java3.30作业

1.

package com.company.niuweiyong;
public class asdasdasd {

    abstract class Geometric {
        String color;
        boolean filled;
        public Geometric() {
        }
        public Geometric(String color, boolean filled) {
            this.color = color;
            this.filled = filled;
        }
        abstract double getArea();
        abstract double getPerimeter();
        @Override
        public String toString() {
            return "Geometric [color=" + color + ", filled=" + filled + ", getArea()=" + getArea() + ", getPerimeter()="
                    + getPerimeter() + ", getClass()=" + getClass() + ", hashCode()=" + hashCode() + ", toString()="
                    + super.toString() + "]";
        }

    }
}
2.

package com.company.niuweiyong;;

public class Circle extends Geometric {
    private static final double pI=3.14;

    double radius;//名为radius的double属性表示半径。
    //无参构造方法。
    public Circle() {

    }


    //一个能创建指定radius的圆的构造方法
    public Circle(double radius) {
        this.radius = radius;
    }
    public void setRadius(double radius) {
        this.radius = radius;
    }
    //radius的访问器方法
    public double getRadius() {
        return radius;
    }
    @Override
    double getArea() {

        return pI * radius *radius;
    }

    @Override
    double getPerimeter() {

        return 2 * pI *radius;
    }
    @Override
    public String toString() {
        return "Circle [radius=" + radius + ", getArea()=" + getArea() + ", getPerimeter()=" + getPerimeter() + "]";
    }
}
3.

package com.company.niuweiyong;;

public class Rectangle extends Geometric {

    private double side1;
    private double side2;
    public Rectangle() {
    }
    public Rectangle(double side1, double side2) {
        super();
        this.side1 = side1;
        this.side2 = side2;
    }
    public double getSide1() {
        return side1;
    }
    public void setSide1(double side1) {
        this.side1 = side1;
    }
    public double getSide2() {
        return side2;
    }
    public void setSide2(double side2) {
        this.side2 = side2;
    }
    @Override
    double getArea() {
        // TODO Auto-generated method stub
        return side1 *side2;
    }
    @Override
    double getPerimeter() {
        // TODO Auto-generated method stub
        return 2 *(side1 + side2);
    }
    @Override
    public String toString() {
        return "Rectangle [side1=" + side1 + ", side2=" + side2 + ", getArea()=" + getArea() + ", getPerimeter()="
                + getPerimeter() + "]";
    }


}
4.

package com.company.niuweiyong;;
import org.apache.jasper.tagplugins.jstl.core.If;
public  class Triangle extends Geometric {
    int t;
    private double side1;
    private double side2;
    private double side3;
    public Triangle() {
        // TODO Auto-generated constructor stub
    }
    public Triangle(double side1, double side2, double side3) {
        super();
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
    }
    @Override
    double getArea() {
        double p=((side1+side2+side3)/2);;
        return Math.sqrt(p*(p-side1)*(p-side2)*(p-side3)) ;
    }
    @Override
    double getPerimeter() {
        return side1+side2+side3;
    }
    boolean kk(double side1, double side2, double side3) {
        if ((side1 + side2) > side3 && (side1 + side3) > side2 && (side2 + side3) > side1) {
            return true;
        } else {
            return false;
        }
    }
    @Override
    public String toString() {
        //判断最小值
        double temp;
        if (side1 >= side2) {
            temp = side1;
            side1 = side2;
            side2 = temp;
        }
        if (side1 >= side3) {
            temp = side1;
            side1 = side3;
            side3 = temp;
        }
        return " kk [side1=" + side1 + "] ";
    }
}
5.

package com.company.niuweiyong;
import java.util.Scanner;
public class dasdsadas{
    private static Scanner sc;

    public static void main(String[] args) {
        sc =new Scanner(System.in);
        double radius=sc.nextDouble();
        Circle c1 =new Circle(radius);
        System.out.println("圆的面积"+c1.getArea());
        System.out.println("圆的周长" +c1.getPerimeter());
        System.out.println(c1.toString());

        double side1 =sc.nextDouble();
        double side2 =sc.nextDouble();
        Rectangle rectangle=new Rectangle(side1,side2);
        System.out.println("矩形的面积"+rectangle.getArea());
        System.out.println("矩形的周长" +rectangle.getPerimeter());
        System.out.println(rectangle.toString());

        double side3 =sc.nextDouble();
        double side4 =sc.nextDouble();
        double side5 =sc.nextDouble();
        Triangle triangle =new Triangle(side3,side4,side5);
        if (triangle.kk(side3, side4, side5)) {
            System.out.println("三角形的面积"+triangle.getArea());
            System.out.println("三角形的周长" +triangle.getPerimeter());
            System.out.println("三边最小值"+triangle.toString());
        } else {

            System.out.println("不能构成三角行");

        }

    }
}