I want to input character data from the console without using the BufferedReader class. I tried using the Scanner class but the compiler shows an error. This is what I tried:
sc.nextCharacter();
sc.nextcharacter();
sc.nextChar();
Sc.nextchar();
Is there any way I can input character data without using the BufferedReader class?
I am having a great deal of frustration trying to use the scanner to get user input from the eclipse console. Here is what I am trying to do.
Print a menu for the user with options, take that (1) char input and run it into a switch statement for processing. I have that done and it is working fine.
If the user chooses to enter strings for storage, They are instructed to enter their string and press enter to complete that string entry. Then enter the next string and press enter, etc.
So I have a While loop for this. Get the scanner input, store it in the LinkedList, get the next scanner input, etc. I get the scanner string and store it in a Linked list. That works fine. The user is instructed to simply enter a blank string to end the entry procedure, like just press Enter on the new line without typing a new string.
The problem is the scanner doesn't seem to return anything for me to Test to close this procedure. How do I TRAP the fact that the user just pressed enter so I can end my procedure? I have tried next() and nextLine() and reset(), etc. And I am getting knowhere.
I have this very simple application just to test console input:
import java.util.ArrayList;
import java.util.Scanner;
public class WriteTester {
[Code]....
When I let it run, only every third entry is put into the array list and I have to hit "enter" three times for the "break" in line 21 to trigger. I cannot find out why.
I am trying to make a program in which first I am entering number of charachters and then in nextline their is exactly that number of characters should be enter after than program should stop taking input from console..this is I have try so far
private static ArrayList<String> chars;
static String inputdata;
public static void main(String[] args) {
Scanner in=new Scanner(System.in);
chars=new ArrayList<String>();
[code]....
this is my code...in my code i cant give input form my console...it takes input but it doesn't save in a target file..My code is :-
package filetester;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
[code]....
I am currently tackling homework for a small I/O-program with console input.Right now, only the part when you enter "E" or "e" on the console is implemented and the issue I am trying to tackle is described in the comment starting at line 38:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Vector;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.InvocationTargetException;
import java.util.Scanner;
[code]....
I'm having an issue, I have a scanner (Scan.nextLine();) that scans the console for input to fetch the string "word". Then I want to fetch a character using Scan.findInLine(word).charAt(number);. The problem is that the console requires me to write 2 lines in order for the program to move on. I only want the program to scan for a word, and then move on with what it has instead of requiring 2 inputs.
View Replies View RelatedBy using FileReader, FileWriter and their constituents, I am creating a file to contain employee information ( name, age, hours, etc. ). The user is to input all of the data on a single line and we were asked to implement StringTokenizer to assign that data to the file. I have never used the StringTokenizer before, but I have a rough idea how it is to function. I used pw.println to test what I have so far, now I would like to let the user build the initial file with the "first employees" of the company, and then view the file, and then go back and append new employee data to that same file. My question is, how can I take the user input as a StringTokenizer and add that to the file?
In the for loop below, I thought I would see if it would work, but it does not. The loop only executes once and does not allow me to enter data.
public class Records {
public static void main(String [] args) throws IOException {
Scanner input = new Scanner(System.in);
FileWriter fw = new FileWriter("dbs3.java");
BufferedWriter bw = new BufferedWriter(fw);
PrintWriter pw = new PrintWriter(bw);
System.out.println("NEW EMPLOYEE DATA SHEET");
System.out.print("Number of new employees: ");
int number = input.nextInt();
[Code] ....
Write a program that allows the user to enter students names followed by their test scores and outputs the following information(assume that the maximum nmber of students in the class is 50; if the number of students is less than 50, to indicate the end of input data, after entering the last students data, on a line by itself, hold the ctrl key/press z and then press the Enter key):
a) Class average
b) Names of all the students whose test scores are below the class average, with an appropriate message( youre below class average)
c) Highest test score and the names of all the students having the highest score.
Use methods.
Now I wrote the program but i cant figure out how to end the input by pressing ctrl key/press z and then press the Enter key...
Here is my code
import java.util.Scanner;
public class ClassAverage {
public static void main(String args[]) {
String names[] = new String[50];
[code]....
I mean i need to access to two txt file at the same time so i did this in method:
DataInputStream din= new DataInputStream(FileInputStream("vip.txt"));
DataInputStream din2= new DataInputStream(FileInputStream("corporate.txt"));
But there are errors when i compile and they pointing to these two lines.
I am trying to create a Community Theater program that has Actors, Directors, Investors, Staff etc. I should eventually be able to input the information for the people from both a file and the keyboard. I'm working on trying to take in multiple Actors from one file and adding them to an ArrayList of Actors. My code takes in only one actor right now.
I am trying to take in multiple sets of data for the same type of class but creating new instances after each set of data (16 lines). Each actor has 16 lines of data (text file included), so I was thinking that I would need perhaps a for loop but I am unsure of how and where to implement it. I am also unsure about adding these new actors to the Actor ArrayList. I'm a little shaky on the idea of creating multiple objects when it is unknown how many you need to create. Right now, I know how many Actors I need to add but it would be nice if I could learn how to expand that based on the user's needs.
