Re: write read string data

bH wrote:
On Nov 20, 11:09 pm, Roedy Green <see_webs...@xxxxxxxxxxxxxxxxxxxx>
wrote:
On Tue, 20 Nov 2007 07:02:20 -0800 (PST), bH <bherbs...@xxxxxxxxxxx>
wrote, quoted or indirectly quoted someone who said :

I am attempting to write data into a file and read it
back again.
You have to read back with the same technique you write out with.

e.g. write objects / read objects.
write binary / read binary
write encoded chars / read encoded chars

Seehttp://mindprod.com/applet/fileio.html
for sample code to do it various ways.

You might do it each way and examine the file with a hex viewer to
understand the different formats.
--
Roedy Green Canadian Mind Products
The Java Glossaryhttp://mindprod.com

Hi All.

I am not sure, at this point, if this is what was expected.

bH

import java.io.*;

public class Example4withIO {

public static void main(String[] args) {
Example4withIO example4withIO =
new Example4withIO();
GetData getData1 = new GetData();
}
public Example4withIO() {
System.out.println("inside Example4withIO");
// final String[] names = {"First Name",
// "Last Name", "Favorite Color",
// "Favorite Number", "Vegetarian"};
final Object[][] data = {
{"Mark", "Andrews", "Red", new Integer(2),
Boolean.TRUE},
{"Tom", "Ball", "Blue", new Integer(99),
Boolean.FALSE},
{"Alan", "Chung", "Green", new Integer(838),
Boolean.FALSE},
{"Jeff", "Dinkins", "Turquois", new Integer(8),
Boolean.TRUE},
{"Amy", "Fowler", "Yellow", new Integer(3),
Boolean.FALSE},
};
try {
FileOutputStream fileOut =
new FileOutputStream("C:\\myarray.data");
ObjectOutputStream objOutStream =
new ObjectOutputStream (fileOut);
objOutStream.writeObject(data);
objOutStream.flush();
objOutStream.close();
}
catch (IOException e)
{
System.out.println("error getting data");
}
}
}

import javax.swing.*;
import java.io.*;

public class GetData extends JPanel {

String tempStrng = new String();

public GetData () {
System.out.println("inside GetData");
try {
FileInputStream fileIn =
new FileInputStream("C:\\myarray.data");
ObjectInputStream objInStream =
new ObjectInputStream(fileIn);
tempStrng.equals(objInStream.readObject());
if(tempStrng!= null){
System.out.println(tempStrng); //no data
}
objInStream.close();
}
catch (Exception ee) {
ee.printStackTrace();
}
}
}

I'm not sure what you are trying to do when reading the object back. Originally you stored a Object[][], and then you compare it to a String. The value of the comparison (true or false) is ignored and you happily continue with checking if your string is not null. Perhaps you wanted something like this:

import javax.swing.*;
import java.io.*;

public class GetData extends JPanel {

Object[][] tempObj;

public void GetData () {
System.out.println("inside GetData");
try {
FileInputStream fileIn = new FileInputStream("C:\\myarray.data");
ObjectInputStream objInStream = new ObjectInputStream(fileIn);
tempObj = (Object[][])(objInStream.readObject());
if(tempObj!= null){
for (Object[] oa: tempObj) {
for (Object o: oa) {
System.out.print(o);
System.out.print(" ");
}
System.out.println();
}
}
objInStream.close();
}
catch (Exception ee) {
ee.printStackTrace();
}
}
}

Note, I have not compiled this.

//Roger Lindsjö
.

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