java - ArrayList不添加字符串

Question

我试图获取用户输入的字符串的字数，但结果总是返回“0”。我不知道该怎么办。

public static void main(String[] args) {
    // TODO Auto-generated method stub
    Scanner reader=new Scanner(System.in);
    ArrayList<String> A=new ArrayList<String>();

    System.out.print("Enter a sentence: ");
    String a=reader.next();

    int charCount=a.length();
    int space;
    int period;
    int wordCount=0;
    //word count\

    for (int i=0; i<1; i++){
        space=a.indexOf(" ");
        if (a.charAt(0)!=' '){
            if (space!=-1){
                A.add(i, a.substring(0, space-1));
                a=a.substring(a.indexOf(" ")+1, charCount-1);
            }
            if (space==-1&&a.charAt(charCount-1)=='.'){
                period=a.indexOf(".");
                A.add(i, a.substring(0, period));
            }
            charCount=a.length();
        }
        wordCount=A.size();
    }
    System.out.print("Word Count: "+A.size());  
}

Answer 1

你为什么不尝试这样-

public static void main (String[] args) {
    Scanner reader=new Scanner(System.in);

    System.out.println("Enter a sentence: ");

    String str1 = reader.nextLine();

    String[] wordArray = str1.trim().split("\\s+");
    int wordCount = wordArray.length;

    System.out.println("Word count is = " + wordCount);
}