I/O / Streams :: Unable To Create A Print Writer To Write To File
Apr 25, 2014
I am completing a USACO online problem and am trying to create a print writer to write to my file(ride.out). I did this:
PrintWriter out = new PrintWriter(new BufferedReader(new FileWriter("ride.out")));
However, a load of undefined constructor errors come up for PrintWriter(BufferedWriter) and BufferedWriter(FileWriter). I have imported java.io.* so I don't know what the issue is. This has worked before.
My code below creates the 2 files successfully, but it is not able to write the sample data into the newly created file. I can't figure out the reason why.
Another strange thing is that when I tried inserting System.out.println calls for debugging, nothing prints out.
is my current exercise.so far i have gotten the code to create a file, and ask the user to input their age.what should i use to save what the user writes into the file?
Java Code:
package assignment7; import java.io.*; import java.util.*; public class Exercise2 { public static void main ( String [ ] args ) throws IOException { Scanner scan = new Scanner(System.in);
I am trying to write to an output file that the user names. I have flushed and closed the printwriter, so now I am at a loss. The console output works fine with the formatting, and the file is created, but I cannot get the file to populate. I have the following:
public static void main(String[] args) {
try { Scanner kb = new Scanner(System.in); System.out.print("Input file: "); String inputFileName = kb.next(); System.out.print("Output file: "); String outputFileName = kb.next(); // Construct the Scanner and PrintWriter objects for reading and writing File inputFile = new File(inputFileName); Scanner in = new Scanner(inputFile); PrintWriter out = new PrintWriter(outputFileName);
I'm getting an IllegalArgumentException returned when I try to get a file using guava library.
I previously had the function working when the file was in a different location, before I switched to running JBehave, my steps run but it fails to find the resource, even after I've moved it.
The code being executed is (this worked previously before using JBehave):
The file I'm looking for is in the root folder for src/main/resources and also src/test/resources, previously I had it within a completely different location before I switched over to JBehave. I've tried it within a subdirectory in the same locations too.
I've recently updated the pom.xml to try to include the location required.
I've been working on a saving system for a game I'm working on using java IO writer and reader. When I tried exporting it (as a executable jar) to test I couldn't get it to work, when it worked before. If I had to guess it's the file location not being able to find the file. Which it just looks like :
FileReader end = new FileReader("Saves.txt");
I don't exactly know how to set it up to read the file. I'd tried giving it a look up but I don't know how to exactly word my problem.
I am trying to create a java file that will print out the temperature in Fahrenheit. This is my code.
import java.util.Scanner; public class TemperatureConverter { public static void main(String[] args) { float temperature; Scanner in= new Scanner(System.in); System.out.printf("Enter temperature in degrees Celsius: "); temperature = in.nextInt(); //Getting a red X next to this line. fahrenheit = temperature * 9/5 +32; //Add this line System.out.printf(+temperature + " degrees Celsius is " + fahrenheit + " degrees Fahrenheit."); //System.out.println(temp1 + " degrees celsius is " + fahrenheit + " degrees Fahrenheit."); } }
I need to know what I am doing wrong. Using Eclipse as my platform. I have entered comments where I am getting red X's.
The error I get when I run the program.
Exception in thread "main" java.lang.Error: Unresolved compilation problems: fahrenheit cannot be resolved to a variable fahrenheit cannot be resolved to a variable at TemperatureConverter.main(TemperatureConverter.jav a:24)
I am using netbeans to create a hotel booking system, just tessting out code to get the booking information input to a file when the next button is clicked.
public class Lab12 { public static int SumRow(int [][] a){ int row, column, sum=0; for (row=0;row<2;row++ ) { sum=0; for (column=0;column<2;column++) { sum=sum+a[row][column];
[Code]...
my output is
The sum of row 1 is: 3 The sum of coloumn 0 is: 5 The sum of coloumn 1 is: 5 The max of row 0 is: 4 The max of row 1 is: 2
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.Find the sum of all the multiples of 3 or 5 below 1000.
public class ClassEcerciseOne { public static void main(String[] args) { // TODO Auto-generated method stub int x=0; int y=0; for (x=0;x < MAX_VALUE;x++){ if (x/3==0){ System.out.println(x); int z= x++;
I am creating a web application that runs on server X(unix) and it has another unix system mounted on it. I want to generate the file tree structure of this mounted unix file system and show it on to a web application so that users can select a file and move it onto this current unix machine.
I know this sounds stupid and you may want to say why cant we directly copy the file, I am doing a proof of concept and using this as a basis.
i am trying to print out a randomly generated array, but i only get
[I@7852e922
i did some research and the "[" is for arrays, "I" is for the int and "@" is the hash. and the rest is some sort of hex. I need to override this in a way, but i can't seem to find out how. this is my current code:
import java.util.Random;
public class Oppgave { public static void main(String[] args){ int myint[] = fyll(); System.out.println(myint); } public static int[] fyll() {
I have a problem where i have to write some code to read through an int array and print out the different integers and how many times they occur. For example:
if the array contained the numbers 1,4,2,3,5,4,4,7,5,4,3,6,8,6,4,
i would need the print to appear something like this
as the array is read sequentialy from element 0 to the end. the program should find the integer value in the first element (increment a counter by 1) and then search all other elements to see if the integer reoccurs (counter++ for each time it reappears). obviously the counter would be the 'times' value in the second column.
My problem is i can get this accomplished yet i cant get the program to recognise when it has already registered an integer in a previous element and skip to the next element looking for a new integer. SO for each element in the array it prints the integer and then searches the entire array for the integer again and increments the counter accordingly. so in essence there is a line printed for each integer the number of times it actually occurs.
I simply wish to have my code to find an integer and the number of times it occurs. and then disregard the elements it has registered the previous integer in.
Also, keep in mind that i am NOT permitted to use any new data structures/arrays for storing/remembering values. I can only use int and double variables throughout.
what i have so far is this: with the array being customerID[] :
Java Code:
int num; int counter; for(int count = 0; count < customerID.length; count++) { counter = 0; num = customerID[count]; for(int count2 = 0; count2 < customerID.length; count2++)
[Code]...
The output for the int array 1,1,3,0,3,2,0,4,1,3, looks something like this:
and as you can see lines are repeated for each time the same integer occurs in a new element. i just need my code to skip an element if the integer has been previously encounterd and recorded. i.e i need it to look more like this :
with the first encountered integer being checked throughout the array and then moving to the next integer/element which is not the same as any previous.
I'm trying to print out the results of a program that calculates the number of seats the parties will get in an election.I have to print the partial results and the national results.
I can print te number of seats per party in each constituency, but how can i sum all seats per party in each constituency and print the national results?I'm working with vectors, which I know it might not be the best option, but everything is working, except the fact that I can't loop throuhg the vector and retrieve the total sum per party.Like, adding the seats for labour party in Constituency A and B and C, etc, and print the sum. And do the same for conservative party.Is it possible, or doIhave to create a method in Parties class to solve the problem?
This is what I have now.
for (Parties p : h.geral) { show += String.format("Constituency - %5s - %5s - %d%n", p.getConstituency(), p.getParty(), p.getNum_seats()); }
I am trying to create an MP3 player with a totally customized look and feel to it. I know how to do this with .net, but I must be missing something in Java.
I want to be able to NOT have to present the user with the default mediaPlayer.getControlPanelComponent() in order to control the media player. I want to be able to code it to when the user clicks on my "Play" button, I can tell the player to play the song, and so on.
