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What are best practices for working with wildcards (?)?

How do you test code that uses encapsulation?

encapsulation Java testing object-oriented programming unit testing

What are alternatives to equals and hashCode and how do they compare?

alternatives equals hashCode compareTo Comparator Java comparison methods identity hashing

How do you test code that uses immutability?

immutability unit testing PHP testing immutable objects

How has enhanced for-each loop changed in recent Java versions?

Enhanced for-each loop Java 5 Streams API lambda expressions Java Collections Framework

What are best practices for working with arrays?

arrays best practices java performance readability data management

How does Strings and string pool behave in multithreaded code?

Java Strings String Pool Multithreading Immutable Strings Java Concurrency

How does primitive types impact performance or memory usage?

java primitive types performance memory usage int float boolean char efficiency

What are common mistakes developers make with assertions?

assertions common mistakes error handling development best practices

When should you prefer text blocks and when should you avoid it?

text blocks multiline strings Java 13 code readability escape sequences

How do you use switch expressions with a simple code example?

switch expressions Java programming Java code example

What is var (local variable type inference) in Java?

Java var local variable type inference Java 10 programming coding

How does objects behave in multithreaded code?

multithreading objects concurrency synchronization race condition

How does classes impact performance or memory usage?

Java classes performance impact memory usage object-oriented programming memory allocation garbage collection

What are common mistakes developers make with portability concerns?

portability development mistakes cross-platform issues software compatibility

How do you use performance tradeoffs with JNI with a simple code example?

JNI Java Native Interface performance tradeoffs optimization C C++ interoperation

What is safety and sandboxing in Java?

safety sandboxing Java security Java applets access control

How do you test code that uses struct layouts and VarHandle?

struct layout VarHandle Java code testing MemoryLayout MemorySegment

How has Panama MemorySegment/Linker changed in recent Java versions?

Panama MemorySegment Java Linker native linking Java Performance Memory Management

How does calling C libraries behave in multithreaded code?

C libraries Java Native Interface JNI multithreading thread safety memory management