CHAPTER 8 - INPUT / OUTPUT TEXT FILE
EXAMPLE -
The important thing to
remember :
//the classes use included
import java.util.*;
import java.io.*;
import
java.util.StringTokenizer;
//the declaration
public static void main
(String[] args) throws IOException
//define what file in and
what file out
File fileIn = new File
("dorm.dat");
File fileOut1 = new File
("single.out");
// define the file in
variable and the file out variable
Scanner in = new Scanner
(fileIn);
PrintWriter out_single = new
PrintWriter (fileOut1);
//this is how to write to
file
out_single.println("Id
number\tName\t\tStatus");
// ways to loop the file in
String indata = null;
while (in.hasNext()) {
indata = in.nextLine();
StringTokenizer st = new
StringTokenizer(indata, ";");
// don’t forget to close the
file
in.close();
out.close();
// error catcher
catch (IOException ioe)
{
System.out.println
(ioe.getMessage());
}
catch (Exception ex)
{
System.out.println
(ex.getMessage());
}
import
java.util.*;
import java.io.*;
import
java.util.StringTokenizer;
public class
STUDENT
{
public static void main (String[] args)
throws IOException
{
try
{
File fileIn = new File
("dorm.dat");
if (!fileIn.exists())
{
System.out.println (“File not
exist”);
System.exit(0);
}
String studentid,name, status,
type;
int total_Single =
0,total_SFreshman = 0,
total_SSenior = 0,total_SJunior =
0,total_SSophomore = 0;
int total_Double =
0,total_DFreshman = 0,
total_DSenior = 0,total_DJunior =
0,total_DSophomore = 0;
File fileOut1 = new File
("single.out");
File fileOut2 = new File
("double.out");
Scanner in = new Scanner (fileIn);
PrintWriter out_single = new
PrintWriter (fileOut1);
PrintWriter out_double = new
PrintWriter (fileOut2);
out_single.println("Id
number\tName\t\tStatus");
out_double.println("Id
number\tName\t\tStatus");
String indata = null;
while (in.hasNext())
{
indata = in.nextLine();
StringTokenizer st = new
StringTokenizer(indata, ";");
studentid = st.nextToken();
name = st.nextToken();
status = st.nextToken();
type = st.nextToken();
if (
type.equalsIgnoreCase("SINGLE") )
{
total_Single++;
if (
status.equalsIgnoreCase("SENIOR"))
total_SSenior++;
else if (
status.equalsIgnoreCase("JUNIOR"))
total_SJunior++;
else if (
status.equalsIgnoreCase("FRESHMAN"))
total_SFreshman++;
else
total_SSophomore++;
}
else
{
total_Double++;
if (
status.equalsIgnoreCase("SENIOR"))
total_DSenior++;
else if (
status.equalsIgnoreCase("JUNIOR"))
total_DJunior++;
else if (
status.equalsIgnoreCase("FRESHMAN"))
total_DFreshman++;
else
total_DSophomore++;
}
}
in.close();
out.close();
outPASS.close();
outFAIL.close();
System.out.println("Habis Write
Files!!!\n\n");
}
catch (FileNotFoundException fnf)
{
System.out.println
(fnf.getMessage());
}
catch (IOException ioe)
{
System.out.println
(ioe.getMessage());
}
catch (Exception ex)
{
System.out.println (ex.getMessage());
}
}
}
