确定三角形类型的程序中If语句工作不正常

Question

我有一个任务，要编写一个程序，该程序使用triangleType方法，我必须编写该方法，从用户那里获取三个int输入并输出三角形类型。在该方法中，我首先需要按升序对整数排序，以便我需要使用的比较能够正常工作。我知道我正确地完成了代码中的排序部分，因为我甚至在开始尝试确定三角形类型之前就对其进行了测试。我需要使用这些比较来找到三角形类型：“如果A B

package trianglemethod;

import javax.swing.JOptionPane;


public class TriangleMethod
{


    public static void main(String[] args)
    {
        String wordaA, wordbB, wordcC, answer;

        do 
        {
           System.out.println("Please enter all 3 side lengths of the triangle in any order.");
           wordaA = JOptionPane.showInputDialog("Enter side 1:");
           wordbB = JOptionPane.showInputDialog("Enter side 2:");
           wordcC = JOptionPane.showInputDialog("Enter side 3:");
           int aA = Integer.parseInt(wordaA);
           int bB = Integer.parseInt(wordbB);
           int cC = Integer.parseInt(wordcC);
           triangleType(aA,bB,cC);
           System.out.println("Would you like to enter another triangle?");
           answer = JOptionPane.showInputDialog("Would you like to enter another triangle?");
        } while (answer.equalsIgnoreCase("yes"));

    }

    static void triangleType(int aA, int bB, int cC) {
        int a=0, b=0, c=0;

        if (aA > bB && aA > cC)
        {
            if (bB > cC)
            {
              a = cC;
              b = bB;
              c = aA;
            }
            else if (cC > bB)
            {
              a = bB;
              b = cC;
              c = aA;
            }
        }
        if (bB > aA && bB > cC)
        {
            if (aA > cC)
            {
              a = cC;
              b = aA;
              c = bB;
            }
            else if (cC > aA)
            {
              a = aA;
              b = cC;
              c = bB;
            }
        }
        if (cC > aA && cC > bB)
        {
            if (aA > bB)
            {
              a = bB;
              b = aA;
              c = cC;
            }
            else if (bB > aA)
            {
              a = aA;
              b = bB;
              c = cC;
            }
        }

        if (a+b<=c)
        {
            JOptionPane.showMessageDialog(null,"Invalid Triangle");
        } if (a==c) {
               JOptionPane.showMessageDialog(null,"Triangle is Equilateral"); 
        } if (a==b || b==c){
                JOptionPane.showMessageDialog(null, "Triangle is Isosceles");
        } 
        else {
            JOptionPane.showMessageDialog(null,"Triangle is Scalene");
        }    
    }
}

Answer 1

实际上有两个问题。

1. Let's say a=5, b=5, and c=5. The way your code is working right now it checks:

   if (a==c)
   

   if (a==b || b==c)
   

   if(aA>=bB && aA>=cC){
       a = aA;
       if(bB >= cC){
           b = bB;
           c = cC;
       } else {
           b = cC;
           c = bB;
       }
   } else if (bB >= aA  && bB >= cC){
       a = bB;
       if(aA >= cC){
           b = aA;
           c = cC;
       } else {
           b = cC;
           a = aA;
       }
   } else {
       a = cC;
       if(cC >= aA){
           b = cC;
           c = aA;
       } else {
           b = aA;
           c = cC;
       }
   }
   

Answer 2

我很困惑，你为什么不能

        if (a == b && b == c) {
            JOptionPane.showMessageDialog(null,"Triangle is Equilateral");
        } else if ((a == b && a != c) || (a == c && a != b) || (b == c && b != a)) {
            JOptionPane.showMessageDialog(null, "Triangle is Isosceles");
        } else if (a != b && a != c && b != c){
            JOptionPane.showMessageDialog(null,"Triangle is Scalene");
        } else {
            JOptionPane.showMessageDialog(null,"Invalid Triangle");
        }

Answer 3

这里有三个不同的if语句，分别进行计算。相反，从问题的描述来看，听起来您需要一个带有多个条件分支的if语句（即，else if子句）：

if (a+b<=c)
{
    JOptionPane.showMessageDialog(null,"Invalid Triangle");
} else if (a==c) {
       JOptionPane.showMessageDialog(null,"Triangle is Equilateral"); 
} else if (a==b || b==c){
        JOptionPane.showMessageDialog(null, "Triangle is Isosceles");
} else {
    JOptionPane.showMessageDialog(null,"Triangle is Scalene");
}