线程“main”中的异常 java.lang.ArrayIndexOutOfBoundsException: 5
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Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 5
提问by Derek MC
public class dereks {
public static void main (String [] args){
int array [] = {1,2,3,5,6,7};
int sum =0;
for(int counter=0; counter<=array.length; counter++){
sum+=array[counter];
}
System.out.println(sum);
}
}
Can anyone tell me whats wrong with this?? I can't understand why I'm getting the error message "Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 5 at dereks.main(dereks.java:7)" .
谁能告诉我这有什么问题吗？？我不明白为什么我会收到错误消息“线程“main”中的异常 java.lang.ArrayIndexOutOfBoundsException: 5 at dereks.main(dereks.java:7)”。
回答by Patricia Shanahan
You are getting the error because your loop limit is <=array.length. The array elements are 0 through array.length-1.
您收到错误是因为您的循环限制是<=array.length. 数组元素是 0 到array.length-1。
回答by Karoly Horvath
Array indices start from 0. This means that the last element is at array.length - 1.
数组索引从0. 这意味着最后一个元素在array.length - 1。
Use: counter < array.length
利用： counter < array.length
回答by Bohemian
Change your for loop terminating condition from <=to <:
改变你的for循环从中止条件<=到<：
for(int counter=0; counter<array.length; counter++){
sum+=array[counter];
}
Or more simply, use foreach syntax:
或者更简单地说，使用 foreach 语法：
for(int i : array){
sum+=i;
}
The foreach syntax is preferred when you don't actually need the index each element is at.
当您实际上不需要每个元素所在的索引时，首选 foreach 语法。
