线程“主”中的异常java.util.NoSuchElementException

Question

i have a file that consist like this

/1/a/a/a/Female/Single/a/a/January/1/1920/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a

and here is my StringTokenizer code:

public void retrieveRecords(){
        String holdStr="";
        try {
            fileRead=new FileReader(fileNew);
            read=new Scanner(fileRead);

            while(read.hasNext()){
                holdStr+=read.nextLine()+"\n";
            }
            read.close();

            StringTokenizer strToken=new StringTokenizer(holdStr, "/");

            while(strToken.hasMoreElements()){
                rows=new Vector();
                for(int i=0; i<column.length; i++){
                    rows.add(strToken.nextElement());
                }
                ViewTablePanel.tblModel.addRow(rows);
            }

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

i actually don't have any idea what is the problem as well as i researched every reason why nosuchelementexception would happened but i am not doing all those reasons why it won't work. any suggestions would be open thank you so much :)

Answer 1

    while(read.hasNext()){

          holdStr+=read.nextLine()+"\n";
     }

From the above, Scanner read does not have any tokenizer, hence, read.hasNext() throws NoSuchElementEXception read.hasNextLine() should work fine

Answer 2

Exception java.util.NoSuchElementException This exception is thrown to indicate that there are no more elements in an tokenizer.

    while(strToken.hasMoreElements()){
        rows=new Vector();
        for(int i=0; i<column.length; i++){
            rows.add(strToken.nextElement()); //Exception will throw on this line
        }
        ViewTablePanel.tblModel.addRow(rows);
    }

In your while loop you have condition for checking more elements using hasMoreElements() . But inside while loop you have for loop which calls nextElement() multiple times. If there is no elements in tokenizer then nextElement() will throw java.util.NoSuchElementException .

Solution :Add some condition in for loop for checking elements in tokenizer.