Question

Write a java code segment to declare an array of size 10 of type String and read data for them from a file, prompt user for the file name. Data is stored in a file with 1 string per line.

Answer 1

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class ReadFile {

    public static void main(String[] args) {
        String[] lines = new String[10];

        System.out.print("Enter file name: ");
        Scanner in = new Scanner(System.in);
        int numLines = 0;

        File file = new File(in.nextLine());    // read a file and create a file.
        try {
            Scanner fin = new Scanner(file);    // create a scanner to read from file
            while (fin.hasNextLine() && numLines < lines.length) { // read each line from file
                lines[numLines++] = fin.nextLine();
            }

            // print array
            System.out.println("Lines read from the file are");
            for (int i = 0; i < numLines; i++) {
                System.out.println(lines[i]);
            }

            fin.close();    // close file.
        } catch (FileNotFoundException e) {
            System.out.println("Error. " + file.getAbsolutePath() + " does not exists!");   // if file does not exist, report an error
        }
    }
}