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Error while compiling nested classes

Deepak GoelJan 6 2021

Hello
I downloaded the Tetris example from web
Java-Tetris-Game-master.zip (8.32 KB)
I am using Java 15 and am having compilation error: "Cannot find the nested class" (Shape.Tetrominoe)
Any idea what I can do?
Thank You
Deepak

Error:
import Shape.Tetrominoe;
^
Board.java:28: error: cannot find symbol
private Tetrominoe[] board;
^
symbol: class Tetrominoe
location: class Board
Board.java:52: error: cannot find symbol
private Tetrominoe shapeAt(int x, int y) {
^
symbol: class Tetrominoe
location: class Board

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Added on Jan 6 2021
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