java - 异常和数组的问题

Question

无法真正理解这里出了什么问题？

这只是一个数组越界的简单异常。

public class Days
{
    public static void main (String args[])
    {
        String[] dayArray = new String [4];
        {
            dayArray [0] = "monday";
            dayArray [1] = "tuesday";
            dayArray [2] = "wednesday";
            dayArray [3] = "Thursday";
            dayArray [4] = "Friday";

            try
            {
                System.out.println("The day is " + dayArray[5]);
            }
            catch(ArrayIndexOutOfBoundsException Q)
            {
                System.out.println(" invalid");
                Q.getStackTrace();
            }
            System.out.println("End Of Program");
        }
    }
}

有人知道为什么这不能运行吗？我收到错误:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
    at Days.main(Days.java:14)

Answer 1

您应该在其声明中将其声明为能够执行 5 项操作，而不是 4 项操作。

new String [5];