#JavaTraps - Twitter Hashtag

8 months ago

Java Traps #19 forEach() ≠ for loop forEach() can’t control flow like a normal loop, you can’t use break, continue, or return to stop iteration early. Follow for more such content. #Java #JavaTraps #SoftwareEngineering #TechTwitter

NidhiDevNotes's tweet photo. Java Traps #19

forEach() ≠ for loop

forEach() can’t control flow like a normal loop, you can’t use break, continue, or return to stop iteration early.

Follow for more such content.
#Java #JavaTraps #SoftwareEngineering #TechTwitter https://t.co/vTIxnR6kiY

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Nidhi Tiwari @NidhiDevNotes

9 months ago

Java Traps #15 “Immutable” classes that aren’t actually immutable Your class can be final and still be mutable if it exposes or stores mutable objects incorrectly. final protects references, not data. Defensive copies = real immutability #Java #JavaTraps #SoftwareEngineering #TechTwitter

NidhiDevNotes's tweet photo. Java Traps #15

“Immutable” classes that aren’t actually immutable

Your class can be final and still be mutable if it exposes or stores mutable objects incorrectly.

final protects references, not data.
Defensive copies = real immutability
#Java #JavaTraps #SoftwareEngineering #TechTwitter

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Nidhi Tiwari @NidhiDevNotes

9 months ago

Java Traps #14 Synchronized on the wrong object synchronized only works if all threads lock the same object. If you lock on new Object(), every thread gets its own lock. So everyone thinks they’re synchronized but no one actually is. #Java #JavaTraps #TechTwitter #SoftwareEngineering

NidhiDevNotes's tweet photo. Java Traps #14

Synchronized on the wrong object

synchronized only works if all threads lock the same object. If you lock on new Object(), every thread gets its own lock. So everyone thinks they’re synchronized but no one actually is.
#Java #JavaTraps #TechTwitter #SoftwareEngineering

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Nidhi Tiwari @NidhiDevNotes

9 months ago

Java Traps #13 Static methods belong to the class, not the object so polymorphism doesn’t apply. Follow for more if this helped. #Java #JavaTraps #SoftwareEngineering #TechTwitter

NidhiDevNotes's tweet photo. Java Traps #13

Static methods belong to the class, not the object so polymorphism doesn’t apply.

Follow for more if this helped.
#Java #JavaTraps #SoftwareEngineering #TechTwitter https://t.co/kaX8fuyZQt

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Nidhi Tiwari @NidhiDevNotes

9 months ago

Java Traps #12 Fields Don’t Override In Java, fields are chosen at compile time using the reference type, while methods are chosen at runtime using the object type. Follow for more if this helped. #Java #JavaTraps #TechTwitter #SoftwareEngineering

NidhiDevNotes's tweet photo. Java Traps #12

Fields Don’t Override

In Java, fields are chosen at compile time using the reference type, while methods are chosen at runtime using the object type.

Follow for more if this helped.
#Java #JavaTraps #TechTwitter #SoftwareEngineering https://t.co/u2h27XzK5f

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Nidhi Tiwari @NidhiDevNotes

9 months ago

Seen this happen? Got burned by a “clever” optimisation? Drop your own stream war story below. Let’s make each other smarter. #Java #Programming #DevTips #SoftwareEngineering #Coding #Debugging #JavaTraps

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Nidhi Tiwari @NidhiDevNotes

9 months ago

Java Traps #7 Concurrent Modification The for-each loop is secretly using an iterator. When you modify the list directly, the loop and the collection go out of sync. Java fails fast and throws an exception to stop corrupt or unpredictable behaviour early. #Java #JavaTraps #SoftwareEngineering #TechTwitter

NidhiDevNotes's tweet photo. Java Traps #7

Concurrent Modification

The for-each loop is secretly using an iterator. When you modify the list directly, the loop and the collection go out of sync. Java fails fast and throws an exception to stop corrupt or unpredictable behaviour early.
#Java #JavaTraps #SoftwareEngineering #TechTwitter

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Nidhi Tiwari @NidhiDevNotes

9 months ago

Java Traps #6 Floating Point Comparison Java can’t store some decimal numbers exactly, so math with doubles isn’t perfectly accurate. That’s why you compare them using a small tolerance instead of ==. #Java #JavaTraps #SoftwareEngineering