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What is more user friendly than using a finger to tap the caps lock key?
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static void addObject(Object o,File f)throws IOException{
RandomAccessFile raf=new RandomAccessFile(f);
raf.seek(f.length());
ObjectOutputStream out=new ObjectOutputStream(new RAFOutputStream(raf));
out.write(obj);
out.close();
static Vector readAll(File f)throws IOException{
ObjectInputStream in=new ObjectInputStream(new FileInputStream(f));
Vector v=new Vector();
Object obj;
while((obj=in.readObject())!=null){
v.addElement(obj);
return v;
class RAFOutputStream extends OutputStream{
private RandomAccessFile raf;
RAFOutputStream(RandomAccessFile raf){
this.raf=raf;
public void write(int b)throws IOException{
raf.write(b);
public void close()throws IOException{
raf.close();
} -
Suggestions on how to make this coding better?
Hey everyone, I was just wondering if anyone had any suggestions on how to make my code better. It's for a project and I want to get a good grade on it. It works fine but I just want to see what everyone thought before I hand it in.
import java.io.*;
import java.util.StringTokenizer;
This class process the input expressions containing rational expressions and proecesses them and then outputs the results.
@author *****
@version 1.0
public class Proj1
private static String buffer = null; //User input
private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
private static PrintWriter outfile = null;
private static int totCount = 0, goodCount = 0, badCount = 0; //Total, Valid, and Invalid counts
private static boolean fileInput = false; //File to read data
private static boolean fileOutput = false; //Output for the data
private static boolean screenOutput = false; //Output so the user can view it
private static String outFile = null; //File for output
private static String inFile = null; //File for input
Main method
public static void main (String[] args) throws Exception
Proj1 proj1 = new Proj1();
proj1(args);
runs the program
private static void proj1(String [] args) throws Exception
if (args.length == 0)
printBanner();
System.out.println("\n" + "\n" + "Please enter an expression, or type quit");
do
screenOutput=true;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
processData();
}while(!buffer.equals("quit"));//exits if quit is entered
if (args[0].charAt(0) != '-')
badOption("Invalid Option Specified ");
for(int i=1; i<args[0].length(); i++)
switch(args[0].charAt(i))
case 'f': fileInput = true;
break;
case 'o': fileOutput = true;
break;
case 'b': fileOutput = true;
screenOutput = true;
break;
default: printBanner();
invalidOption("Proj1: Invalid Option Found: " + args[0].charAt(i));
if(fileInput && args[0].length() == 2)
screenOutput = true;
if(fileInput && !fileOutput)
if(args.length == 1)
badOption("No Input File Specified.");
else
File inFile = new File(args[1]);
if(!inFile.exists())
nonExist("Input File " + args[1] + " not found");
br = new BufferedReader(new FileReader(args[1]));
printBanner();
processData();
closeFiles();
if(fileOutput && fileInput)
printBanner();
if(args.length > 2)
outFile = args[2];
else
if(args.length > 1)
outFile = "proj1.dat";
noOut("No output file specified , defaulting to proj1.dat");
inFile = args[1];
br = new BufferedReader(new FileReader(inFile));
processData();
closeFiles();
if(fileOutput && screenOutput)
printBanner();
if(args.length == 1)
outFile = "proj1.dat";
noOut("No output file specified, defaulting to proj1.dat");
System.out.println("\n" + "\n" + "Please enter an expression, or type quit");
BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
processData();
closeFiles();
else
outFile=args[1];
System.out.println("\n" + "\n" + "Please enter an expression, or type quit");
