My program consists of several options of what to do with user input data about shows (name, day, time). One of the options is to read a file and display its content to the user. Although this section of my program is working, it isn't displaying correctly (As shown below). Should I make changes to how the program reads the file? If there are any suggestions on what I should change about my code, I would truly appreciate it! Thank you.
Here is my code:
//Method loadShows
public static void loadShows() throws IOException {
//String to find file
String findFile, file;
//ask for location of file
System.out.println("Enter Show File Location: ");
//Read input
findFile = in.readLine();
file = findFile + "/show.txt";
BufferedReader input = new BufferedReader(new FileReader(file));
x = Integer.valueOf(input.readLine()).intValue();
System.out.println("Loading " + x + " Shows");
for(i = 0; i<=(x-1); i++) {
name[i] = input.readLine();
day[i] = input.readLine();
time[i] = input.readLine();
}
for(i = 0; i<=(x-1); i++) {
System.out.println("Name : " + name[i]);
System.out.println("Day : " + day[i]);
System.out.println("Time(2:30 am = 0230) : " + time[i] + "\r");
}
}
Here is the output:
Enter Show File Location:
C:\Users\OneDrive\Desktop\MyFirstJavaProject
Loading 3 Shows
Name : //***As you can see it isn't in order, or displayed correctly***
Day : Suits
Time(2:30 am = 0230) : Monday
Name : 0130
Day : The Flash
Time(2:30 am = 0230) : Thursday
Name : 0845
Day : National Geographic
Time(2:30 am = 0230) : Sunday
Here is my file content:
3
Suits
Monday
0130
The Flash
Thursday
0845
National Geographic
Sunday
0525
You can do with only one for:
public static void loadShows() throws IOException {
BufferedReader br = new BufferedReader(new FileReader("C:\\Users\\adossantos\\file.txt"));
try {
StringBuilder sb = new StringBuilder();
String line = br.readLine();
while (line != null) {
sb.append(line);
sb.append(System.lineSeparator());
line = br.readLine();
}
String everything = sb.toString();
String[] values = everything.split("\n");
for(int i = 0; i < values.length; i+=3) {
if(i + 3 > values.length - 1 )
break;
System.out.println("Name : " + values[i + 1]);
System.out.println("Day : " + values[i + 2 ]);
System.out.println("Time(2:30 am = 0230) : " + values[i + 3] + "\r");
}
} finally {
br.close();
}
}
Response:
Related
I am trying to figure out how to make a grep method that can read wrapped phrases from up-to infinity lines(That is a sentence or string spanning multiple lines of a given text file) in java. Here is my current code for the grep function:
public static void grep() throws IOException{
BufferedReader f = new BufferedReader(new FileReader("Cabbages.txt"));
Scanner in = new Scanner(System.in);
String line = "", input = "", wrappedPhrase = "", modified = "";
int c = 0, foundCount = 0;
boolean found = false;
System.out.print("Please enter something you want to grep: ");
input = in.nextLine();
while((line = f.readLine()) != null) {
c++;
found = false;
int index = line.indexOf(input);
while(index >= 0) {
modified = "<" + line.substring(line.indexOf(input), (line.indexOf(input)+input.length())) + ">";
found = true;
index = line.indexOf(input, index + 1);
foundCount++;
}
if(found) {
System.out.println("Found on line: " + c + ", which is: " + line.replace(input, modified));
}
}
if(foundCount <= 0) {
System.out.println("Sorry, the input string of: \"" + input + "\" was not found within the given file.");
}else {
System.out.println("In total, the input string of: \"" + input + "\"" + " was found " + foundCount + " time(s).");
}
}
I am creating a Premier League football table in my spare time and I have come across a problem. While the program runs I want it to be perfect and output in the format I want it to, the problem is:
You enter the the Input (" HomeTeam : AwayTeam : HomeScore : AwayScore ") as follows
When you are done with the list you enter "quit" to stop the program
My issue is that the scores come out like this
(" HomeTeam | AwayTeam | HomeScore | AwayScore ")
I intend it to print like this (" HomeTeam [HomeScore] | AwayTeam [AwayScore] ")
I have tried many variations of System.out.printlns to no avail, even trying to make several Boolean conditions that will output the input in the way I want it too. I am truly at a loss and it is frustrating - I hope that someone can give me tips the code is attached
Edited for loop;
for (int i = 0; i < counter; i++) { // A loop
String[] words = product_list[i].split(":");
System.out.println(words[0].trim() + "[" + words[2].trim() + "]" + " | " + words[1].trim() + "[" + words[3].trim()) + "]";
This should work:
Scanner sc = new Scanner(System.in);
public void outputScore(String input) {
String[] words = input.trim().split("\\s+");
String satisfied = sc.nextLine();
if (satisfied.equals("quit")) {
System.out.println(words[0] + " [" + words[4] + "] | " + words[2] + " [" + words[6] + "]");
}
}
This is what the method should look like when you call it:
outputScore(sc.nextLine());
Here is the code to your edited question:
String [] product_list = new String [100];
int counter = 0;
Scanner scanner = new Scanner(System.in);
System.out.println("Input as follows:");
System.out.println("Home team : Away team : Home score : Away score");
String line = null;
while (!(line = scanner.nextLine()).equals("")) {
if (line.equals("quit")) {
break;
} else {
product_list[counter] = line;
System.out.println("Home team : Away team : Home score : Away score");
}
counter++;
}
for (int i = 0; i < counter; i++) {
String[] words = product_list[i].split(":");
System.out.println(words[0].trim() + " : " + words[2].trim() + " | " + words[1].trim() + " : " + words[3].trim());
}
Hope this helps.
