Physics Calculator - Manipulate Equations To Find Unknown Variable
May 4, 2014
There are a lot of variables in physics and it is easy to manipulate equations to find the unknown variable. Well, in my program I have the problem of determining which equation to solve for an unknown. You can see I have a timeF, timeI, time, distanceI, distanceF, distance...etc...variables. The way that I have written the code, it will scan for an empty() JTF and assign it as the unknown variable (not sure I can do it this way anymore). At that point, the value is passed into the correct calculation method to process the equation based on a series of case statements in each method...
I know the button arrays I have set up will process correctly in the checkJTF method...and I will need to account for that...but right now my focus is on getting the program to properly calculate the kinematics equations and display the result in the JPanel.
public class PhysicsFrame extends JFrame {
//Kinematic variables
private static float distanceI, distanceF, velocityI, velocityF,
velocityAverage, acceleration, time, timeF, timeI, result;
//Power variables
[Code] .....
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Jun 1, 2014
I am trying to understand what ivor is saying about the and, and or operators and the mask. If I understand it correctly the & operator prevents you from changing a bit that is one when a mask is involved and changes all others to 0 and the | operator forces a bit to 1 when the mask is 1.
My question is when would i need to actually use the & ,| operators ?when will i need to manipulate the bits in a variable?
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Jul 31, 2014
I am trying to use a JFrame to open up extra windows that will prompt the user the Log In or Out, but I am getting an error with one of my variables that writes to Excel. There is something wrong with the variable "sheet" contained in the "while(i <= 4)"
private void createLabel(WritableSheet sheet) throws WriteException
{
WritableFont times10pt = new WritableFont(WritableFont.TIMES, 10);
times = new WritableCellFormat(times10pt);
times.setWrap(true);
WritableFont times10ptBoldUnderline = new WritableFont(WritableFont.TIMES, 10, WritableFont.BOLD, false, UnderlineStyle.SINGLE);
[Code] .....
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Aug 18, 2014
At first I wanted to just use an array and set each day a value, however I was told that it has to be stored as a string.
Design and implement the class Day that implements the day of the week in a program. The class Day should store the day, such as Sun for Sunday. The program should be able to perform the following operations on an object of type Day:
A. Set the day.
B. Print the day.
C. Return the day.
D. Return the next day.
E. Return the previous day.
F. Calculate and return the day by adding certain days to the current day. For example, if the current day is Monday and we add four days, the day to be returned is Friday. Similarly, if today is Tuesday and we add 13 days, the day to be returned is Monday.
G. Add the appropriate constructors.
H. Write the definitions of the methods to implement the operations for the class Day, as defined in A through G.
I. Write a program to test various operations on the class Day.
import java.util.*;
public class Day {
static Scanner readinput = new Scanner(System.in);
String day;
public Day(String day) {
[Code] ....
So right now if I run my code it allows me to type in a day, then it gives me the next and previous day, the last part is to add X days to it. Ideally I would like to be able to take the day entered, depending on the day set a numeric value, then add prompt for number of days you want to add. The program should then use modal (%7 ) to add value to the value that was given based on the day, and then translate it back into a String value (the day).
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Jun 16, 2014
I've been stuck on this one for a while. If you scroll down to the while loop there is some code that calculates the angle of a triangle created by two circles colliding. The problem is, The angle between the hypotenuse / x axis, and the angel between the hypotenuse / y axis never go above 65 degrees and i have no clue why?
import java.awt.Color;
import java.awt.Graphics;
import java.util.Random;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class MainTest extends JFrame {
public rectt g = new rectt();
[Code] .....
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Dec 11, 2014
The problem I'm having right now is invoking the get method in my main. I get a "cannot find symbol - variable deposit" error message. I also am at a loss as to what to do for the first two classes as well as the interest class. What I had for the first two didn't work, so I scrapped itand don't remember what it was.
Here's the code and error message:
import java.text.NumberFormat;
import java.util.Scanner;
public class BankAccount
{
private double balance;
private double name;
private int BankAccount;
[Code] .....
Attached image(s)
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Sep 14, 2014
I am trying to create this program I am pretty sure it is easy but I am making it difficult lol, it keeps giving me a error, it is saying cannot find symbol - variable keyboard, I don't think I have keyboard as a variable but I may be wrong.
double distancel = keyboard.nextdouble(); that is the specific line ....
import javax.swing.JOptionPane;
import java.io.File;
import java.util.Scanner;
//import java.util.totalInches;
//instance variables
public class Map{
public static void main(String[] args){
[Code] ....
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Nov 29, 2014
I am new to java coding. so reading the log file using java code.
1) I wish to parse a file, and find a value for variable e.g. [StorageVersion].
