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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      abstract double perimeter();
 4  }
 5  public class Main extends Shape {
 6      double area() { return 4.0; }
 7      __________________________________
                         ^
 8      public static void main(String[] args) {
 9          System.out.println(new Main().area());
10      }
11  }