My Questions:
How can I write my program to know when it is done reading 16 lines and then initialize a new Actor (will expand to other people)?(expanded below)Eventually, I plan on using my theaterObj (an instance of CommunityTheater class), what if I wanted to move the readActorFile method to that class? Would that change the way I implement anything majorly? Would it still be a static method? I ask this because I want the Actors array to be a variable in the CommunityTheater class. I would extend this to adding actors to an ArrayList in a Play class which would be in CommunityTheater as well. So, essentially a CommunityTheater has different Play(s), and each Play contains a list of Actors.
I don't exactly know where I should put a loop (should I use a loop?) to read through each line, in readActorFile or in readInFile? How should I write this loop, as in, how do tell my program what line it's reading?
for(countLine=0; countLine < 17; countLine++) or while(countLine<17)
read all the info
and then an if(?)-
if(file has a next line)-I don't really know how to code this-start over with loop of reading information?I don't know about the for loop, as I'm not sure how to "count" lines in a text file.OR I've been thinking that readInFile in the Actor class could return something(true/false?) to let the method readInActor know that it's done reading, then readInActor can check to see if there's anything else in the file, if there is- it would call the readInFile in Actor class again to read in information... and so on. But again I am unsure of how to code this.
My problem is that in my program, I have the user input data for one of three product objects, however when I read the data for all three objects, the same data is stored in all of them.
Anyway this is the method from the Interface class:
private void readInput() // the only method in the program that accepts product data from the user {
Store matesStore = new Store();
String name;
int demandRate, productChoice;
double setupCost, unitCost, inventoryCost, sellingPrice;
Scanner console = new Scanner(System.in);
[Code] ....
And here is the method from the Store class:
public static void addData(int option, String newName, int newDemand, double newSetup, double newUnit, double newInventory, double newPrice)
//sets the product data for a particular product {
if (option==1) setData(product1, newName, newDemand, newSetup, newUnit, newInventory, newPrice);
else if (option==2) setData(product2, newName, newDemand, newSetup, newUnit, newInventory, newPrice);
else /*(option==3)*/ setData(product3, newName, newDemand, newSetup, newUnit, newInventory, newPrice);
[Code] ....
The problem I had was with static variables and methods.
I need to take the users input from 2 boxes and reference that to a sqlite database and populate the fields with the data in the database. I know the database code work.
Here is the code for the "user" form;
Java Code:
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTextField;
import java.awt.Font;
[Code] .....
I a simple server that receives bytes using TCP and then saves them to a file stream.Through many tests I have seen that the first packet received is always just the filename with no other data. The second packet received only has one byte and it is the first letter of the input text file. After this all packets are sent correctly, but I can't seem to figure out what is messing up the second packet. It also appears that the last packet is written twice.
Here is an example Input/Output: [URL] .....
InputStream in = clntSock.getInputStream(); //server's input stream - gets data from the client
OutputStream out = clntSock.getOutputStream(); //server's output stream - server sends data to the client
byte[] byteBuffer = new byte[BUFSIZE];
int count = in.read(byteBuffer, 0, BUFSIZE);
String firstRead = new String(byteBuffer, 0, count);
[Code] ....
Another peculiarity to me is that the second to last packet is always just "-" and then the last packet has the remainder of the magic string which terminates the file output stream.
I am aware that it is not safe to make the assumption that the file name will be sent in one go before the loop, but I wil fix that later. I am not concerned about it at all now. THe problem si that the loop should account for any amount read in, but for some reason the first packet always contains one letter, and the second packet picks up around 16000 bytes later for some reason. Why would this be?I can't edit my above post so here is the code with code tags.
InputStream in = clntSock.getInputStream(); //server's input stream - gets data from the client
OutputStream out = clntSock.getOutputStream(); //server's output stream - server sends data to the client
byte[] byteBuffer = new byte[BUFSIZE];
int count = in.read(byteBuffer, 0, BUFSIZE);
String firstRead = new String(byteBuffer, 0, count);
[Code] ....
We are currently trying to use the "confirm" button on our GUI as a fully functioning feature that saves the data input into a database. Here is the code for the GUI we have created...
We are trying to save some details of users for a database.
I've attached our work in zipped folder as i couldn't upload a thread with some many "URLs" .....
I am creating a calculator in which a user will directly input the numbers and the operator...
Here is my code:
int answer = 0;
int num1, num2;
char operator;
System.out.print("Enter calculation: ");
num1 = kb.nextInt();
operator = kb.next().charAt(0);
num2 = kb.nextInt();
The code above will accept the user input when there are spaces like this: 1 + 1
So the program will give an answer which is 2...BUT
if i input 1+1 it will give an error...Exception in thread "main" java.util.InputMismatchException
How can i do that it will separate integer to character? because i set the operator as character....
So that it will accept one digit to several digit numbers... like 500+84 or 1520+872??
Iam trying to upload jpeg image.