2) After finding the value, it will be pushed to database.
Log File Path e.g. C:Temp est.txt"
Sample Logs :
{
//NAME
[1.2.2917] := s['3.4.454545'];
//Parameter
[1.2.2947] := s['1.2.56778'];
//Enabled
[1.2.3910] := B['22.43434.12232'];
//MAXCLOUMNNAME
[1.2.4217] := N['1.7.899982'];
//StorageVersion
[1.2.2917] := K['706146.0.22106932'];
}
From above log file, the Value i need is "706146.0.22106932"
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Jun 5, 2012
Im running into some problems with the Java compiler. This is my code:
public class DoublyLinkedList<T> implements SimpleList<T> {
protected Node dummy;
protected int n;
public DoublyLinkedList(){
dummy = new Node();
dummy.next = dummy;
dummy.pre = dummy;
n = 0;
[Code] ....
I want to use a dummy node in my implementation of the Doubly Linked List, so it will be easier to code all the methods I need to write. I keep on getting a problem with line 14 and 15:
dummy.next = dummy;
dummy.pre = dummy;
// cannot find symbol variable next (compiler error)
// cannot find symbol variable pre
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Mar 15, 2015
Design a class named LinearEquation for a 2 X 2 system of linear equations:
ax + by = e
cx + dy = f
Where
x =
ed − bf/ad − bc
y =
af − ec/ad − bc
The class contains:
- Private data fields a, b, c, d, e, and f.
- A constructor with the arguments for a, b, c, d, e, and f.
- Six get methods for a, b, c, d, e, and f.
- A method named isSolvable() that returns true if ad−bc is not 0.
- Methods getX() and getY() that return the solution for the equation.
[code].....
how to display the information I need to display. Also I am not so sure that I wrote the code properly, I do not get any errors when I compile it.
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Oct 10, 2014
I am in search of a library that has been created in JAVA that can be utilized to solve for roots of a nonlinear system of equations. Each equation has 2 variables, x and y, and will need a library that uses higher calculus equations. No ones that just solve for x.
Most of the libraries that have been created to solve nonlinear equations are either in Fortran, C, or Python. There are a few libraries such minpack/scipy. The only libraries that I have been able to find or programming solutions that are in JAVA either require additional programs such as Matlab or are commercial products
I did find one library put together by a professor in Colorado State, but am unsure how to use it. There does not seem to be a way to enter your functions in the code.
Newton Raphson Method - Multivariable(x and y)
[URL] .....
How to use this library or find a library that can be used in an android application would be amazing.
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Feb 14, 2014
I am suppose to write a method for solving a quadratic equation using the following header:
public static int solveQuadratic(double[] eqn, double[] roots)
I have entered 1, -3 and -4. The answer I get is "The solution is:0.0" .
import java.util.Scanner;
public class QuadratilEq {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner (System.in);
double[] eqn = new double[3];
double[] roots = new double[4];
[Code] .....
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Sep 22, 2013
So i was assigned to write a program that would print the answer to the system of two linear equation. the form of ax+by=c and dx+ey=f..I wrote this program, but it is incorrect since I tried it out on my terminal and I keep getting incorrect values.
import java.util.Scanner;
public class Quest4 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
[code]....
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Oct 10, 2014
I am in search of a library that has been created in JAVA that can be utilized to solve for roots of a nonlinear system of equations. Each equation has 2 variables, x and y, and will need a library that uses higher calculus equations. No ones that just solve for x.
Most of the libraries that have been created to solve nonlinear equations are either in Fortran, C, or Python. There are a few libraries such minpack/scipy. The only libraries that I have been able to find or programming solutions that are in JAVA either require additional programs such as Matlab or are commercial products
I did find one library, but am unsure how to use it. There does not seem to be a way to enter your functions in the code.
Newton Raphson Method - Multivariable(x and y)
www(.)math.colostate(.edu)/~benoi...s/solvers.html
How to use this library or find a library that can be used in an android application.
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Nov 7, 2014
I have a .txt file which i am currently using Scanner to input into the console, the text file contains the names of football games followed by their scores:
E.g. Man U : Liverpool : 2 : 1
I need to create an equation to add together all scores to create a string reading something like "total goals: 28" ....
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Feb 23, 2015
So I need to create a square and make it rotate when the letter R is pressed and then make it stop when the letter R is pressed again. I need make it rotate using a maths equation that I can't figure it out myself right this moment.
Code for square:
package lab2;
public class Square {
public double [][] vertices = new double[4][2]; //not good to make this public
public Square(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4) {
vertices[0][0]=x1;
vertices[0][1]=y1;
vertices[1][0]=x2;
[Code] ....
