How To Fill Array Of Points

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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Applets :: JApplet That Ask User For Points And Draw A Line From Said Points

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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Array Of Points

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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Nov 2, 2014

THE PROGRAM DOES NOT HAVE ERRORS. FILL THE 2D ARRAY WITHOUT DUPLICATES VALUES. AND DISPLAY IF THE ARRAY IS MAGIC SQUARE OR NOT.

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Dec 8, 2014

my validAccounts array will not fill properly and has a null value in it.I added a print statement that prints the contents of the array and it is filling correctly but the very last value is null. I am supposed to be asking the user for a account number and password and it is not printing out correctly due to the fact that the array is not filled correctly.

import java.util.*;
import java.io.*;
public class ATM2 {
public static Scanner kbd;
public static final int MAXSIZE = 50002;

[code]....

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Dec 7, 2014

I must fill a 2d array randomly and then apply methods to the array. However i keep getting an out of bounds exception no matter what dimensions i use. I have a test and a class program.

import java.util.*;
import java.lang.Math;
import java.util.Arrays;
import java.util.Random;
class SummerStats {
Random rand = new Random();

[Code] .....

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ValidAccounts - Array Will Not Fill Properly

Dec 8, 2014

My validAccounts array has a null value in it when i print it. How to do this.

I am NOT allowed to use bufferedReader or ArrayLists. This must be done with loops.

import java.util.*;
import java.io.*;
public class ATM2 {
public static Scanner kbd;
public static final int MAXSIZE = 50002;
public static void main(String[] args) {
kbd = new Scanner(System.in);

[Code] ....

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Adding Points Objects Into Array

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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Dec 16, 2014

I am attempting to make a 5x5 bingo board. My array generates 75 numbers(15 per bingo letter) and displays them in a random order. What I am having trouble figuring out is how to fill the 5x5 grid with 25 numbers from my array. And yes, my code is probably much longer and much more redundant than it needs to be. Also, I think I'm using cells and grids terribly wrong (possibly the entire java language) but I'm not sure.

import java.util.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.event.*;
import java.util.ArrayList;
import java.awt.GridLayout;
import javax.swing.JButton;
public class bingoboard extends JFrame

[code]...

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Insertion Points In Array Using Binary Search Using Comparable

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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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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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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Distance Between 2 Points

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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Jun 13, 2014

We get a database and some DAO classes. We had to fill a ShowPanel with different shows being given in a theatre, and then when you choose from this you get several dates. Then when you click a date, the seatings appear in the SeatPanel. I got the first part with the shows and dates. But Im stuck at getting the seatings.We have a controller class which calls the shows+dates (this happens in one method). But i always get a nullpointerexception for the seatings. (this happens in a different method). I think i just don't know how to link the chosen show+date with the seatings.For the moment i have

public ArrayList<Seats> getSeating() throws SeatingException{
Show s = shows.getName();
ArrayList<Showdate> showdate = s.getDates();
ArrayList<Place> seating = new ArrayList<Place>();
try{
for (Showdate sd : showdate ){

[code]...

The given class PlaceDao has a static getInstance() method and an ArrayList<model.Place> getSeating(model.Showdate showdate) method.In the next stage i have to try and fill the panel with the seatings, but first i need to be able to call them.

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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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public class PointsOnACircleV1
{
public static void main(String[] args)
{
double radius = 1;

[code]...

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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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import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
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[code]....

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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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