While循环无法正常工作。ArrayIndexOutOfBoundsException
While循环无法正常工作。ArrayIndexOutOfBoundsException
提问于 2014-03-23 19:02:11
我的while循环条件似乎不起作用，我试着用<和<=做这个条件，但它仍然不起作用当我输入找不到的东西时，总是给我outofbounds错误。当我输入可以找到的东西时，它工作得很好，但当找不到它时，它就会出现outofbounds错误
错误消息如下
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 20代码：
public static void main(String[] args) {
int listsize;
int[] listTosearch = new int[20];
int elementTofind;
boolean found = false;
int indexToSearch;
int indexOfelementTofind = -1;
Scanner myScanner = new Scanner(System.in);
System.out.println("Size of list to search?");
listsize = myScanner.nextInt();
for (int i = 0; i <= listsize - 1; i++){
listTosearch[i] = 1 + (int) (Math.random()*(100-1)+1);
System.out.println(listTosearch[i]);
}
System.out.println("Element to find?");
elementTofind = myScanner.nextInt();
indexToSearch = 0;
while (indexToSearch < listsize -1 || found == false){ // This is the line that isn't working
if (listTosearch[indexToSearch] == elementTofind ){
found = true;
indexOfelementTofind = indexToSearch + 1 ;
}
indexToSearch ++;
}
if (found == true){
System.out.println(elementTofind + " is at index " + indexOfelementTofind);
} else {
System.out.println("The element was not found");
}
}回答 1
Stack Overflow用户
发布于 2014-03-23 19:07:27
while (indexToSearch < listsize -1 || found == false){应该是：
while (indexToSearch < listsize -1 && found == false){或者正如peter.petrov所指出的：
while (indexToSearch < listsize && !found)来实际搜索整个数组。
您还可以考虑通过更改以下内容来提高代码的可读性：
for (int i = 0; i <= listsize - 1; i++){至
for (int i = 0; i < listsize; i++){这也有点奇怪：
if (listTosearch[indexToSearch] == elementTofind ){
found = true;
indexOfelementTofind = indexToSearch + 1 ;
}并使其具有误导性：
System.out.println(elementTofind + " is at index " + indexOfelementTofind);由于找到的元素位于索引indexToSearch而不是indexToSearch + 1
public static void main(String[] args) {
Scanner myScanner = new Scanner(System.in);
System.out.println("Size of list to search?");
int listSize = myScanner.nextInt();
int[] listToSearch = new int[listSize];
for (int i = 0; i < listSize; i++) {
listToSearch[i] = 1 + (int) (Math.random()*(100-1)+1);
System.out.println(listToSearch[i]);
}
System.out.println("Element to find?");
int elementToFind = myScanner.nextInt();
int index = 0;
boolean found = false;
while (index < listSize && !found) {
if (listToSearch[index] == elementToFind) {
found = true;
} else {
index++;
}
}
if (found) {
System.out.println(elementToFind + " is at index " + index);
} else {
System.out.println("The element was not found");
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/22589971
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