Question

How to write and read long array from file using DataOutputStream() and DataInputStream() in Java

Answer 1

package javaapplication1;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class JavaApplication1 {

    public static void main(String[] args) throws IOException {

        String sFilePath = "d://data.txt";
        long[] lArr = {100, 3000, 40000, 990000, 1030000, 12980000, 150010000};

        try {

            DataOutputStream dos;
            try (FileOutputStream fos = new FileOutputStream(sFilePath)) {
                dos = new DataOutputStream(fos);
                for (long l : lArr) {
                    dos.writeLong(l);
                }
            }

            DataInputStream dis;
            try (InputStream is = new FileInputStream(sFilePath)) {
                dis = new DataInputStream(is);
                while (dis.available() > 0) {
                    long l = dis.readLong();
                    System.out.print(l + " ");
                }
            }

        } catch (IOException ioe) {
            System.out.println(ioe);
        }
    }
}

/*
      
run:

100 3000 40000 990000 1030000 12980000 150010000
  
 */

 

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