What does <String, String> mean?

Question

So, I'm sure this is a question about the Nob, but while reading a post in Android programming, I came across a line like this:

List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();

My question is, what does it mean <Map<String, String>>? I tried Googling, but all I get is lists of Java statements.

Answer 1

This is due to the fact that Listand Mapuse generics. So yours Listis a list Mapthat are Mapwith type keys Stringand type valuesString

You can read about generics here.

Answer 2

a Map<type, type> - , . , Map<String, String> . generics. List<Map<String, String>> , , Map, String s

Answer 3

Java Generics. , , . ; generics, .

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Map<String, String>

" Map, String String s." , .

List<Map<String, String>>

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, ; Java . , Java, .

Answer 4

A , .