Mark Andy

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since Feb 15, 2016

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Recent posts by Mark Andy

Sequential Search

I'm trying to do a sequential search & binary of a data file and key file. I took some hints from class and put it together. Now I'm stuck on how to actually run the sequential search for the two files. Any push forward would help!

import java.io.FileNotFoundException;
import java.io.FileReader; // both needed
import java.io.BufferedReader; // for line input
import java.io.IOException;
import javax.swing.JFileChooser;
import java.io.File;
import java.util.Scanner;
public class Search {
String dataFilePath ;
String dataFileName;
String keyFilePath;
String keyFileName;
int index;
int index1;
public void openFiles()
{
dataFilePath = null;
dataFileName = null;
JFileChooser Datachooser = new JFileChooser();
Datachooser.setDialogType(JFileChooser.OPEN_DIALOG );
Datachooser.setDialogTitle("Open Data File");
int returnVal = Datachooser.showOpenDialog(null);
if( returnVal == JFileChooser.APPROVE_OPTION)
{
dataFilePath = Datachooser.getSelectedFile().getPath();
dataFileName = Datachooser.getSelectedFile().getName();
ProcessFileData();
}
{
keyFilePath = null;
keyFileName = null;
JFileChooser Keyschooser = new JFileChooser();
Keyschooser.setDialogType(JFileChooser.OPEN_DIALOG );
Keyschooser.setDialogTitle("Open Data File");
int returnVal1 = Keyschooser.showOpenDialog(null);
if( returnVal1 == JFileChooser.APPROVE_OPTION)
{
keyFilePath = Keyschooser.getSelectedFile().getPath();
keyFileName = Keyschooser.getSelectedFile().getName();
ProcessFileKeys();
}
}
}
// public void openKeys()
// {
// keyFilePath = null;
// keyFileName = null;
//
// JFileChooser chooser = new JFileChooser();
// chooser.setDialogType(JFileChooser.OPEN_DIALOG );
// chooser.setDialogTitle("Open Data File");
//
// int returnVal = chooser.showOpenDialog(null);
// if( returnVal == JFileChooser.APPROVE_OPTION)
// {
// keyFilePath = chooser.getSelectedFile().getPath();
// keyFileName = chooser.getSelectedFile().getName();
// }
// }
public void ProcessFileData()
{
try {
Scanner DataTextFile = new Scanner(new File(dataFilePath));
int[] DataArray = new int[1000001];
while (DataTextFile.hasNext())
{
// read the next integer
DataArray[index] = DataTextFile.nextInt();
index++;
}
}
catch(IOException ioe)
{
System.exit(0);
}
}
public void ProcessFileKeys()
{
try {
Scanner KeyTextFile = new Scanner(new File(dataFilePath));
int[] KeyArray = new int[1000001];
while (KeyTextFile.hasNext())
{
// read the next integer
KeyArray[index1] = KeyTextFile.nextInt();
index1++;
}
}
catch(IOException ioe)
{
System.exit(0);
}
}
long startTimeLin = System.nanoTime();
public static int LinearSearch(int[] list, int key)
{
for (int i = 0; i < list.length; i++)
{
if (key == list[i])
return i;
}
return -1;
}
long finishTimeLin = System.nanoTime();
long elapsedTimeLin = startTimeLin - finishTimeLin;
long startTimeBin = System.nanoTime();
public static int binarySearch(int[] list, int key)
{
int low = 0;
int high = list.length -1;
while (high >= low) {
int mid = (low + high) / 2;
if (key < list[mid])
high = mid -1;
else if (key == list[mid])
return mid;
else
low = mid + 1;
}
return -1 - low;
}
long finishTimeBin = System.nanoTime();
long ElapsedTimeBin = startTimeBin - finishTimeBin;
}

9 years ago

Beginning Java

Frequency of ASCII Characters

So I would begin with your code in the "while" statement?

