LeetCode - 408. Valid Word Abbreviation

Given a non-empty string s and an abbreviation abbr, return whether the string matches with the given abbreviation.

A string such as "word" contains only the following valid abbreviations:

["word", "1ord", "w1rd", "wo1d", "wor1", "2rd", "w2d", "wo2", "1o1d", "1or1", "w1r1", "1o2", "2r1", "3d", "w3", "4"]

Notice that only the above abbreviations are valid abbreviations of the string "word". Any other string is not a valid abbreviation of "word".

Note:
Assume s contains only lowercase letters and abbr contains only lowercase letters and digits.

Example 1:

Given s = "internationalization", abbr = "i12iz4n":

Return true.

Example 2:

Given s = "apple", abbr = "a2e":

Return false.

看上去不难，但是这道题坑非常多，而且test case 设计的不太好。

public class Solution {
        public boolean validWordAbbreviation(String word, String abbr) {
            int pos = 0;
            int i = 0;
            int num = 0;
            while(i<abbr.length()){
                if(Character.isDigit(abbr.charAt(i))){
                    while(i<abbr.length() && Character.isDigit(abbr.charAt(i))){
                        if(abbr.charAt(i) == '0'&&num == 0){
                            return false;
                        }
                        if(num == 0){
                            num += Integer.parseInt(abbr.charAt(i)+"");
                        }
                        else{
                            num = num*10 + Integer.parseInt(abbr.charAt(i)+"");
                        }
                        i++;
                    }
                    pos += num;
                    num = 0;
                    
                }
                else{
                    if(pos >= word.length()){
                        return false;
                    }
                    if(abbr.charAt(i) != word.charAt(pos)){
                        return false;
                    }
                    pos++;
                    i++;
                }
            }
            return pos == word.length();
        }
}

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