I made a code for my system which would update a record in my text file database but I cant seem to make it work. The code doesnt have any error. its just not doing what I intend it to do
public static void Update() throws Exception {
File tempfile2 = new File("temp.txt");
tempfile2.createNewFile();
FileInputStream tempFStream = new FileInputStream(tempfile2);
BufferedReader read = new BufferedReader(new InputStreamReader(tempFStream));
System.out.print("Product Number: ");
String searchnum = br.readLine();
try {
LoadFile();
boolean found = false;
for (int i = 0; i < row; i++) {
String record[] = list.get(i).split(",");
if (!searchnum.equals(record[0])) {
found = true;
FileWriter fw = new FileWriter(tempfile2, true);
fw.write(record[0] + "," + record[1] + "," + record[2] + "," + record[3] + "," + record[4] + "," + record[5] + "\r\n");
fw.close();
}
}
for (int i = 0; i < row; i++) {
String record[] = list.get(i).split(",");
if (searchnum.equals(record[0])) {
found = true;
System.out.println("\t\t\t*******************************");
System.out.println("\t\t\t PIXBOX PHOTOBOOTH");
System.out.println("\t\t\t*******************************");
System.out.println("\n\t\t\tRecord Found:");
System.out.println("\n\t\t\tProduct Number : " + record[0]);
System.out.println("\t\t\tCategory : " + record[1]);
System.out.println("\t\t\tProduct Name : " + record[2]);
System.out.println("\t\t\tPrice [m/d/y] : " + record[3]);
System.out.println("\t\t\tQuantity : " + record[4]);
System.out.println("\n\n\t\t\t--------------------------------");
System.out.print("\t\t\tAre you sure you want to replace the records?<Y/N>: ");
String del = br.readLine();
if (del.equals("Y") || del.equals("y")) {
LoadFile();
System.out.println("\t\t\t*******************************");
System.out.println("\t\t\t PIXBOX PHOTOBOOTH");
System.out.println("\t\t\t*******************************");
System.out.println("\n\n\t\t\t------Update Record Form------");
System.out.print("\n\n\t\t\tProduct Number : ");
int prodnum = Integer.parseInt(br.readLine());
System.out.print("\t\t\tCategory : ");
String cat = br.readLine();
System.out.print("\t\t\tProduct Name :");
String prodname = br.readLine();
System.out.print("\t\t\tPrice: ");
String price = br.readLine();
System.out.print("\t\t\tQuantity : ");
String quan = br.readLine();
read.close();
database.delete();
boolean rename = false;
if (rename = tempfile2.renameTo(database)) {
InsertRecords(prodnum, cat, prodname, price, quan);
System.out.println("\t\t\tSuccessfully Edited!");
exiting();
} else {
System.out.print("Edit Failed!");
}
} else if (del.equals("N") || del.equals("n")) {
MainMenu();
}
}
if (!searchnum.equals(record[1])) {
System.out.println("\n\t\t\tNo Record Found.");
Thread.sleep(2000);
exiting();
}
}
} catch (Exception e) {
System.out.print("File Empty!");
}
}
public static void LoadFile()throws Exception
{
list.clear();
FileInputStream fis = new FileInputStream(database);
BufferedReader read = new BufferedReader(new InputStreamReader(fis));
row = 0;
while(read.ready())
{
list.add(read.readLine());
row++;
}
read.close();
}
Everytime I run this... it would work until Product Number: User input and after entering a number it would directly display File is empty which is at the end of the program. its as if the try/catch is ignored. I definitely did something wrong but I dont know what I did wrong. Anyone shed me some light? Thanks
and with the e.printStackTrace(); here's what displayed after entering a product number...