br = new BufferedReader(new InputStreamReader(System.in));
processData();
closeFiles();
Processes the input data by the user by doing the specified operations and then displays the output
private static void processData() throws Exception
if(fileOutput)
outfile = new PrintWriter(new FileOutputStream(outFile), true);
else if(fileOutput && screenOutput)
outfile = new PrintWriter(new FileOutputStream(outFile), true);
buffer = br.readLine();
while(!buffer.equals(""))
StringTokenizer reader = new StringTokenizer(buffer);
int count = 0;
String number1 = null;
String number2 = null;
String op = null;
boolean valid = true;
boolean secondNumber = true;
while (reader.hasMoreTokens())
switch(count)
case 1: number1 = reader.nextToken();
break;
case 2: op = reader.nextToken();
break;
case 3: number2 = reader.nextToken();
break;
count++;
if(number1 == null || number1.equals("quit"))
printSummary(goodCount, badCount, totCount);
closeFiles();
if(number2 == null)
secondNumber = false;
char character;
int position = 0;
String s = "0123456789/-";
for(int i = 0; i < number1.length(); i++)
character = number1.charAt(i);
position = s.indexOf(character);
if(position == -1)
valid = false;
if(secondNumber)
for(int i = 0; i < number2.length(); i++)
character = number2.charAt(i);
position = s.indexOf(character);
if(position == -1)
valid=false;
int denomin2 = 0;
int numer2 = 0;
String n1 = null;
String d1 = null;
int izerCount = 0;
StringTokenizer st2 = new StringTokenizer(number1,"/");
while(st2.hasMoreTokens())
switch(izerCount)
case 1: n1 = st2.nextToken();
d1 = "1";
break;
case 2: d1 = st2.nextToken();
izerCount++;
int numer1;
int denomin1;
int tokenCount = 0;
if(valid)
numer1 = Integer.parseInt(n1);
denomin1 = Integer.parseInt(d1);
String n2 = null;
String d2 = null;
if(secondNumber)
StringTokenizer st3 = new StringTokenizer(number2, "/");
while(st3.hasMoreTokens())
switch(tokenCount)
case 1: n2 = st3.nextToken();
d2 = "1";
break;
case 2: d2 = st3.nextToken();
tokenCount++;
numer2 = Integer.parseInt(n2);
denomin2 = Integer.parseInt(d2);
RationalNumber z1 = new RationalNumber(numer2, denomin2);
RationalNumber z = new RationalNumber(numer1,denomin1);
RationalNumber z1 = new RationalNumber(numer2,denomin2);
boolean lt = true; //whether the first number is less than the second
boolean gt = true; //whether the first number is greater than the second
boolean eq = true; //whether the first number is equal to the second
boolean le = true; //whether the first number is less or equal to the second
boolean ge = true; //whether the first number is greater than or equal to the second
boolean zeroDenom = true; //whether the denominator is zero
if(denomin1 == 0 || denomin2 == 0)
zeroDenom = true;
badCount++;
else
zeroDenom = false;
if(!zeroDenom && secondNumber)
if(op.equals("+"))
RationalNumber z2 = z.add(z1);
if(screenOutput)
System.out.println(buffer + " = " + z2.getNumerator()+ "/" +z2.getDenominator());
if(fileOutput || fileOutput && screenOutput)
outfile.println(buffer + " = " + z2.getNumerator()+ "/" +z2.getDenominator());
goodCount++;
else if(op.equals("-"))
RationalNumber z3 = z.sub(z1);
if(screenOutput)
System.out.println(buffer + " = " + z3.getNumerator()+ "/" +z3.getDenominator());
if(fileOutput || fileOutput && screenOutput)
outfile.println(buffer + " = " + z3.getNumerator()+ "/" +z3.getDenominator());
goodCount++;
else if(op.equals("*"))
RationalNumber z4 = z.mlt(z1);
if(screenOutput)
System.out.println(buffer + " = " + z4.getNumerator()+ "/" +z4.getDenominator());
if(fileOutput || fileOutput && screenOutput)
outfile.println(buffer + " = " + z4.getNumerator()+ "/" +z4.getDenominator());
goodCount++;
else if(op.equals("/"))
RationalNumber z5 = z.div(z1);
if(screenOutput)
System.out.println(buffer + " = " + z5.getNumerator()+ "/" +z5.getDenominator());