9 years ago

Beginning Java

Frequency of ASCII Characters

So my problem is, my program has read a text file and display in a GUI the frequency of all characters ASCII [256]. Now this is a homework assignment so I'm looking for pointers on how to do this when it comes down to ASCII and not just a-z. What should I start writing in the while statement. I will worry about displaying it in my GUI once i figure out exactly what to do here first.

public class TextFile
{
// File Parameters
String dataFilePath ;
String dataFileName;
int[] count = new int[256];
int[] token = new int[30];
public TextFile ()
{
dataFilePath = null;
dataFileName = null;
for (int i = 0; i<count.length; i++)
count[i] = 0;
for (int i = 0; i<token.length; i++)
token[i] = 0;
}
public void openFile()
{
dataFilePath = null;
dataFileName = null;
JFileChooser chooser = new JFileChooser();
chooser.setDialogType(JFileChooser.OPEN_DIALOG );
chooser.setDialogTitle("Open Data File");
int returnVal = chooser.showOpenDialog(null);
if( returnVal == JFileChooser.APPROVE_OPTION)
{
dataFilePath = chooser.getSelectedFile().getPath();
dataFileName = chooser.getSelectedFile().getName();
}
}
public void processFile()
{
try
{
// initialize counting array
for (int k=0; k<256; k++)
count[k]=0;
// Instantiate streams
BufferedReader inputStream = new BufferedReader(new FileReader(dataFilePath));
// read the file line by line and count the characters read
int nextChar;
String entireFile = "";
while ((nextChar = inputStream.read()) != -1)
{
}
tokenizeFile();
inputStream.close();
}
catch(IOException ioe)
{
System.exit(0);
}
}
public void tokenizeFile()
{
}
}

9 years ago

Beginning Java

JFileChooser keeps coming up after I selected the file.

Thanks so much, I knew it had to be simple, Very new with GUI so I appreciate your explanation with that!!

9 years ago

Beginning Java

JFileChooser keeps coming up after I selected the file.

So there are two different classes TextFile and Project02. Project02 is GUI which I try and hit open file. It opens JFileChooser and I select a file and hit open then right away just opens the JFileChooser again.. I just need some pointers on where to fix this issue. I believe it would be in the "IF-ELSE" but I'm trying to maintain the same structure as this is for school.

import java.io.FileReader; // both needed
import java.io.BufferedReader; // for line input
import java.io.IOException;
import javax.swing.JFileChooser;
import java.io.File;
import java.util.Scanner;
public class TextFile
{
// File Parameters
String dataFilePath ;
String dataFileName;
int[] count = new int[256];
int[] token = new int[30];
public TextFile ()
{
dataFilePath = null;
dataFileName = null;
for (int i = 0; i<count.length; i++)
count[i] = 0;
for (int i = 0; i<token.length; i++)
token[i] = 0;
}
public void openFile()
{
dataFilePath = null;
dataFileName = null;
JFileChooser chooser = new JFileChooser();
chooser.setDialogType(JFileChooser.OPEN_DIALOG );
chooser.setDialogTitle("Open Data File");
int returnVal = chooser.showOpenDialog(null);
if( returnVal == JFileChooser.APPROVE_OPTION)
{
dataFilePath = chooser.getSelectedFile().getPath();
dataFileName = chooser.getSelectedFile().getName();
}
}
public void processFile()
{
try
{
// initialize counting array
for (int k=0; k<256; k++)
count[k]=0;
// Instantiate streams
BufferedReader inputStream = new BufferedReader(new FileReader(dataFilePath));
// read the file line by line and count the characters read
int integerValue;
String entireFile = "";
while ((integerValue = inputStream.read()) != -1)
{
}
tokenizeFile();
inputStream.close();
}
catch(IOException ioe)
{
System.exit(0);
}
}
public void tokenizeFile()
{
// Bonus
}
}

