使用.split在Java中拆分字符串数组

Question

I have browsed through questions similar to mine already on here, but have not found anything that will work for me.

Essentially what I have to do is read a file full of strings line by line, print them line by line and then word by word. I would like to accomplish this using .split to create an array of each individual string.

For instance, my file reads:
The fat cat was black
The cow jumped over the moon
I came to say hello world

etc.

I have figured out how to read the file and print the file line by line, but I cannot figure out how to print it word by word. Each of these 3 are in their own functions, so I'm not sure if that plays any role in where something is placed.

This is what I have so far in my method:

static public void printWords( String [ ] arr, int count )
{
    String [] s2 = arr[0].split( " " ); 

    for( int i = 0; i < count; i++)
    {
        System.out.println(  s2 [i] );
    }

    System.out.println();  
}

However, this is giving me an error. I switched around a couple things, but each time it prints either just the lines or stops at a certain point. The only thing I have in main is my method call pertaining to this, which is not the problem. If anyone has any insight it would be greatly appreciated. Thank you!

EDIT:

"Count" in my code is the number of lines in the file I am reading. So for this, it is 3.

I have tweaked the code to get what I need, however it only prints the first sentence.

String [] s2 = arr[0].split( " " );
    for (int j = 0 ; j < count ; j++)
    {

        for( int i = 3; i < s2.length; i++)
        {

        System.out.print(  s2 [i] + " " );
        }
    System.out.println();

    }

}

For example, this only prints
The fat cat was black

And then ends. I am trying to construct another loop around it (as demonstrated by my code) but it ends up just printing "The fat cat was black" 3 times rather than moving to the next line of the file.

Answer 1

Try something like this:

static public void printWords(String [ ] arr)
{

  for(String s : arr) {
      String[] s2 = s.split(" ");
      for(String results : s2) {
          System.out.println(results);
      }
  }

}

With this you don't need the count variable either.

Answer 2

你的for循环停止在count而不是（array.length || count）可能是一个错误

Answer 3

The count can only be used for the number of lines which make sense if this is a homework problem. You were close to the solution but you had your split statement in the wrong place.

The String array arr contains the strings from the file and the count is the number of lines taken the from the file so it is a limit for the iterator that will go through the arr array. You had the right idea by using a seperate iterator to go through the s2 array as it only contained the words from a single line from arr.

Try this:

static public void printWords( String [ ] arr, int count )
{
    for (int j = 0 ; j < count ; j++)
    {
        String [] s2 = arr[j].split( " " );
        for( int i = 0; i < s2.length; i++)
        {
            System.out.print(  s2 [i] + " " );
        }
        System.out.println();
    }
}

Answer 4

To specifically split by white space.

public void split() {
            ArrayList<String> myArray=new ArrayList<>();
            myArray.add("The fat cat was black");
            myArray.add("The cow jumped over the moon");
            for (String strLine : myArray) {
                String[] strWord = strLine.split("[\\s']");
                for (String s : strWord) {
                    System.out.println(s);
                }
            }

        }

here [\\\\s'] represents a white space, tabs, line breaks.