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Tags
#bloch-effective-java-2ed #java #java-generics
Question
What is the name of the property of parametrized List that causes compilation error (unlike in arrays)? 

// Won't compile!
List<Object> ol = new ArrayList<Long>(); // Incompatible types
ol.add("I don't fit in");
Answer
generics are invariant

Tags
#bloch-effective-java-2ed #java #java-generics
Question
What is the name of the property of parametrized List that causes compilation error (unlike in arrays)? 

// Won't compile!
List<Object> ol = new ArrayList<Long>(); // Incompatible types
ol.add("I don't fit in");
Answer
?

Tags
#bloch-effective-java-2ed #java #java-generics
Question
What is the name of the property of parametrized List that causes compilation error (unlike in arrays)? 

// Won't compile!
List<Object> ol = new ArrayList<Long>(); // Incompatible types
ol.add("I don't fit in");
Answer
generics are invariant
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pdfs

  • owner: piotr.wasik - (no access) - Effective Java (Joshua Bloch), 2ed, p119
  • owner: Jack-Rustier - (no access) - Joshua Bloch-Effective Java-Addison-Wesley (2017).pdf, p147

Summary

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
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