Java：如何将文本文件中的所有单词保存在String数组上

Question

I am trying to write a code that reads a file and puts all the words on a String array and then it prints all the array as a column. I wrote a code that should work but instead of getting the words printed, I get only "null" all the time.

The problem must be on the: word[totalWords] = read.inWord();

What do you recommend me to write instead, to get the words correctly stored?

public static void main(String[] args){

    In read = new In (args[0]);

    int totalWords = 0;

    String word[] = new String[31000];
    int uniqueWords[] = new int[31000];

    while(read.endOfFile() == false) {

        word[totalWords] = read.inWord();
        totalWords++;
        System.out.println(word[totalWords]);
    }
}

Answer 1

You are printing the element at the index after the one you've modified which hasn't been initialized yet, ie. is null . Flip your logic

word[totalWords] = read.inWord();
System.out.println(word[totalWords]);
totalWords++;

Answer 2

You are printing the word a bit late. It should be:

word[totalWords] = read.inWord();
System.out.println(word[totalWords]);
totalWords++;

ie you should first print the word and then increment the counter. In your case you are trying to print the value of the unassigned array element, hence you get null .

More beautiful way would be :

 word[totalWords] = read.inWord();
 System.out.println(word[totalWords++]);