复习考试题库，代码编写

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复习考试题库，代码编写
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// PerimeterInterface.java
public interface PerimeterInterface {
public abstract double getPerimeter();
}

// AreaInterface.java
public interface AreaInterface {
public abstract double getArea();
}

// Shape.java
public abstract class Shape implements PerimeterInterface, AreaInterface {
public static void getInfo(Shape shape) {
System.out.println("Perimeter: " + shape.getPerimeter());
System.out.println("Area: " + shape.getArea());
}
}

// Point.java
public class Point extends Shape {
private double x;
private double y;

public Point(double x, double y) {
    this.x = x;
    this.y = y;
}

@Override
public double getPerimeter() {
    return 0.0;
}

@Override
public double getArea() {
    return 0.0;
}
}

// Line.java
public class Line extends Shape {
private Point start;
private Point end;

public Line(Point start, Point end) {
    this.start = start;
    this.end = end;
}

@Override
public double getPerimeter() {
    return start.getPerimeter() + end.getPerimeter();
}

@Override
public double getArea() {
    return 0.0;
}
}

// Circle.java
public class Circle extends Shape {
private Point center;
private double radius;

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

@Override
public double getPerimeter() {
    return 2 * Math.PI * radius;
}

@Override
public double getArea() {
    return Math.PI * Math.pow(radius, 2);
}
}

// RightTriangle.java
public class RightTriangle extends Shape {
private Point a;
private Point b;
private Point c;

public RightTriangle(Point a, Point b, Point c) {
    this.a = a;
    this.b = b;
    this.c = c;
}

@Override
public double getPerimeter() {
    double sideA = Math.sqrt(Math.pow((b.getX() - a.getX()), 2) + Math.pow((b.getY() - a.getY()), 2));
    double sideB = Math.sqrt(Math.pow((c.getX() - b.getX()), 2) + Math.pow((c.getY() - b.getY()), 2));
    double sideC = Math.sqrt(Math.pow((a.getX() - c.getX()), 2) + Math.pow((a.getY() - c.getY()), 2));
    return sideA + sideB + sideC;
}

@Override
public double getArea() {
    double sideA = Math.sqrt(Math.pow((b.getX() - a.getX()), 2) + Math.pow((b.getY() - a.getY()), 2));
    double sideB = Math.sqrt(Math.pow((c.getX() - b.getX()), 2) + Math.pow((c.getY() - b.getY()), 2));
    return (sideA * sideB) / 2;
}
}

// Main.java
public class Main {
public static void main(String[] args) {
Point p = new Point(0, 0);
Line l = new Line(new Point(0, 0), new Point(3, 4));
Circle c = new Circle(new Point(0, 0), 5);
RightTriangle r = new RightTriangle(new Point(0, 0), new Point(3, 0), new Point(0, 4));

    Shape.getInfo(p);
    Shape.getInfo(l);
    Shape.getInfo(c);
    Shape.getInfo(r);
}
}



abstract class Shapes {        //定义抽象类 Shapes
    abstract public double area();      //周长
    abstract public double square();    //面积
}

class Triangle extends Shapes {          //继承 Shapes，定义三角型
    private double a, b, c;

    public Triangle(double a, double b, double c) {
        this.a = a; 
        this.b = b;
        this.c = c;    
    }
    public double square()  {
        double p = (a + b +c) / 2;
        return Math.sqrt(p * (p - a) * (p- b) * (p- c));
    }
    public double area()  {
        double cir = (a + b +c);
        return cir;
    }
    public String toString() {
        return "三角形：边长"+a+","+b+","+c;
    }
}

class Rectangle extends Shapes {  //定义矩形
    private double width, height;//长，宽
    public Rectangle(double j, double k) {
        width = j; height = k;
    }
    public double area() {
        double Rectangle =(width + height)*2;
        return Rectangle;
    }
    public String toString() {
        return "矩形：宽 "+width+" 高 "+height;
    }
    public double square() {
        double Rectangle =width* height;
        return Rectangle;
    }
}

class Circle extends Shapes {   //定义圆
    private double r;
    public Circle(double r) {
        this.r = r;
    }
    public double area() {
        return 3.14 * 2 * r;
    }
    public double square() {
        return 3.14 * r * r;
    }
    public String toString() {
        return "圆：半径= "+ r;
    }   
}