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Tags
#bloch-effective-java-2ed #java #java-generics
Question
What is the name of the property of arrays that allow us to cast Long[] to Object[], like here? 

// Fails at runtime!
Object[] objectArray = new Long[1];
objectArray[0] = "I don't fit in"; // Throws ArrayStoreException
Answer
arrays are covariant

Tags
#bloch-effective-java-2ed #java #java-generics
Question
What is the name of the property of arrays that allow us to cast Long[] to Object[], like here? 

// Fails at runtime!
Object[] objectArray = new Long[1];
objectArray[0] = "I don't fit in"; // Throws ArrayStoreException
Answer
?

Tags
#bloch-effective-java-2ed #java #java-generics
Question
What is the name of the property of arrays that allow us to cast Long[] to Object[], like here? 

// Fails at runtime!
Object[] objectArray = new Long[1];
objectArray[0] = "I don't fit in"; // Throws ArrayStoreException
Answer
arrays are covariant
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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               
scheduled repetition interval               last repetition or drill

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