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is not abstract and does not override の原因と直し方

抽象メソッドの実装漏れ。

 1  abstract class Shape {
 2      abstract double area();
 3  }
 4  public class Main extends Shape {
 5      _____________________________
                      ^
 6      public static void main(String[] args) {
 7          System.out.println(new Main().area());
 8      }
 9  }