if(fileOutput || fileOutput && screenOutput)
outfile.println(buffer + " = " + z5.getNumerator()+ "/" +z5.getDenominator());
goodCount++;
else if(op.equals("<"))
lt=z.lt(z1);
if(screenOutput)
System.out.println(buffer + " is " + lt);
if(fileOutput || fileOutput && screenOutput)
outfile.println(buffer + " is " + lt);
goodCount++;
else if(op.equals(">"))
gt=z.gt(z1);
if(screenOutput)
System.out.println(buffer + " is " + gt);
if(fileOutput || fileOutput && screenOutput)
outfile.println(buffer + " is " + gt);
goodCount++;
else if(op.equals("="))
eq=z.eq(z1);
if(screenOutput)
System.out.println(buffer + " is " + eq);
if(fileOutput || fileOutput && screenOutput)
outfile.println(buffer + " is " + eq);
goodCount++;
else if(op.equals("<="))
le=z.le(z1);
if(screenOutput)
System.out.println(buffer + " is " + le);
if(fileOutput || fileOutput && screenOutput)
outfile.println(buffer + " is " + le);
goodCount++;
else if(op.equals(">="))
ge=z.ge(z1);
if(screenOutput)
System.out.println(buffer + " is " + ge);
if(fileOutput || fileOutput && screenOutput)
outfile.println(buffer + " is " + ge);
goodCount++;
else
if(op==null)
if(screenOutput)
System.out.println("Invalid expression: " + buffer);
if(fileOutput || fileOutput && screenOutput)
outfile.println("Invalid Expression: " + buffer);
badCount++;
else
if(screenOutput)
System.out.println("Invalid expression: " + buffer );
if(fileOutput || fileOutput && screenOutput)
outfile.println("Invalid expression: " + buffer);
badCount++;
else
if(screenOutput)
System.out.println("Invalid operand: " + buffer);
if(fileOutput || fileOutput && screenOutput)
outfile.println("Invalid operand: " + buffer);
else
if(screenOutput)
System.out.println("Invalid operand: " + buffer);
if(fileOutput || fileOutput && screenOutput)
outfile.println("Invalid operand: " + buffer);
badCount++;
buffer = br.readLine();
Prints the banner for the program
private static void printBanner()
System.out.println("+++++++++++++++++++++++++++++++++++++++++"+"\n"+"+Welcome to the expression connection +"+"\n"+"+++++++++++++++++++++++++++++++++++++++++");
Prints the total number of expressions, total number of valid expressions, and total number of bad expressions.
private static void printSummary(int goodCount, int badCount, int totCount)
totCount = goodCount + badCount;
System.out.println("\n");
System.out.println("+++++++++++++++++++++++++++++++++++++++++");
System.out.println("+ Total Expressions: "+totCount);
System.out.println("+ Total Valid Expressions "+goodCount);
System.out.println("+ Total Bad Expressions "+badCount);
System.out.println("+++++++++++++++++++++++++++++++++++++++++");
Prints the error message if there is no output file specified
private static void noOut(String errorString)
System.out.println("\n");
System.out.println("Proj1: " + errorString);
Prints the error message if there is an invalid option input by the user
private static void invalidOption(String errorString)
System.out.println("\n");
System.out.println("Proj1: " + errorString);
System.out.println("Proj1: Usage is: java proj1 [-fob] [input] [output]");
System.exit(0);
Prints the error message if there is a bad option input by the user
private static void badOption(String errorString)
System.out.println("\n");
System.out.println("Proj1: " + errorString);
System.out.println("Proj1: Usage is: java proj1 [-fob] [input] [output]");
System.exit(0);
Prints the error message if the input file does not exist
private static void nonExist(String errorString)
System.out.println("\n");
System.out.println("Proj1: " +errorString);
System.out.println("Proj1: Usage is: java proj1 [-fob] [input] [output]");
System.exit(0);
Closes the files used by the user
private static void closeFiles( )
if(fileOutput && !screenOutput)
outfile.close();
System.exit(0);
}Well working is good...
