifiers 5 Control Statements 14 Constructor 38 Interface 46 Abstract Class 19 Enum 20 Arrays 20 Strings 32 Using String 29 Exception 55 Collections 56 List and its implementations 22 Map and its implementations 39 Set and its implementations 23 Queue and its implementations 4 Regular expressions 3 Design Patterns 75 Generics 20 Casting 5 volatile 13 Java ThreadLocal 10 Java Multithreading 113 Java Multithreading part II 18 final keyword 13 static keyword 16 Java Transactions (JTA) 21 Concurrent collections 55 Java Serialization 36 JDBC 53 JNDI 17 RMI 6 JAXB 10 JMS 45 Servlet Interview Questions 16 JMX 9 log4j 18 Annotations 10 XML 14 Garbage collection 31 Programs 8 JVM 4 Java8 streams 32 JavaFX 6 Autosys Interview questions 21 The Java Virtual Machine: How and What Is It Used For? Java 11 10 Java 12 5 Top Errors You Should Avoid when Studying Programming Java 17 1 JPMS 6 Java Record Keyword 4 MapStruct Java Interview questions

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