PrintWriter failing to print to file

The file is being created successfully, but I cannot get PrintWriter to print an开发者_高级运维ything to the text file. Code:

import java.io.File;
import java.util.Scanner;
import java.io.IOException;
import java.io.PrintWriter;

public class exams {
    public static void main (String[] args) throws IOException{
        Scanner scanner = new Scanner(System.in);
        System.out.println("How many scores were there?");
        int numScores = scanner.nextInt();
        int arr[] = new int[numScores];

        for (int x=0; x<numScores; x++){
            System.out.println("Enter score #" + (x+1));
            arr[x] = scanner.nextInt();
        }

        File file = new File("ExamScores.txt");
        if(!file.exists()){
           file.createNewFile();
           PrintWriter out = new PrintWriter(file);
            for (int y=0; y<arr.length; y++){
                out.println(arr[y]);
            }
        }
        else {
            System.out.println("The file ExamScores.txt already exists.");
        }   
    }
}

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You have to flush and / or close the file to get the data written to the disk.

Add out.close() in your code:

PrintWriter out = new PrintWriter(file);
for (int y=0; y<arr.length; y++){
    out.println(arr[y]);
}
out.close()

---

You need to close the PrintWriter before the program exits which has the effect of flushing the print stream to ensure everything is written to the file. Try this:

PrintWriter out = null;
try {
    //...
    out = new PrintWriter(file);
    //...
} finally {
    if (out != null) {
        out.close();
    }
}

---

u need to flush and close the file once done writing http://download.oracle.com/javase/1.4.2/docs/api/java/io/PrintWriter.html void close() Close the stream. void flush() Flush the stream.

---

printwriter class works with streams not with files, that is why you can not write to that file. you need to create a file by using FileOutputStream, after that you will be able to use printwriter in order to write to that file. Try this:

FileOutputStream exam = new FileOutputStream("ExamScores.txt"); PrintWriter out = new PrintWriter(exam, true);