利用java语言实现 编写一个代表三角形的类。其中,三条边为三角形的属性,并封装有求三角形的面积和周长的方法。分别针对三条边为3,4,5和7,8,9的两个三角形进行测试。

Triangle.java:

public class Triangle {
    private double side1;
    private double side2;
    private double side3;
    
    public Triangle(double side1, double side2, double side3) {
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
    }
    
    public double getPerimeter() {
        return side1 + side2 + side3;
    }
    
    public double getArea() {
        double p = (side1 + side2 + side3) / 2;
        return Math.sqrt(p * (p - side1) * (p - side2) * (p - side3));
    }
}

Main.java:

public class Main {
    public static void main(String[] args) {
        Triangle triangle1 = new Triangle(3, 4, 5);
        System.out.println("Triangle1 perimeter: " + triangle1.getPerimeter());
        System.out.println("Triangle1 area: " + triangle1.getArea());
        
        Triangle triangle2 = new Triangle(7, 8, 9);
        System.out.println("Triangle2 perimeter: " + triangle2.getPerimeter());
        System.out.println("Triangle2 area: " + triangle2.getArea());
    }
}

Output:

Triangle1 perimeter: 12.0
Triangle1 area: 6.0
Triangle2 perimeter: 24.0
Triangle2 area: 26.832815729997478