What is java pseudo generics?

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Description

1. Generics in Java are pseudo-generics. This generic implementation method is called type erasure, and generics implemented based on this method are called pseudo-generics.

2. Because Java generics only play a role in the compilation phase, they play a role of checking when writing code.

When the code runs, there are no generics inside it.

Example

List L1 = new ArrayList (); List L2 = new ArrayList (); System.out.println (l1.getClass () = = l2.getClass ()); / / true

The result is that the Class of both true,List and List in jvm is List.class, that is, the generic information is erased.

What are the collection classes in Java? the collections in Java are divided into four main categories:

1. List list: ordered and repeatable

2. Queue queue: orderly and repeatable

3. Set collection: non-repeatable

4. Map mapping: unordered, key unique, value not unique.

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