The code itself is less than spectacular I'm afraid. There is very little
OOness to this. For your future reference when you complete a program
and it consists of nothing but static methods you have done something
incorrectly.
As far as the code you do have goes some refactoring would be nice.
The two main methods you have (proj1 but especially processData) are
too long and unwieldy. processData seems to be a program in an of
itself. It's complicated and hard to follow.
My recommendation to you would be to read this http://java.sun.com/docs/books/tutorial/java/index.html
Especially focus on the sections dealing with explanation of Object
programming. These terms and concepts can certainly be confusing to
new programmers so you may also want to consider finding yourself a
tutor to help you get a better grasp of these concepts.
In short if it works that's good. And it's also good to see that you put the
effort and time in that you have. However if I was grading your project
I'd give it a C- at best because this is a Java program in syntax only. -
I have an eight year old IMAC with the Intel dual core. Today for the first time a fine white vertical line appeared on screen in all applications. I do not know if I did something or if this is a larger problem. Everything else seems to be working alright. Any suggestions on how to fix this problem would be appreciated. Thanks.
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Please post the "Version" under the big "Mac OS X" and the "Processor" information. These can make a big difference in advising you how to proceed.
iOS 4.1 currently shown in you profile will not run on a Mac computer; it is only for iDevices (Pads, Pods and Phones), so fixing that in your profile can help you get answers faster because people won't to ask for more info before forming an answer. -
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Please read this whole message before doing anything.
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Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test. -
I downloaded a song from i-tunes. It plays on my computer, but won't play on my i-phone. Any suggestions on how to fix this? Or how can I re-download the song without getting charged a second time. I could not find an option to "report a problem".
I could not find an option to "report a problem".
Log in to the Store. Click on "Account" in your Quick Links. When you're in your Account information screen, go down to Purchase History and click "See all".
Find the item that is not playing properly. If you can't see "Report a Problem" next to the entry, click the "Report a problem" button. Now click the "Report a Problem" link next to the item.
(Not entirely sure what happens after you click that link, but fingers crossed it should be relatively straightforward.) -
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I suspect the drive got disconnected, somehow, on that other system and corrupted the drive because of the Disconnection.
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ThanksHi there, i bought an Ipad air and trying to upload the pictures that i have taken in raw files via itunnes. however pictures are quite blurry which is disappointing. Appreciate any suggestions on how to make it right via itunes?
Thanks -
My iMac freezes and sometimes shuts down on its own. Any suggestion on how to fix this? Thanks.
My iMac freezes and sometimes shuts down on its own. Any suggestion on how to fix this? Thanks.
Might want to run the Apple Hardware Test just in case.
Intel-based Macs: Using Apple Hardware Test
If the hardware checks out ok the startup disk may need repairing.
Follow the instructions for Using Disk Utility to verify or repair disks -
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If Ralph's suggestion doesn't work, try a Restore. Note that it's nowhere near as quick as a Reset. It could take well over an hour! Connect via cable to the computer that you use for sync. From iTunes, select the iPad/iPod and then select the Summary tab. Follow the on-screen directions for Restore and be sure to say "yes" to the backup. You will be warned that all data (apps, music, movies, etc.) will be erased but, as the Restore finishes, you will be asked if you wish the contents of the backup to be copied to the iPad/iPod. Again, say "yes."
At the end of the basic Restore, you will be asked if you wish to sync the iPad/iPod. As before, say "yes." Note that that sync selection will disappear and the Restore will end if you do not respond within a reasonable time. If that happens, only the apps that are part of the IOS will appear on your device. Corrective action is simple - choose manual "Sync" from the bottom right of iTunes.
If you're unable to do the Restore (or it doesn't help), go into Recovery Mode per the instructions here. You WILL lose all of your data (game scores, etc,) but, for the most part, you can redownload apps and music without being charged again. Also, if you have IOS-7, read this. -
When I try to download a song or a video on my ipad it starts to download and then before it finishes it stops and says download error. Tap to retry. Any suggestions on how to fix this error and get my items that I purchased to download?
MacBook Airs won't run Classic.
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