Создание таблиц

public enum Operation {
PLUS {double eval(double x, double y){return x + y;}},
MINUS {double eval(double x, double y){return x - y;}},
MULTIPLY {double eval(double x, double y){return x * y;}},
DIVIDE {double eval(double x, double y){return x / y;}};
abstract double eval(double x, double y);
public static void main(String[] args) {
double x = 49.7, y = 0.3;
for (Operation i: Operation.values())
System.out.println(i.eval(x,y));
}
}

public enum Operation {
    PLUS {
        double eval(double x, double y) {
            return x + y;
        }
    },
    MINUS {
        double eval(double x, double y) {
            return x - y;
        }
    },
    MULTIPLY {
        double eval(double x, double y) {
            return x * y;
        }
    },
    DIVIDE {
        double eval(double x, double y) {
            return x / y;
        }
    };
 
    abstract double eval(double x, double y);
 
    public static void main(String[] args) {
        for (int i = 1; i <10 ; i++) {
            for (int j = 1; j < 10; j++) {
                System.out.print(i + " x " + j + " = " + (int)Operation.MULTIPLY.eval(i, j) + "\t");
            }
            System.out.println();
        }
 
    }
}