要求从Student类中创建对象后调用计算面积的方法，方法参数为圆形类对象时计算圆形面积，参数为梯形类对象时计算梯形面积。

以下是Java代码示例，实现从Student类中创建对象后调用计算面积的方法，方法参数为圆形类对象时计算圆形面积，参数为梯形类对象时计算梯形面积：

public class Student {
    private int id;
    private String name;
    private int age;

    public Student(int id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public double calculateArea(Shape shape) {
        if (shape instanceof Circle) {
            Circle circle = (Circle) shape;
            return circle.getRadius() * circle.getRadius() * Math.PI;
        } else if (shape instanceof Trapezoid) {
            Trapezoid trapezoid = (Trapezoid) shape;
            return (trapezoid.getTop() + trapezoid.getBottom()) * trapezoid.getHeight() / 2;
        } else {
            return 0;
        }
    }
}

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

class Circle extends Shape {
    private double radius;

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

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }

    @Override
    public double getArea() {
        return radius * radius * Math.PI;
    }
}

class Trapezoid extends Shape {
    private double top;
    private double bottom;
    private double height;

    public Trapezoid(double top, double bottom, double height) {
        this.top = top;
        this.bottom = bottom;
        this.height = height;
    }

    public double getTop() {
        return top;
    }

    public void setTop(double top) {
        this.top = top;
    }

    public double getBottom() {
        return bottom;
    }

    public void setBottom(double bottom) {
        this.bottom = bottom;
    }

    public double getHeight() {
        return height;
    }

    public void setHeight(double height) {
        this.height = height;
    }

    @Override
    public double getArea() {
        return (top + bottom) * height / 2;
    }
}

// 创建Student对象并调用calculateArea方法
Student student = new Student(1, "Tom", 18);
Circle circle = new Circle(5);
Trapezoid trapezoid = new Trapezoid(3, 5, 4);
double circleArea = student.calculateArea(circle);
double trapezoidArea = student.calculateArea(trapezoid);
System.out.println("圆形面积为：" + circleArea);
System.out.println("梯形面积为：" + trapezoidArea);