// GUI-related imports
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Project02 extends Frame implements ActionListener
{
// program description displayed in About menu
String[] description = new String[] {
" This program receives two integer numbers and calculates",
" and Displays the sum, difference and product of the numbers entered",
" Input:",
" -- Two integer numbers ",
" Output:",
" -- sum, difference and product of input numbers"
};
TextFile t = new TextFile();
// Retrieved command code
String command = "";
public static void main(String[] args)
{
Frame f = new Project02();
f.setResizable(true);
f.setSize(550,500);
f.setVisible(true);
}
public Project02()
{
setTitle("Text File Operations - Anderson, Mark");
// Create Menu Bar
MenuBar mb = new MenuBar();
setMenuBar(mb);
// Create Menu Group Labeled "File"
Menu fileMenu = new Menu("File");
// Add it to Menu Bar
mb.add(fileMenu);
// Create Menu Items
// Add action Listener
// Add to "File" Menu Group
MenuItem miAbout = new MenuItem("About");
miAbout.addActionListener(this);
fileMenu.add(miAbout);
MenuItem miExit = new MenuItem("Exit");
miExit.addActionListener(this);
fileMenu.add(miExit);
// Create Menu Group Labeled "Mathematics"
Menu operationsMenu = new Menu("Operations");
// Add it to Menu Bar
mb.add(operationsMenu);
// Create Menu Items
// Add action Listener
// Add to "Mathematics" Menu Group
MenuItem miOpenFile = new MenuItem("Open File");
miOpenFile.addActionListener(this);
operationsMenu.add(miOpenFile);
MenuItem miProcess = new MenuItem("Process");
miProcess.addActionListener(this);
operationsMenu.add(miProcess);
Menu reportMenu = new Menu("Report");
mb.add(reportMenu);
MenuItem miFreqChar = new MenuItem("Frequency of ASCII characters");
miFreqChar.addActionListener(this);
reportMenu.add(miFreqChar);
MenuItem miLetters = new MenuItem("Frequency of Letters");
miLetters.addActionListener(this);
reportMenu.add(miLetters);
MenuItem miDigits = new MenuItem("Frequency of Digits");
miDigits.addActionListener(this);
reportMenu.add(miDigits);
MenuItem miWords = new MenuItem("Frequency of Words (Length 1-20)");
miWords.addActionListener(this);
reportMenu.add(miWords);
// End program when window is closed
WindowListener l = new WindowAdapter()
{
public void windowClosing(WindowEvent ev)
{
System.exit(0);
}
public void windowActivated(WindowEvent ev)
{
repaint();
}
public void windowStateChanged(WindowEvent ev)
{
repaint();
}
};
ComponentListener k = new ComponentAdapter()
{
public void componentResized(ComponentEvent e)
{
repaint();
}
};
// register listeners
this.addWindowListener(l);
this.addComponentListener(k);
}
//******************************************************************************
// called by windows manager whenever the application window performs an action
// (select a menu item, close, resize, ....
//******************************************************************************
public void actionPerformed (ActionEvent ev)
{
// figure out which command was issued
command = ev.getActionCommand();
// take action accordingly
if ("About".equals(command))
{
System.out.println("command is: "+command);
repaint();
}
else
if("Exit".equals(command))
{
System.out.println("command is: "+command);
System.exit(0);
}
else
if("Open File".equals(command) || "Process".equals(command) || "Frequency of ASCII characters".equals(command) ||
"Frequency of Letters".equals(command) || "Frequency of Digits".equals(command) ||
"Frequency of Words (Length 1-20)".equals(command))
{
System.out.println("command is: "+command);
repaint();
}
}
//********************************************************
// called by repaint() to redraw the screen
//********************************************************
public void paint(Graphics g)
{
int x=200;
int y=150;
if ("About".equals(command))
{
for (int i=0; i<6; i++)
{
g.drawString(description[i],x-120,y+40);
y=y+25;
}
}
else
if("Open File".equals(command))
{
t.openFile();
//g.drawString(Integer.toString(t.processFile())+" +",x+50,y);
y=y+25;
g.drawLine(x+40,y,x+80,y);
y=y+25;
}
}
}

9 years ago

Beginning Java