I've got a .csv file with some text and numeric data. I've used BufferedReader to successfully print the data to the console. Now I need to perform mathematical operations on the numerical data. How do I access the data from the BufferedReader in my calculation methods?
What I would like to be able to do is create some loops to calculate totals for some of the elements, but I'm not sure how to access the data from other methods (and potentially classes?).
I have to make an application called miles to meters that converts miles to meters that asks for user input through joption pane and the output can be eather system.out.println or joption pane, I found the code i need but it uses buffered reader for input not joption pane. Here is the source code
import java.io.*; import java.util.*; class MetersToMiles{ public static void main (String[] args)throws Exception{ // 1 meters = 0.00062137119 miles;
I am reading each line of the input one line at a time and incrementally storing four char positions into an array, so i am able to hold a vertical representation of each column. I.e. column 1 will be stored in array[0].
The problem with my code is that is does not read the last line of the input, it reads all the other inputs before it but just refuses to read the last line and execute the procedure of storing the characters.
Code:
public void defuseBomb(){ try { BufferedReader reader = new BufferedReader(new InputStreamReader( System.in)); String asciiLine = reader.readLine()+ " "; int digit = (asciiLine.length())/4;
I have a text and I am reading each line in the text with the simple while loop:
BufferedReader br = new BufferedReader(new FileReader(new File(a.txt))); string line = new String(); while((line = br.readLine())!=null){ if(line.equals("john")) //skip to next line else{ //continue something else.. } }
My question is how do I skip to the next line ? Using apache.commons.io.FileUtils; one could easily have done something like this:
LineIterator it = FileUtils.lineIterator(file, "UTF-8"); String line = it.nextLine(); //this goes to the next line..
public static String readBuffer(Reader reader, int limit) throws IOException { StringBuilder sb = new StringBuilder(); for (int i = 0; i < limit; i++) { int c = reader.read(); if (c == -1) { return ((sb.length() > 0) ? sb.toString() : null);
[Code] ....
I am particularly confused with the below lines -
if (((char) c == ' ') || ((char) c == ' ')) { break; }
This is how I am calling this code from my application -
I'm making a tree of contacts with people's names as one string and their numbers as another. I need to read that in from a .dat that is set up to have two columns, across from the names are the numbers, so i have to read that in, but I'm not sure how. Here is what I have:
Tree<String, String> tree = new Tree<String, String>(); BufferedReader br = new BufferedReader(new FileReader("/Users/katedess/Desktop/animals.dat")); String read; while((read = br.readLine()) != null) { tree.add(read); } br.close(); }
I have strings in forms like s="(S (NP (DT This)) (VP (VBZ is) (NP (DT an) (JJ easy) (NN sentence))))"Programatically, I need to have words which end with ')' to be in an extra pair of brackets.. such that s = "(S (NP (DT (This))) (VP (VBZ (is)) (NP (DT (an)) (JJ (easy)) (NN (sentence)))))
Note that , words like "this" and "is" are now enclosed in brackets.I tried to create a program which would search for an alphabet followed by ')' and would put it in bracket... but then arrays can't have insertions in between.
The # are delimiters between data items and each line has the call status as the last item. I need to know how I can display each persons information on the screen in a format such as:
Name Phone Calls Out Calls In Last Call
Marilyn Adams (823) 333-1109 0 0 01-01-2104 John Anderson (502) 555-9980 20 15 12-15-2013 Angelica Baker-Brown (859) 254-1109 11 5 02-11-2014
I have to use substring method to extract the phone number and add parentheses/dashes ect I also must have a while statement and a delimiter...
So Far my code looks like this Also I am in a beginners Java coding class....
import java.util.Scanner; import java.io.*; public class phonedata2_1 { public static void main (String[] args) throws IOException { String Phonefile, FirstName, LastName; Scanner PhoneScan, fileScan;
I have to write a program that asks the user to enter the name of their favorite city and use string variable to store the input. The program should display the following:
-The number of characters in the city name -The name of the city in all uppercase letters -The name of the city in all lowercase letters -The first character in the name of the city
However, I can't seem to get past the following errors;
Programming Challenge #12.java:37: error: variable cityFirstChar is already defined in method main(String[]) char cityFirstChar = city.charAt(0); ^ 8 errors[CODE ----jGRASP wedge2: exit code for process is 1. ----jGRASP: operation complete. [/CODE]
My code is as follows:
import java.util.Scanner;
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */
I've been working my way through a tutorial to build a simple 2D tile-based engine that also allows the code to manipulate the colour of pixels on the screen based on a monochrome map read from a file. I've got the code right line for line, but I seem to have a bug when it comes to draw to the screen! At regular intervals, despite what is held in the pixel array of ints (which I have confirmed to be correct when debugging), I get the same row of pixels being draw twice in a row. I figured there was some loop issue somewhere, but after attempting to debug this for some time, I haven't come up with the answer.
