用Java抽象一个能表示水平等腰梯形的Trapezoid类，测试输出等腰梯形形状

在Java中，我们可以创建一个名为`Trapezoid`的抽象类，它代表一个水平等腰梯形。由于等腰梯形有两个相同的底边，我们还需要两个属性来存储这两个底边的长度，以及两个侧边的斜线长度。为了表示图形，我们将提供一些基本的方法如计算面积、绘制等。这里是一个简单的示例：

import java.util.Scanner;

abstract class Trapezoid {
    private double base1;
    private double base2;
    private double height;
    
    public Trapezoid(double base1, double base2, double height) {
        this.base1 = base1;
        this.base2 = base2;
        this.height = height;
    }
    
    // 抽象方法，子类需要实现
    abstract double getPerimeter();
    
    abstract double calculateArea();

    public void draw() {
        System.out.println("Drawing a trapezoidal shape with base1=" + base1 +
                           ", base2=" + base2 +
                           ", and height=" + height);
    }

    public double getBase1() {
        return base1;
    }

    public double getBase2() {
        return base2;
    }

    public double getHeight() {
        return height;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the length of base1: ");
        double base1 = scanner.nextDouble();
        System.out.print("Enter the length of base2: ");
        double base2 = scanner.nextDouble();
        System.out.print("Enter the height: ");
        double height = scanner.nextDouble();

        try {
            // 创建等腰梯形实例，假设SubTrapezoid是实现了Trapezoid的子类
            SubTrapezoid subTrapezoid = new SubTrapezoid(base1, base2, height);
            System.out.println("Perimeter: " + subTrapezoid.getPerimeter());
            System.out.println("Area: " + subTrapezoid.calculateArea());
            subTrapezoid.draw();
        } catch (Exception e) {
            System.out.println("Error creating trapezoid: " + e.getMessage());
        }
        scanner.close();
    }
}

class SubTrapezoid extends Trapezoid {
    @Override
    double getPerimeter() {
        return base1 + base2 + 2 * Math.sqrt(Math.pow(height / 2, 2) + (base1 - base2) * (base1 - base2) / 4);
    }

    @Override
    double calculateArea() {
        return (base1 + base2) * height / 2;
    }
}

在这个例子中，`SubTrapezoid`类实现了`Trapezoid`的抽象方法，并提供了具体的面积和周长计算。`main`函数用于获取用户输入并创建等腰梯形实例。