Please Please help on easy program

[sexygal]

I need a program to do the following:

1. Access a file where I would have a list of people each with a different number assigned to them.

2. Ask the user to input one of the numbers

3. return the name which is associated with that number

I have eclipse, and know I need to do something with scanner and sort the array. But I have no idea what.

Any help is appreciated.

[r035198x]

I need a program to do the following:

1. Access a file where I would have a list of people each with a different number assigned to them.

2. Ask the user to input one of the numbers

3. return the name which is associated with that number

I have eclipse, and know I need to do something with scanner and sort the array. But I have no idea what.

Any help is appreciated.

What have you done so far?

[sexygal]

Here is what I have so far. I am trying to get the file I have saved as a .txt file, but I seem lost and can't get it to see the file.
import java.io.*;
import javax.swing.*;

public class FileManager {
private static final String EMPTY_STRING="" ;
private static String lineTerminator = System.getPrope rty("line.separ ator");

public FileManager() {

}

public String openFile() throws FileNotFoundExc eption, IOException {
String doc=EMPTY_STRIN G;

JFileChooser chooser = new JFileChooser();
int reply = chooser.showOpe nDialog(null);

if (reply == JFileChooser.AP PROVE_OPTION){
doc = openFile(choose r.getSelectedFi le().getAbsolut ePath());
}
return doc;
}
public String openFile(String fileName) throws FileNotFoundExc eption, IOException {
String line;
StringBuffer document = new StringBuffer(EM PTY_STRING);

File inFile = new File(fileName);
FileReader fileReader = new FileReader(inFi le);
BufferedReader bufReader = new BufferedReader( fileReader);

while (true){
line = bufReader.readL ine();

if (line == null)
break;
document.append (line + lineTerminator) ;
}
return document.toStri ng();
}
public void saveFile(String data) throws IOException {
String fileName, doc=EMPTY_STRIN G;

JFileChooser chooser = new JFileChooser();
int reply = chooser.showSav eDialog(null);

if (reply == JFileChooser.AP PROVE_OPTION){
saveFile(choose r.getSelectedFi le().getAbsolut ePath(),data);
}
}
public void saveFile(String fileName, String data) throws IOException {
File outFile = new File(fileName);
FileOutputStrea m outFileStream = new FileOutputStrea m(outFile);
PrintWriter outStream = new PrintWriter(out FileStream);

outStream.print (data);
outStream.close ();
}
}


import javax.swing.*;
import java.io.*;
public class UseFileManager {


public static void main(String[] args)throws IOException {
FileManager fm = new FileManager(); //associated file with fm

String doc= "Hello World",doc2; //test string
fm.saveFile(doc );
//fm.saveFile("sa mple.txt",doc); //write to file
doc2=fm.openFil e();
doc2=fm.openFil e("Memberships. txt"); //read from file
JOptionPane.sho wMessageDialog( null,doc2); //verify

}

}

[r035198x]

Here is what I have so far. I am trying to get the file I have saved as a .txt file, but I seem lost and can't get it to see the file.
import java.io.*;
import javax.swing.*;

public class FileManager {
private static final String EMPTY_STRING="" ;
private static String lineTerminator = System.getPrope rty("line.separ ator");

public FileManager() {

}

public String openFile() throws FileNotFoundExc eption, IOException {
String doc=EMPTY_STRIN G;

JFileChooser chooser = new JFileChooser();
int reply = chooser.showOpe nDialog(null);

if (reply == JFileChooser.AP PROVE_OPTION){
doc = openFile(choose r.getSelectedFi le().getAbsolut ePath());
}
return doc;
}
public String openFile(String fileName) throws FileNotFoundExc eption, IOException {
String line;
StringBuffer document = new StringBuffer(EM PTY_STRING);

File inFile = new File(fileName);
FileReader fileReader = new FileReader(inFi le);
BufferedReader bufReader = new BufferedReader( fileReader);

while (true){
line = bufReader.readL ine();

if (line == null)
break;
document.append (line + lineTerminator) ;
}
return document.toStri ng();
}
public void saveFile(String data) throws IOException {
String fileName, doc=EMPTY_STRIN G;

JFileChooser chooser = new JFileChooser();
int reply = chooser.showSav eDialog(null);

if (reply == JFileChooser.AP PROVE_OPTION){
saveFile(choose r.getSelectedFi le().getAbsolut ePath(),data);
}
}
public void saveFile(String fileName, String data) throws IOException {
File outFile = new File(fileName);
FileOutputStrea m outFileStream = new FileOutputStrea m(outFile);
PrintWriter outStream = new PrintWriter(out FileStream);

outStream.print (data);
outStream.close ();
}
}


import javax.swing.*;
import java.io.*;
public class UseFileManager {


public static void main(String[] args)throws IOException {
FileManager fm = new FileManager(); //associated file with fm

String doc= "Hello World",doc2; //test string
fm.saveFile(doc );
//fm.saveFile("sa mple.txt",doc); //write to file
doc2=fm.openFil e();
doc2=fm.openFil e("Memberships. txt"); //read from file
JOptionPane.sho wMessageDialog( null,doc2); //verify

}

}

I do not see where your requirements say you have to open the file. Is it really neccessary/required that you actually open the file?

[r035198x]

How to get the name associated with a number depends on the format of the file containing the names. How are the names and numbers arranged in the text file?

[sexygal]

How to get the name associated with a number depends on the format of the file containing the names. How are the names and numbers arranged in the text file?

I made the file in excel and saved it as a .txt document. I listed the numbers in the first column, and put the names in the second column. So the notepad has it saved with a number, a space, and then the name. Same thing on the next line, and so on. There are fifteen lines, so 15 numbers and 15 names.

[r035198x]

I made the file in excel and saved it as a .txt document. I listed the numbers in the first column, and put the names in the second column. So the notepad has it saved with a number, a space, and then the name. Same thing on the next line, and so on. There are fifteen lines, so 15 numbers and 15 names.

 
public String showName(int pos) throws FileNotFoundException, IOException {
String line = "";

File inFile = new File("Memberships.txt");
FileReader fileReader = new FileReader(inFile);
BufferedReader bufReader = new BufferedReader(fileReader);
while ((line = bufReader.readLine()) != null){
String[] text = line.split(" ");
if(pos == Integer.parseInt(text[0])) {
 return text[i];
}
}
return "Name not Found";
}

This is probably all you need to do.