java写定义形状类Shape,包含方法CalculatedArea() 2.定义形状类的子类:矩形Rectangle、平行四边形Parallelogram、圆形Circle和三角形triangle 3.定义运算类Operation,可以计算所有形状的面积

好的，以下是Java代码实现：

Shape类：

public abstract class Shape {
    public abstract double calculatedArea();
}

Rectangle类：

public class Rectangle extends Shape {
    private double length;
    private double width;

    public Rectangle(double length, double width) {
        this.length = length;
        this.width = width;
    }

    public double calculatedArea() {
        return length * width;
    }
}

Parallelogram类：

public class Parallelogram extends Shape {
    private double base;
    private double height;

    public Parallelogram(double base, double height) {
        this.base = base;
        this.height = height;
    }

    public double calculatedArea() {
        return base * height;
    }
}

Circle类：

public class Circle extends Shape {
    private double radius;

    public Circle(double radius) {
        this.radius = radius;
    }

    public double calculatedArea() {
        return Math.PI * radius * radius;
    }
}

Triangle类：

public class Triangle extends Shape {
    private double base;
    private double height;

    public Triangle(double base, double height) {
        this.base = base;
        this.height = height;
    }

    public double calculatedArea() {
        return 0.5 * base * height;
    }
}

Operation类：

public class Operation {
    public static void main(String[] args) {
        Shape rectangle = new Rectangle(4, 5);
        System.out.println("The area of rectangle is: " + rectangle.calculatedArea());

        Shape parallelogram = new Parallelogram(6, 7);
        System.out.println("The area of parallelogram is: " + parallelogram.calculatedArea());

        Shape circle = new Circle(3);
        System.out.println("The area of circle is: " + circle.calculatedArea());

        Shape triangle = new Triangle(8, 9);
        System.out.println("The area of triangle is: " + triangle.calculatedArea());
    }
}

运行结果：

The area of rectangle is: 20.0
The area of parallelogram is: 42.0
The area of circle is: 28.274333882308138
The area of triangle is: 36.0

以上代码实现了定义形状类Shape，包含方法CalculatedArea()，以及定义形状类的子类：矩形Rectangle、平行四边形Parallelogram、圆形Circle和三角形Triangle，同时定义了运算类Operation，可以计算所有形状的面积。