Remove Question Marks And Exclamation Points
Jan 24, 2015
I wrote code to remove question marks and exclamation points from some text. However, one can find those in my output file. Interesting enough, the periods (full stops) were removed.
import java.util.Scanner;
public class TextTokenizer {
private Scanner scanner;
private String[] removableCharacters = { ".", "?", "!", ":", ";", """, "'" };
public TextTokenizer(char[] texts) {
scanner = new Scanner(new String(texts));
[Code] ....
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Nov 6, 2013
This is what he wants: He wants us to prompt the user to input x values and y values (that will be entered into an array when clicking one of the two buttons (this one will say: Add point)). When they click the second button (draw lines), it should take all the points and draw a line that connects all the points together using a method that we write. In the method we have to call the paint method up which the lines will be drawn. The lines drawn should be touching every point added. It shouldn't have parameters. It will also use Graphics painter = getGraphics(); We can't use frames either.
I have everything up until the method understood.
How to write a method that will draw a line from points inputted that is called up in the action listener when the second button (draw lines) is pressed.
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Jan 27, 2014
I have this piece of code, which adds marks into 2 different arrayLists, one for homework marks, and one for examination marks..
ArrayList<Double> homeworkMark = new ArrayList<Double>();
ArrayList<Double> examinationMark = new ArrayList<Double>();
boolean markCheck = true;
do{
//
the purpose of this try catch is to make sure that the entered mark is a valid number. If the program encounters an exception markCheck will become true and the loop will begin again asking the user to enter the marks. If the marks are all encountered correctly markCheck will be false and the loop will end.
try{
for (int i = 1; i <= amountAssignment; i++ ) {
sc.reset();
System.out.print("Homework Mark for Assignment " +(i) + ": ");
homeworkMark.add(sc.nextDouble());
System.out.print("Examination Mark for Assignment " + (i) + ": ");
examinationMark.add(sc.nextDouble());
markCheck = false;
[code]....
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Feb 6, 2015
I am testing a code given by my lecturer and the output it gives me are all question marks? Heres the code:
package assignment;
import java.util.Random;
public class DeckOfCards { // begin DeckOfCards data type
// playing cards of deck of cards
private PlayingCard[] deck;
[code]....
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May 7, 2013
I'm new to Java, & am using Eclipse Helios. How do I change the text colour within the Quotation marks "Try Again" to red, or any other colour, so when I run it, it will display the new colour.
println("Try Again!!");
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Nov 13, 2014
I'm trying to make a program that will count each letter like if I put the word
e-1
h-1
l-2
o-1
The problem I'm running into is that if I put something like How now, brown cow? It should give me something like this
b - 1
c - 1
h - 1
n - 2
o - 4
r - 1
w - 4
but it doesn't instead the whole program crashes because of the punctuation marks and the spacing. Is there a way for me to fix that? All I know is that it has something to do with the alphabet[pos(letter)]++;
import java.util.Scanner;
public class CharCount {
static Scanner keyboard = new Scanner(System.in);
//this method should allow the user to enter a line of text (that should all be lower case) and then go to the printResults method
public static void main(String[] args) {
String text, character;
int count;
char letter;
int[] alphabet;
System.out.println("Enter a line of text:");
text = keyboard.nextLine().toLowerCase();// any text entered will be lower case
alphabet=countLetters(text);
[code]....
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Jan 10, 2014
Here is the code
public static void main(String[] args) {
Scanner Keyboard = new Scanner(System.in);
System.out.print("Please enter your name.");
String name = Keyboard.next();
name = "name";
[Code] ....
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Jul 4, 2014
I am planning a race simulator car and I have a problem to get the x and y coordinates from the graph (or circuit). I explain the problem better. If I for example, drawing an arc using the library DRAW2D how do I get all the points in x and y coordinates of that arc?
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Dec 3, 2014
In one part of my small code, I want to make a sky which will have area of 200 * 200 pixels, and inside I want to have 100 randomly placed stars (I tried to make an array of 100 elements - of class "Point").Each star should have its x and y coordinate, and I don't know how to do it. I tried many things.
import java.util.Random;
import java.awt.Point;
public class Sky {
private Point[] stars = new Point[100];
public Sky() {
for(int i = 0; i< stars.length; i++){
Random r = new Random();
int u = r.nextInt(199);
int v = r.nextInt(199);
//x[0].setLocation(u,v);
21stars[0].x = 5;
[code]...