In the Square code there is a method to write an equation to rotate it but I can't figure that part out ....
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Oct 7, 2014
int x = 10;
do{
System.out.print("value of x : " + x );
x++;
System.out.print("");
}while( x + x == 22 );
When i put x+x==22 than it gives 2 values of x which are 10 and 11, they are wrong but when i put any other value like x+x==24 it just shows 1 value which is 10. I am not able to understand what mistake is there. I have been searching it for past whole month but didn't got any reason.
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Apr 9, 2015
I am having errors but not sure why.
My two classes. I have pointed out the lines that are causing the errors. -
import gfx.SpriteSheet;
import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;
[Code] .....
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Oct 11, 2014
I am in search of a library that has been created in JAVA that can be utilized to solve for roots of a nonlinear system of equations. Each equation has 2 variables, x and y, and will need a library that uses higher calculus equations. No ones that just solve for x.
Most of the libraries that have been created to solve nonlinear equations are either in Fortran, C, or Python. There are a few libraries such minpack/scipy. The only libraries that I have been able to find or programming solutions that are in JAVA either require additional programs such as Matlab or are commercial products
I did find one library put together by a professor in Colorado State, but am unsure how to use it. There does not seem to be a way to enter your functions in the code.
Newton Raphson Method - Multivariable(x and y) Page Not Found
How to use this library or find a library that can be used in an android application would be amazing.
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Nov 24, 2014
My program compiles and runs ok how ever when i open my Jinternal frame and click on one of the JLabels i get a error on the Cmd ther error reads as follows
************************ ERROR **************************
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at JLabelAssignment.mouseClicked(JLabelAssignment.jav a:429)
at java.awt.Component.processMouseEvent(Component.jav a:6508)
at javax.swing.JComponent.processMouseEvent(JComponen t.java:3320)
[code]...
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Feb 20, 2014
So I want to know how in Java you can pass a unkown type into a method (type can be an int, double, or a user defined object) and return that unkown type.
example of what I want:
Java Code:
public (unknowntype)[] method2 ((unknowntype)[])
//Process Data
//unknowntype.process();
return (unknowntype);
} mh_sh_highlight_all('java');
I know in C you can use void pointers and in c++ we have templates but I do not know how java handles this. Also I want to know if it is possible to call a method in the unknowntype.
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Feb 17, 2015
I'm a independent IT contractor. On 2 systems this week I've experienced an issue when attempting to download JAVA the file is of an unknown type in IE. See attached. Alternative browsers on the same machine function properly.
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Sep 24, 2014
I build a select tag string and use JSTL to display this string on the JSP page.
Is there an easy way to manipulate this string to remove one of the option pairs?
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Jul 15, 2014
I was recently looking at the Tesseract module to convert handwritten text into typed text, however I was wondering is there anything out there, or any code which would allow me to do it the other way? I would like to load up a piece of typed up text (pdf, word, even notepad), and be able to turn it into an object for manipulation.
In the long run, I'd like to be able to open up a pdf document, click on some text, edit it, then use tesseract to turn it back into typed text.
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Apr 23, 2014
I am new to threads, This is a project about 2048 game to be more accurate, and i want this project to run in this thread that i make in main...
My main:
public class Execute {
public static void main(String[] args){
Display d = new Display();
Shell s = new Shell(d);
Model m = new Game2048Model();
View ui = new Game2048View(m.getBoardArr(),d,s);
[Code] ....
And the error is:
Exception in thread "Thread-0" org.eclipse.swt.SWTException: Invalid thread access
at org.eclipse.swt.SWT.error(Unknown Source)
at org.eclipse.swt.SWT.error(Unknown Source)
at org.eclipse.swt.SWT.error(Unknown Source)
at org.eclipse.swt.widgets.Display.error(Unknown Source)
at org.eclipse.swt.widgets.Display.checkDevice(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at view.Game2048View.run(Game2048View.java:55) //problem at Run
at java.lang.Thread.run(Unknown Source)
Here is the problem....
@Override
public void run() {
while(!shell.isDisposed()){
if(!display.readAndDispatch()){
display.sleep();
}
}
display.dispose();
}
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Sep 2, 2014
I got stuck with the error "Unknown class" with the code that I copied from the book ...
import javax.swing.*;
class SwingDemo
{
// create a new JFrame container
JFrame MAIN_FRAME = new JFrame ("A Simple Swing Application");
// give the frame an initial size
MAIN_FRAME.setSize(275, 100);
// terminate the program when the user closes the application
MAIN_FRAME.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
[code]...
The error comes from lines 21 and 27.
21 MAIN_FRAME.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
27 MAIN_FRAME.add(FIELD_LABEL);
I have tried to rewrite from scratch and still gets the same error.
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