为什么不打印单词的最后一个字符？

Question

I'm using java. I'm trying pull out the last letter of a word of 8 characters or less. Then pulling out each character after

    lengthOfWord = word.length();
    lc = word.charAt(lengthOfWord -1);

    if (lengthOfWord == 1)
        System.out.println(lc);

When I try to use a word with one character, it says "String index out of range: -1" and when I try using a word of two characters, it says build successfully, but doesn't print anything.

Answer 1

lengthOfWord is past the bounds of word . Use:

lc = word.charAt(lengthOfWord - 1);

Remember that .length() returns the number of characters of an object, but the index of an object starts at 0 and ends at length()-1 .

UPDATE Try this to check all characters in the word:

for (int i = 0; i < word.length(); i++) {
  System.out.println("Char " + i + ": " + word.charAt(i));
}

Answer 2

lengthOfWord基于0，因此您可能想尝试lc = word.charAt（lengthOfWord-1）;