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Mar 14, 2009
hey just having some trouble with a homework question:
For this question you will use the Point class from the Java API, which represents points in 2-dimensional space, each of which has an x and y coordinate. You must write a program called Distance, which does the following:
1. Reads in the coordinates (separated by spaces) of two points
2. Creates two Point objects with the values entered by the user
3. Uses the distance method of the Point class to calculate the distance between the two points
4. Prints out the distance
Details on how to create Point classes can be found in the Java API documentation. However, for this question the only two methods you need to know about it are the following:
- Point(int x, int y) - Constructor; creates a new point
- double distance(Point other) - Calculates the distance between this point and another point
I think what i have so far will work, im jsut having problems creating 2 new objects . it points at new and says incompatible types. And also points at +distance and says cannot be de reference from a static context.
import java.awt.Point;
import java.util.Scanner;
public class Distance{
private int pointX;
private int pointY;
private double distance;
public Distance(int x,int y)
[Code] .....
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Oct 10, 2014
I need to write a program but I am having hard time filling an array of triangles...we are suppose to have 3 different classes..1 class of points..1 class of triangles and 1 main method which apply all those..here what I have been come up so far for the point class which I believe is good..
public class Point {
private float x;
private float y;
//Making x equal to the x coordinate and y equal to the y coordinate like on a graph
public Point(float xCoordinate, float yCoordinate) {
x = xCoordinate;
y = yCoordinate;
[Code] ....
Now here is my question how I am suppose in the main method fill an array of triangles for 100 triangles or less?
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Jan 20, 2014
Here is my code
Java Code: //Points Display
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.Dimension;
import java.util.Random;
[code]...
1. Why, when I press "New" rapidly, will it skip painting shapes sometimes/adding to totcount.
2. How can I make it so that The box in the background(which is currently connected in the wrong way as I was getting an error when I connected it correctly) can be modifiably large. AKA, I want to draw a grid in the background that can be different sizes, depending on the values of a variable xsize and ysize.
3. What can I do to clean this up? All I want it to do is display the convex hull of the four points given in the int[][] displaypoints.
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Oct 24, 2014
I am trying to receive an input file which has either 6 or 8 points and whether it is 6 or 8 points, I do ask the program to save it into an array and then print it. However my program crash after printing few lines. I do know what is wrong with the program my line.split(",").length print 1 at the first and then start printing the numebrs in teh rest of lines which makes it skip a line which means the lines that has for example 8 points will go to a loop that only 6 points and a line that has 6 points will go to a loop that has 8 points and then obviously crashes.
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Scanner;
[code]....
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Aug 19, 2014
I want to know that how can i use break points in net beans 8. I'm able to put break point by clicking at the line but don't know how to use it..Actually i'm getting wrong output of my code and i want to know my line by line execution of the code so i can get better idea of where is my code going from one line to other. I have used break point in micro soft visual studio2010 and that was easy after puting break point run the project then f11 to get line by line execution...I want to know any method exist in java net beans (i'm doing GUI swing controls)...
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Oct 24, 2014
I have to print points on a circle in increments of -0.1, but when I use a number larger than 1.3, the list stops at 0.1 larger than negRadius, and I don't know why. (Assume the center is (0,0))
public class PointsOnACircleV1
{
public static void main(String[] args)
{
double radius = 1;
[code]...
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Dec 11, 2013
I need to know the sinus or angle between two points (x1,y1) and (x2,y2).
Any formula to calculate this?
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Jul 23, 2014
I extracted columns from database and made calculations inside while loop. I know i need to make array to get from it coordinates for points. I want to draw them in interface created in another class but i have black hole and don't know how to get datas from while loop to array which is below.
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Oct 24, 2014
I am trying to add Point objects into an Array.This is my code to read in data
Java Code:
public void readRoadMap(File road) {
try{
String line;
BufferedReader br = new BufferedReader(new FileReader(road));
while((line = br.readLine()) !=null){
this.points.add(new Point(line));
[code]....
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Jan 18, 2015
I am having trouble figuring out where to put %.2f in my code. I need it to get my answers for surfaceArea and Volume to be rounded to two decimal points. I have everything completed but wherever i put it, it seems to not work.
