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Exam 1z0-804 topic 1 question 33 discussion

Actual exam question from Oracle's 1z0-804
Question #: 33
Topic #: 1
[All 1z0-804 Questions]

Which concept allows generic collections to interoperate with java code that defines collections that use raw types?

  • A. bytecode manipulation
  • B. casting
  • C. autoboxing
  • D. auto-unboxing
  • E. type erasure
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Suggested Answer: E 🗳️
The type erasure of its leftmost bound, or type Object if no bound was specified.
Examples:
type parameters type erasure

List<String> List -
Map.Entry<String,Long> Map.Entry
<T extends Cloneable & Comparable<T>> Cloneable
<T extends Object & Comparable<T>> Object
<T> T[] toArray(T[] a) Object[] toArray(Object[] a)
The type erasure process can be imagined as a translation from generic Java source code back into regular Java code. In reality the compiler is more efficient and translates directly to Java byte code. But the byte code created is equivalent to the non-generic Java code.
by [deleted] at April 4, 2025, 11:28 a.m.

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