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
[Code] ....
In servlet the below code
DataInputStream din = new DataInputStream(request.getInputStream());
byte[] data = new byte[0];
byte[] buffer = new byte[50];
int bytesRead;
while ((bytesRead = din.read(buffer)) > 0 ) {
byte[] nData = new byte[data.length + bytesRead];
System.arraycopy(data, 0, nData, 0, data.length);
System.arraycopy(buffer, 0, nData, data.length, bytesRead);
data = newData;
}
What i see is servletinput stream does't have any values.It does't even enter while loop.
So I was just wondering if it's possible to create a program with JAVA that uses an algorithm to summarize data inputed. I've never done something like this before, If this is not possible with Java is it possible with C++ or any other language??
View Replies View RelatedI am writing a code in which a user inputs data as a string and that data must be verified as a valid number. A valid number is anything from 0-100. Then all valid numbers are converted into double numbers.
I am having trouble in how to write the validation part of the code.
Is it suppose to be an if, else statement? And if so how is it suppose to be validated?
Trying to run my program after getting rid of code errors (I think) and now it doesn't produce anything but <terminated> in the console window. The produce is suppose to analyse text from a file and produce the percentage of words used
package com.project;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.math.BigDecimal;
[Code] ....
erfrf.jpg
This is my program. All is working fine except stopping reading from console. Problem is that even after you write done if you are fast enough you are able to write more. As you can see I can't close scanner because of two inputs. Even so I tried to close it but problem was still here.
public static void main(String...args) {
System.out.println("Write first input:");
System.out.print(streamToString(System.in, ""));
System.out.println("Write secondinput:");
System.out.print(streamToString(System.in, ""));
[Code] .....
How to clear console screen ? I am using Linux machine.
1) Runtime.getRuntime().exec("clear"); // this is not working. Not clearing the screen
2) for ( int i = 0; i < SOME_NUMBER; i++)
System.out.println();
2nd way is working but i think it is not a good option as i need to move scroll bar again and again.
i need to take a txt file and turn it into a csv(comma seperated value) output on console but where to begin.
View Replies View Related"Write a java application that displays the following patterns separately one below the other.
Use for loops to generate the patterns. There are 4 Triangle patterns.
All asterisks (*) should be printed by a single statement of the form System.out.print('*');
This is 4-different patterns, not 1-pattern."
The first 2 triangles are right angles and is simple to make with a loop with in a loop
The 3rd triangle is like an inverted christmas tree and the 4th one is a christmas tree. ( It's not showing properly on the board so i deleted it). I can't seem to make the 3rd and 4th triangle line up properly it looks like this (the _ represents blank spaces on the console)
_____*_____
_____**_____
____***_____
____****_____
___*****____
___******_____
__*******
__********____
Notice how the sides of the triangle isn't straight and the triangle looks like its dancing, the assignment requires it to be a straight line. is there anyway to do this? This is suppose to be the output. all the lines of the triangle is straight and not jagged ...
public class myclass {
public static void main(String[] args) {
int counter = 1;
int counter2 = 1;
while (counter != 11){
EmptyLine();
[Code] .....
My code for those particular triangle is in the work because I cant figure out how to make it look like that.
I have a multithreaded java program. I have a few worker threads which process data over a udp server. Then I have another thread for console input. The problem is when there is an error with one of the worker threads, and it prints to the console, my console thread loses "focus", that is, the while loop seems to no longer run. Here is the console thread:
Java Code:
public void run() {
Console c = System.console();
if (c == null) {
Logger.writeError("No console.");
System.exit(1);
}
while(true){
String login = c.readLine(">>>: ");
System.out.println("You entered: " + login);
}
} mh_sh_highlight_all('java');
When an exception is raised, it prints it to the console, and suddenly the program no longer shows the >>> prompt from above.
I seem to be having a issue with my java console app what it should do is query a SQL DB and list the user details (userid, firstname ,lastname) from the user table, and the users stocks (stockname ,stockdiscription) associated to each user from the userstocks table if I'm thinking correctly!
I'm sure it is just a logical error, but I'm not sure of the way to get the out put I'm looking for. I will add the makeDB.java file and DatabaseQuery.java file as well as the current Exception(Run Time Exception) below.
**I have added other users and stocks manually - Not just what the MakeDB.java file inserts **
Output and Exception:
Stock holdings by User
User ID User Name
Stock - Description
-------------------------------------------
admin01 Default Admin
Exception in thread "main" java.sql.SQLException: ResultSet is closed
at sun.jdbc.odbc.JdbcOdbcResultSet.checkOpen(JdbcOdbcResultSet.java:6647
)
at sun.jdbc.odbc.JdbcOdbcResultSet.next(JdbcOdbcResultSet.java:1248)
at DatabaseQuery.main(DatabaseQuery.java:45)
Press any key to continue . . .
Java Code:
MakeDB.java:
import java.sql.*;
import java.io.*;
public class MakeDB
{
public static void main(String[]args) throws Exception
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
[Code] ....