Lenghth of Last Word
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description:
Given a string s consists of upper/lower-case alphabets and empty space characters ‘ ‘
, return the length of last word in the string.
If the last word does not exist, return 0.
Note: A word is defined as a character sequence consists of non-space characters only.
For example,
Given s = "Hello World"
,
return 5
Thoughts:
首先,我们先要知道s的长度是否为0,如果为0的话直接返回0。否则的话,我们从最后面开始找到第一个不为“ ”的字符,如果找不到也直接返回0,否则的话我们计算从这个字符开始连续的不为“ ”的字符的长度。这个长度就是我们所求的值。
以下是我的java代码:
package easy; public class LengthOfLastWord { public int lengthOfLastWord(String s) { int position = s.length() - 1; if(s.isEmpty()){ return 0; }else{ while(position >= 0){ if(s.charAt(position) == ‘ ‘){ position--; }else{ break; } } if(position == -1){ return 0; }else{ for(int i = position;i>=0;){ if(s.charAt(i) != ‘ ‘ ){ i--; }else{ return position-i; } } } } return position+1; } public static void main(String[] args){ LengthOfLastWord l = new LengthOfLastWord(); String s =" "; System.out.println(l.lengthOfLastWord(s)); } }
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