System.out.println("This program will compute the volume and surface area of a rectangular prism.");
String output;
double length;
double width;
double height;
double volume = 0;
double surfaceArea = 0;
System.out.printf("%.2f", surfaceArea);
[code]....
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May 5, 2014
I have a link with URL say "/atom/filename.link" on one webpage on my server. On clicking it, a response will return in XML format.
In the XML there is information like:
<library id = "123" path =""/>
<document id = "1234" path =""/>
With this information I can generate a URL to another link, say /libray?id=123/document?id=1234
Now I would like to realize a function so that on clicking this link, it will be automatically redirected to that new link, which is generated from the XML file.
At first I try to use a servlet/filter in a web-app and then deploy it on the server, inside this servlet/filter I make a new URL connection with the same request URL and retrieve the response and the parse the XML data. But now the request URL points to the servlet now, not the actual XML file.
For example, if I set the set the servlet-mapping to /atom, If I try to connect to the URL /atom/filename.link inside the servlet, will it still be directed to this servlet? It's like a loop, and the real content can never be reached because now the servlet occupies its path.
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Feb 24, 2014
Operator is undefined for argument type. Error is located at the end of the binary search method array[position] < key
import java.util.Arrays;
public class binarySearch {
public static <T extends Comparable<T>> int binarysearch(T key, T[] array) {
int start = 0;
int end = array.length - 1;
int position =-1;
while (start <= end && position == -1) {
[Code]....
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Feb 17, 2015
I have the following HashMap:
// 2009
nobelPrizeWinners.put("2009 Physics",
new PrizeWinner[] {new PrizeWinner("Charles K.", "Kao"),
new PrizeWinner("Willard S.", "Boyle"), new PrizeWinner("George S.", "Smith")});
nobelPrizeWinners.put("2009 Chemistry",
new PrizeWinner[] {new PrizeWinner("Venkatraman", "Ramakrishnan"),
[Code] .....
At the moment, my output is:
2008: Chemistry: Osamu Shimomura, Martin Chalfie, Roger Y. Tsien
2008: Economics: Paul Krugman
2008: Literature: Jean-Marie Gustave Le Clézio
2008: Medicine: Harald zur Hausen, Françoise Barré-Sinoussi, Luc Montagnier
2008: Peace: Martti Ahtisaari
[Code] .....
However, I need a blank line between the final entry of 2008 and the first entry of 2009.
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Dec 12, 2014
This is what I wrote and I get this eror : Points to Ponder for Java Null Pointer Exceptions
public class Line{
private Punkt2d pStart;
private Punkt2d pEnde;
public Line(Punkt2d pStart, Punkt2d pEnde) {
this.pStart = pStart;
this.pEnde= pEnde;
[Code] ....
Erorr:
Exception in thread "main" java.lang.NullPointerException
at Line.getLength(Line.java:38)
at Aufgabe_6_1.main(Aufgabe_6_1.java:7)
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May 1, 2015
Write a program that draws 20 circles, with the radius and location of each circle determined at random...... Two circles overlap if the distance between their center points is less than the sum of their radii...
There may be many problems with the code in general but what I'm struggling with is the distance and the totalradius portion. Visually, its inaccurate.
import java.awt.*;
import javax.swing.*;
public class CircleTest extends JPanel {
Circle []circles;
Circle []circleCenter;
Circle []all;
private int distance, totalradius, dx, dy;
private int radius,x,y;
[Code] ....
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Sep 17, 2014
I'm trying to stress test JavaFX and I'm on Window 8.1 using 1.8.0_20-b26. I have an application that has many objects on the scene with animation timers and overall it purposefully runs very slow. I have listeners on the root AnchorPane for touch input and if I generate many touch point events after a few minutes I get "Too many touch points reported" exceptions (posted below) and the app of course no longer responds to touch input. Is it possible to catch the exception and then reset the scene touch input so it goes back to normal without restarting the application? If it lost any current touch input that's fine.
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: Too many touch points reported
at javafx.scene.Scene$ScenePeerListener.touchEventNext(Scene.java:2686)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleNextTouchEvent$346(GlassViewEventHandler.java:1090)
[Code]....
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Mar 24, 2014
What would be a good and simple algorithm to find the shortest route between two points in a 2D array[grid] ? There can be certain obstacles in the grid i.e. some of the cells may be inaccessible. I tried googling for it and found that A* is the best for this but I am just a beginner and would like to start with something much simpler.
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