2047. 句子中的有效单词数

class Solution {
  public int countValidWords(String sentence) {
		boolean flag = true;
		String [] strs = sentence.split(" ");
		
		int count=0;int gen=0;
		for(int i=0;i0 && gen==0) {
							if(('a'<=strs[i].charAt(j-1)&&strs[i].charAt(j-1)<='z') &&('a'<=strs[i].charAt(j+1)&&strs[i].charAt(j+1)<='z')){
								gen++;
							}else {
								flag = false;
								break;
							}
						}
						
					}else {
						flag = false;
						break;
					}
					
					
					
				}else {
					if(strs[i].charAt(j)=='-') {
						flag = false;
						break;
					}else if('a'<=strs[i].charAt(j)&& strs[i].charAt(j)<='z') {
						
					}else if(strs[i].charAt(j)=='!'||strs[i].charAt(j)=='.'||strs[i].charAt(j)==','||strs[i].charAt(j)==' ') {
						
					}else if('0'<=strs[i].charAt(j)&& strs[i].charAt(j)<='9') {
						flag = false;
						break;
					}else {
						flag = false;
						break;
					}
				}
			}
			if(flag)
			count++;
		}
		
		
		return count;
    }
}