用java定义一个图形Shape类，包含三个抽象方法：求周长calPerimeter()、返回图形类型getType()以及求面积getArea()；再分别定义一个三角形类、圆形类、矩形类继承Shape类，并实现相应的抽象方法；最后编写一个测试类，分别创建相应类的实例对象，测试方法

好的，以下是我为您准备的代码：

// Shape类
abstract class Shape {
    public abstract double calPerimeter();
    public abstract String getType();
    public abstract double getArea();
}

// Triangle类
class Triangle extends Shape {
    private double a, b, c;

    public Triangle(double a, double b, double c) {
        this.a = a;
        this.b = b;
        this.c = c;
    }

    public double calPerimeter() {
        return a + b + c;
    }

    public String getType() {
        return "Triangle";
    }

    public double getArea() {
        double p = (a + b + c) / 2;
        return Math.sqrt(p * (p - a) * (p - b) * (p - c));
    }
}

// Circle类
class Circle extends Shape {
    private double r;

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

    public double calPerimeter() {
        return 2 * Math.PI * r;
    }

    public String getType() {
        return "Circle";
    }

    public double getArea() {
        return Math.PI * r * r;
    }
}

// Rectangle类
class Rectangle extends Shape {
    private double width, height;

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

    public double calPerimeter() {
        return 2 * (width + height);
    }

    public String getType() {
        return "Rectangle";
    }

    public double getArea() {
        return width * height;
    }
}

// 测试类
public class Test {
    public static void main(String[] args) {
        Shape triangle = new Triangle(3, 4, 5);
        Shape circle = new Circle(5);
        Shape rectangle = new Rectangle(3, 4);

        System.out.println(triangle.getType() + " perimeter: " + triangle.calPerimeter() + ", area: " + triangle.getArea());
        System.out.println(circle.getType() + " perimeter: " + circle.calPerimeter() + ", area: " + circle.getArea());
        System.out.println(rectangle.getType() + " perimeter: " + rectangle.calPerimeter() + ", area: " + rectangle.getArea());
    }
}

希望这份代码能够满足您的需求。