java.lang.ArrayIndexOutofBoundException:5
at SnackTimeInventorySystem.Update<SnackTimeInventorySystem.java:525>
at SnackTimeInventorySystem.MainMenu<SnackTimeInventorySystem.java:66>
at SnackTimeInventorySystem.Login<SnackTimeInventorySystem.java:369>
at SnackTimeInventorySystem.main<SnackTimeInventorySystem.java:14>
Turns out I only had 5 entries on my array but declared 6 entries to be written
System.out.println("\t\t\t*******************************");
System.out.println("\t\t\t PIXBOX PHOTOBOOTH");
System.out.println("\t\t\t*******************************");
System.out.println("\n\t\t\tRecord Found:");
System.out.println("\n\t\t\tProduct Number : " + record[0]);
System.out.println("\t\t\tCategory : " + record[1]);
System.out.println("\t\t\tProduct Name : " + record[2]);
System.out.println("\t\t\tPrice [m/d/y] : " + record[3]);
System.out.println("\t\t\tQuantity : " + record[4]);
System.out.println("\n\n\t\t\t--------------------------------");
fw.write(record[0] + "," + record[1] + "," + record[2] + "," + record[3] + "," + record[4] + "," + record[5] + "\r\n");
So I just had to delete record[5] and fixed the problem thanks to Tom
im making a java file that can read a text file of football results some of which are invalid. The text file looks like this :
Chelsea : Manchester City : 2 : 1
Manchester United : Stoke City : 5 : 0
West Ham United : Middlesbrough : 2 : 2
Aston Villa:Fulham:4:1
Hull : :2:5
Arsenal Liverpool :2:2
The code must print out how many valid Array lines there are like the top 3 and also how many are invalid like the bottom 3... This is what I have so far:
public void showResults(){
String separator = ":";
File inputfile = new File ("valid.txt");
String[] StrArray;
String aLine = "";
System.out.println ("Home "+"\tHome points" + "\t Away " + "\t Away points \n____________________________________________" );
try {
Scanner filescan = new Scanner(inputfile);
while (filescan.hasNext()){
aLine = filescan.nextLine();
StrArray = aLine.split(separator);
if (StrArray.length == 4){
System.out.println (StrArray[0] +"\t" + StrArray [2] + StrArray[1] + "\t" + StrArray[3]);
}
}
filescan.close();
Any help would be welcomed i'm struggling a bit here, thanks in advance
Call split(":") on every line. If the resulting array contains an empty string then it's invalid.
And by empty I mean "" or " ". Anything with no characters in it.
this mean this
String separator = ":";
File inputfile = new File ("input.txt");
String[] StrArray;
String aLine = "";
System.out.println ("Home "+"\tHome points" + "\t Away " + "\t Away points \n____________________________________________" );
try {
Scanner filescan = new Scanner(inputfile);
while (filescan.hasNext()){
aLine = filescan.nextLine();
StrArray = aLine.split(separator);
if (StrArray.length == 4 && !StrArray[0].isEmpty()
&& !StrArray[1].isEmpty() && !StrArray[2].isEmpty()
&& !StrArray[3].isEmpty())
{
System.out.println (StrArray[0] +"\t" + StrArray [2] + StrArray[1] + "\t" + StrArray[3]);
}
}
filescan.close();
}
catch (Exception e)
{
e.printStackTrace();
}
I have a task:
"Send integers n [1 .. 10] from command line. Enter n rows to the Console, find the shortest and the longest line. Print the results and line length."
My idea is: Create array of strings and copy every line from BufferedReader to the array data[i]. Sample of my code:
String[] data = new String[n];
int j=0;
for (int i = 1; i <= n; i++) {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Please, enter " + i + " string: ");
String line = in.readLine();
for (int j=0; j<=data.length;j++){
data[j] = line;
j++;
} ///:~
System.out.println("Your " + i + " string : " + data[j] + "String len: " + line.length());
} ///:~
But I could not find the way how to fill elements of array data[i] with new line from console.
Can you please give me a small hint?
To fill data, just replace the inner for-loop with a simple assignment using index i-1:
for (int i = 1; i <= n; i++) {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Please, enter " + i + " string: ");
String line = in.readLine();
data[i-1] = line;
System.out.println("Your " + i + " string : " + data[i-1] + "\nString len: " + line.length());
}
I left the loop from 1 to n instead of 0 to n-1 because you're printing i.
But if you only want the shortest and longest lines, there's no need to store all the lines, you only need to check the length of the current line against the length of the shortest and longest lines and change them appropriately.
the easyst way is
data[i-1] = in.readLine();
Thank you all for all your Help :)
Here is my example:
package taskstring;
import java.io.*;
public class TaskString {
public static void main(String[] args) throws java.lang.Exception {
int n = Integer.parseInt(args[0]);
if (n <= 0) {
System.out.println("Wrong! please send more numbers to java");
return;
}
System.out.println("Enjoy! You are going to send " + n + " string(s) to java");
int maxLen = 0;
int minLen = 0;
for (int i = 1; i <= n; i++) {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Please, enter " + i + " string: ");
String line = in.readLine();
System.out.println("Your " + i + " string : " + "String len: " + line.length());
if (maxLen < line.length()) {
System.out.println("New string is bigger");
maxLen = line.length();
} else {
System.out.println("New string is smaller");
}
if (minLen > line.length() || minLen == 0) {
System.out.println("New string is smaller" + " minLen=" + minLen);
minLen = line.length();
} else {
System.out.println("New string is bigger");
}
//return;
} ///:~
System.out.println("Max row: " + maxLen + "\nMin row: " + minLen);
} ///:~
}