error with basic java code

Question

This is some basic java code:

package javaapplication32;

import java.io.*;

public class JavaApplication32 {
    public static void main(String[] args)throws Exception {
        try{
            out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("dec.dat")));
            in = new DataInputStream(new BufferedInputStream(new FileInputStream("enc.dat")));

            String enc=in.readUTF();
            System.out.println(enc);
        }catch(EOFException e){
        }
    }   
}

I am getting the error that it cannot find the symbol 'in' or 'out'

How about declaring the variables before using them?

Eran
– Eran

2014-11-13 17:19:11 +00:00
Commented Nov 13, 2014 at 17:19 — Eran
– Eran, Commented Nov 13, 2014 at 17:19
You havent declared out or in

ryekayo
– ryekayo

2014-11-13 17:19:14 +00:00
Commented Nov 13, 2014 at 17:19 — ryekayo
– ryekayo, Commented Nov 13, 2014 at 17:19

Chris Forrence · Accepted Answer · 2014-11-13 17:24:36Z

7

You should declare them first.

public static void main(String[] args)throws Exception {
    DataOutputStream out = null; 
    DataInputStream in = null;
    try{
        out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("dec.dat")));
        in = new DataInputStream(new BufferedInputStream(new FileInputStream("enc.dat")));

        String enc=in.readUTF();
        System.out.println(enc);
    }catch(EOFException e){
    }
}

edited Nov 13, 2014 at 17:24

Chris Forrence

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answered Nov 13, 2014 at 17:19

subash

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Comments

Mureinik · Accepted Answer · 2014-11-13 17:19:35Z

6

In order to define variables you must give them types, e.g.:

OutpustStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("dec.dat")));
InputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream("enc.dat")));

answered Nov 13, 2014 at 17:19

Mureinik

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Comments

user1231232141214124 · Accepted Answer · 2014-11-13 17:19:54Z

3

You have not actually declared anything as in or out.

DataInputStream in =

DataOutputStream out =

answered Nov 13, 2014 at 17:19

user1231232141214124

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Comments

Daniel · Accepted Answer · 2016-11-03 05:38:07Z

2

This should work.

package javaapplication32;
import java.io.*;

public class JavaApplication32 {
    public static void main(String[] args)throws Exception {
        try {
            DataOutputStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("dec.dat")));
            DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream("enc.dat")));

            String enc=in.readUTF();
            System.out.println(enc);
        } catch(EOFException e) {
        }
    }   
}

edited Nov 3, 2016 at 5:38

Daniel

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answered Nov 3, 2016 at 4:16

Ashiq Imran

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Comments

Alex · Accepted Answer · 2017-03-16 10:58:56Z

0

You need to declare in and out as something first!

DataInputStream in =

DataOutputStream out =

E.g.

out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("dec.dat")));
    in = new DataInputStream(new BufferedInputStream(new FileInputStream("enc.dat")));

answered Mar 16, 2017 at 10:58

Alex

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Comments

ASK Arjun · Accepted Answer · 2018-01-27 16:21:05Z

-3

In Java, Pre Initialisation of strings is mandatory. Only then you can use them inside a program. Easiest way to do this is:

String in="";
String out="";

You should be fine...

answered Jan 27, 2018 at 16:21

ASK Arjun

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1 Comment

GhostCat Over a year ago

Sorry, this is plain nonsense. in and out aren't Strings, they are Input/Output streams. And it is not about initialisation, but about declaration. Your answer adds nothing new. And worse: it only adds wrong information.

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