The Value can be obtained by using a Key. Map* : stores the Map in key-value mode.
Set: stored in a SetThe contents are unique and unordered.List: stores repeated values, which are sorted by Index.This thing is called a "Backing Field." This field is not visible to the person encoding it, but is automatically applied to getters and setters, so it is named the "Backing Field." In Kotlin, it is equivalent to a variable inside each var. In addition to this, there is something called field. Getter/setter functions are located below the variables declared by var Getter/setter functions have special keywords get and set There are some formatting differences from Java:
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