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.
ive been working on a poker game in java but seem to have got stuck in my 3 of a kind. What I was trying to do was create a loop that would increment a counter every time time is more than 1 instance of a card, but even if the counter increments and I draw a 3 of a kind it still returns false.
private boolean ThreeOfKind(ArrayList<Card> sortedCards) { Card previousCard = null; for (Card c : sortedCards){ int kindcount = 0;
I am new to javafx I start using it instead of swing i used the scene builder for my forms the problem i faced i don't know how to have main screen with menu bar at top and depending the select from the menu it will open other windows and those window must be inside my window just like for example netbeans.
I don't need to open new window in separate i need all windows inside my main window and controlling over them minimize maximize perhaps.
How would I go about erasing the first buffered image before displaying the second one and eventually a third and fourth so that it appears the image is moving across the screen?
I am trying to read an image I have in the location of my project, So I do this:
When I read it in the try/catch like: BufferedImage image = ImageIO.read(new file(""));
And try to access it after the try/catch, it does not know that image exists, so I need to declare it as a global variable for that class first, and then it works.
public class Gui extends JFrame { private BufferedImage image1; public Gui() { super("MyApp"); setDefaultCloseOperation(EXIT_ON_CLOSE); setLocationRelativeTo(null); setVisible(true); initUI();
I wanted to write a method which gets a buffered image as parameter, rotates it 90 degrees clockwise around its top left corner, and then returns it. This method will be call from another method which then draws the rotated image on a rather large background which consists of many other images.
Here is the code I have so far:
public static BufferedImage rotate(BufferedImage img) { int w = img.getWidth(); int h = img.getHeight(); BufferedImage newImage = new BufferedImage(width, height, img.getType()); Graphics2D g2 = newImage.createGraphics(); g2.rotate(Math.toRadians(90), w/2, h/2); g2.drawImage(img,null,0,0); return newImage; }
This method does rotate an image 90 degrees, but when the calling method recieves this image and displays it on the bigger frame, parts of the rotated image is cut. I think because the frame holding the returned image is not big enough. I've tried playing around with the code a lot, chaging the sizes of different images, and trying AffineTransform features, but I have had no luck.
I am writing a java program that takes a FROM image, a TO image, and a ratio (this is a slide bar in the GUI). Here's my code: Java Code:
public static BufferedImage rollUp (BufferedImage from, BufferedImage to, double ratio) { BufferedImage finalBufferedImage = new BufferedImage(from.getWidth(), from.getHeight(), from.getType()); int packedColor = 0; for (int r = 0; r < from.getHeight(); ++r) { for (int c = 0; c < from.getWidth() ; ++c) {
[code]...
So from 0 to 1 (ratio is a double between 0 and 1) the image will "roll up". The effect works completely in the GUI, but the console freaks out at about 0.33 ratio.. This program runs for testing in a class Main and uses a class Splittinimage.. this method is in class TwixPix. When the main class is run, a box pops up with a combo box and a slider. You pick an effect (in this case, roll up) and then slide the slider to set the ratio. The image below those two things performs the effect that was selected. Imagine a PowerPoint presentation slide effect.
private void createTextBox() { Graphics g = Game.getG(); Font font = new Font(fontName, fontStyle, fontSize); g.setFont(font); height = BORDER_WIDTH*2 + g.getFontMetrics().getHeight(); int stringWidth = g.getFontMetrics().stringWidth(dialog); width = BORDER_WIDTH*2 + stringWidth;
[Code] .....
This gets called when ever I want to create my Textbox object however what gets created is a purple box (i know that I have set the array elements to purple to begin with) however when I try to use the drawstring method to "draw a string" I get an image which looks like the gif below. I have changed the text size to various sizes but without success. The string is supposed to say "This is a test" but obviously it doesn't.
How can I write a BufferredImage to an 8-bit .bmp using indexed colors stored in a <String,Color> Hashtable?
I've never used Hashtables before, and I didn't know color indexing existed until now, but I can do most other things in java fairly well.
I'm not looking for code, just the concept, as I really don't know how Hashtables work (although I could figure it out), and how color indexing does. I know how to write image files, just not indexed or with a specific number of bits. I am using Hashtables generated from GIMP.
EDIT: I mainly want to know how to save a BufferedImage as an indexed .bmp.
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.
How do I make the file reader object move to the next line if there is no more input on the line. Here is my text and output file as you can see that my text file column cuts off on the 2nd line after 70. I want to read that next line which is 100 into my labs variable however its reading it into my final exams variable. I'll also post the code but I didn't think it was necessary.
textfile: 100908095 1008070 10070
output: Labs Projects Tests Final Exams 100908095 1008070100 70
[import java.util.Scanner; import java.io.*; public class MyGrades { public static void main (String[] args) throws IOException { int lab, project, test; int finalExam;//Par and Player values
So what I do normally is draw the bottom layer of grass, and when I draw the second layer with trees, the tree layer has a shadow, that shadow doesn't go ontop of the grass layer, but instead it overwrites the grass layer aswell and I've checked the color codes, the shadow has combined with white, not the first layer.
it's obvious that that's not how alpha works then, how do I do it?
