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Tags

#bloch-effective-java-2ed #java #java-generics

Question

How to cast raw type Set to typesafe Set using generics?


if (o instanceof Set) { // Raw type
  // here
}

Answer

Use unbounded wildcard type:


if (o instanceof Set) { // Raw type
  Set<?> m = (Set<?>) o; // Wildcard type
  // rest of the code
}

Tags

#bloch-effective-java-2ed #java #java-generics

Question

How to cast raw type Set to typesafe Set using generics?


if (o instanceof Set) { // Raw type
  // here
}

Answer

Use unbounded wildcard type:


if (o instanceof Set) { // Raw type
  Set<?> m = (Set<?>) o; // Wildcard type
  // rest of the code
}

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owner: piotr.wasik - (no access) - Effective Java (Joshua Bloch), 2ed, p114

status	not learned	measured difficulty	37% [default]	last interval [days]
repetition number in this series	0	memorised on		scheduled repetition
scheduled repetition interval		last repetition or drill

No repetitions

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