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cannot get rid of the message Java Deprecated Class

Posted on 2007-03-23
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Last Modified: 2010-03-31
I have simple class to read from text file.  the clas work ok, but the "deprecation" warrning is bugging me :(

C:\>javac FileInput.java -Xlint
FileInput.java:29: warning: [deprecation] readLine() in java.io.DataInputStream
has been deprecated
        System.out.println(dis.readLine());
                              ^
1 warning

C:\>javac FileInput.java
Note: FileInput.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

here is the class:
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

public class FileInput {

  public static void main(String[] args) {
    File file = new File("C:\\que.sql");    
    try {
      fis = new File(file);
        
        BufferedReader in = new BufferedReader(new InputStreamReader(fis));
                
      while (in.available() != 0) {

     
        System.out.println(in.readLine());
      }

      fis.close();
     
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}
0
Comment
Question by:salasadi
  • 3
  • 3
  • 2
  • +1
9 Comments
 
LVL 92

Expert Comment

by:objects
ID: 18779580
that error looks like its coming from a different class that the one you posted.

To get rid of it use a BufferedReader instead of a DataInputStream (as you have done in the posted code)
0
 

Author Comment

by:salasadi
ID: 18780205
It was duplication .java file that confuse me.  I got it to work now, but some how the code loop after reach the null instead stopped:

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.*;
import java.io.*;
import java.text.*;

public class FileInput {
  public static void main(String[] args) {
    File file = new File("C:\\enabled.sql");    
    try {
        BufferedReader in = new BufferedReader(new FileReader(file));
         String line = in.readLine();
            while(line !=null) {      
                  System.out.println(in.readLine());
            }      
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}
0
 
LVL 1

Expert Comment

by:alban4
ID: 18780476
Replace:
         String line = in.readLine();
            while(line !=null) {      
                  System.out.println(in.readLine());
            }      

With:
         String line;
            while((line = in.readLine()) !=null) {      
                  System.out.println(line);
            }      
0
 

Author Comment

by:salasadi
ID: 18780600
it works but the first line in the file is ignored!
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LVL 1

Expert Comment

by:alban4
ID: 18780621
Make sure you're NOT declaring:
    String line = in.readLine();

It should be simply:
    String line;
0
 
LVL 20

Expert Comment

by:gatorvip
ID: 18781319
>>it works but the first line in the file is ignored!

Well, yes:

String line = in.readLine();   // read the first line
while(line !=null) {      
   System.out.println(in.readLine());  // read line, then print it
}

Nowhere do you actually print out the first line. You can either do what alban4 suggests, or make this modification :
String line = in.readLine();
System.out.println(line));  
while.....
0
 

Author Comment

by:salasadi
ID: 18781380
I modified the class as you suggested:

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.*;
import java.io.*;
import java.text.*;
public class FileInput {
  public static void main(String[] args) {
    File file = new File("C:\\test.txt");    
    try {
        BufferedReader in = new BufferedReader(new FileReader(file));
            while(in.readLine() !=null) {  
                  
                  System.out.println(in.readLine());
            }      
            in.close();
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

here is my text file:

the is 1st test for read line
this is 2nd test
this is third test
this is 4th test

here is the java output:

C:\>java FileInput
this is 2nd test
this is 4th test

somehow I am skipping lines!

0
 
LVL 20

Assisted Solution

by:gatorvip
gatorvip earned 200 total points
ID: 18781454
You are skipping lines because you read twice, but only print once...


while(in.readLine() !=null) {       // you read once here, but you don't print
  System.out.println(in.readLine());  // you read again here, and you do print
}  
0
 
LVL 1

Accepted Solution

by:
alban4 earned 300 total points
ID: 18781510
Modify the code as I suggested above:

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.*;
import java.io.*;
import java.text.*;
public class FileInput {
  public static void main(String[] args) {
    File file = new File("C:\\test.txt");    
    try {
        BufferedReader in = new BufferedReader(new FileReader(file));
        String line;
        while((line = in.readLine()) !=null) {      
            System.out.println(line);
         }    
          in.close();
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}
0

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