Java判断两个三角形是否

Question

Object类是一切类的基类，查阅object类文档，完成对三角形全等的判断（复写object类中的equals（）方法），并在主函数中实现两种三角形是否全等的比较。

Answer 1

实现思路是通过分别判断两个三角形的最长边、最短边以及边长平均值是否相等来判定两个三角形是否全等。

package com.example.impl;

public class Triangle {
    private double edge1;
    private double edge2;
    private double edge3;

    public Triangle(double edge1, double edge2, double edge3){
        this.edge1 = edge1;
        this.edge2 = edge2;
        this.edge3 = edge3;
    }

    public boolean equals(Triangle triangle){
        return this.getMinEdge()==triangle.getMinEdge() && this.getMaxEdge()==triangle.getMaxEdge() && this.getAverageEdge()==triangle.getAverageEdge();
    }

    public double getMinEdge(){
        double minEdge = this.edge1;
        if(this.edge2<minEdge){
            minEdge = this.edge2;
            if(this.edge3<minEdge){
                minEdge = this.edge3;
            }
        }else if(this.edge3<minEdge){
            minEdge = this.edge3;
        }
        return minEdge;
    }

    public double getMaxEdge(){
        double maxEdge = this.edge1;
        if(this.edge2>maxEdge){
            maxEdge = this.edge2;
            if(this.edge3>maxEdge){
                maxEdge = this.edge3;
            }
        }else if(this.edge3>maxEdge){
            maxEdge = this.edge3;
        }
        return maxEdge;
    }

    public double getAverageEdge(){
        return (this.edge1+this.edge2+this.edge3)/2;
    }

    public double getEdge1() {
        return edge1;
    }
    public void setEdge1(double edge1) {
        this.edge1 = edge1;
    }
    public double getEdge2() {
        return edge2;
    }
    public void setEdge2(double edge2) {
        this.edge2 = edge2;
    }
    public double getEdge3() {
        return edge3;
    }
    public void setEdge3(double edge3) {
        this.edge3 = edge3;
    }

    public static void main(String[] args){
        Triangle triangle1 = new Triangle(3.0,4.0,5.0);
        Triangle triangle2 = new Triangle(4.0,5.0,3.0);
        Triangle triangle3 = new Triangle(4.0,4.0,4.0);
        System.out.println(triangle1.equals(triangle2));
        System.out.println(triangle1.equals(triangle3));
        System.out.println(triangle2.equals(triangle3));
    }
}