Question

我正在尝试用Java创建一个识别三角形的程序（只是为了好玩）。这是代码：

import java.util.*;
public class MainClass {
public static void main(String[] args) {

    int sides[] = new int[3];
    for(int i = 0; i<sides.length; i++){
        if(i == 0){
            System.out.println("What is the measure of the first side?");
            Scanner side1 = new Scanner(System.in);
            sides[i] = side1.nextInt();
        }
        else if(i == 1){
            System.out.println("What is the measure of the second side?");
            Scanner side2 = new Scanner(System.in);
            sides[i] = side2.nextInt();
        }
        else{
            System.out.println("What is the measure of the third side?");
            Scanner side3 = new Scanner(System.in);
            sides[i] = side3.nextInt();
        }
    }
    if(sides[1] == sides[2] && sides[2] == sides[3]){
        System.out.println("It's an equilateral triangle.");
    }
    else if(sides[1] == sides[2] || sides[1] == sides[3] || sides[2] == sides[3]){
        System.out.println("It's an isosceles triangle.");
    }
    else{
        System.out.println("It's a scalene triangle.");
    }
}

}

但是，当我运行代码时，它会询问所有三个方面，然后它会引发异常：Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3 at MainClass.main(MainClass.java:29)。我正确输入所有内容，除上述异常外没有任何错误。你们中的任何人都知道什么是错的，如果是的话，我该如何解决？

Answer 1

数组索引从0开始而不是1.因此，您需要在第26行修改代码：

 if(sides[0] == sides[1] && sides[1] == sides[2]){
        System.out.println("It's an equilateral triangle.");
    }
 else if(sides[0] == sides[1] || sides[1] == sides[2] || sides[0] == sides[2]){
        System.out.println("It's an isosceles triangle.");
    }

识别三角形程序

1 个答案: