用Java 编写一个三角形类，要求能够计算三角形的面积和周长。从键盘输入一个三角形的3条边的长度，并用这3条边创建一个三角形对象，输出此三角形对象的面积和周长。

import java.util.Scanner;

public class Triangle {
    private double a;
    private double b;
    private double c;

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

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

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

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入三角形的边长a：");
        double a = scanner.nextDouble();
        System.out.print("请输入三角形的边长b：");
        double b = scanner.nextDouble();
        System.out.print("请输入三角形的边长c：");
        double c = scanner.nextDouble();

        Triangle triangle = new Triangle(a, b, c);
        System.out.println("三角形的面积为：" + triangle.getArea());
        System.out.println("三角形的周长为：" + triangle.getPerimeter());
    }
}