File Paths In Eclipse / Jgrasp
May 1, 2014
So I downloaded jgrasp and eclipse on a new computer and am trying to figure out how their filing/path system works.In eclipse I created a new project under which I've imported all my files for my comp sci class, so they're all under this one project which is my only project. I attached a pic of what my eclipse workspace looks like. In this project folder is a file I'm trying to run.
I keep getting an error saying "editor" does not contain a main type.When I change my class name to the project folder I end up getting an option to run the program as an applet or an application, but either one I choose I get the same error message. In the bottom it gives me a warning saying
DescriptionResourcePathLocationType
Build path specifies execution environment CDC-1.1/Foundation-1.1. There are no JREs installed in the workspace that are strictly compatible with this environment. CS1050AssignmentsBuild pathJRE System Library Problem
I tried running the program in jgrasp and got this error
----jGRASP wedge2 error: command "javac" not found.
---- This command must be in the current working directory or
---- on the current system PATH or jGRASP PATH to use this function.
---- System + jGRASP PATH is "C:UsersQudrat.MommandiDocuments;C:Windowssystem32;C:Program Files (x86)InteliCLS Client;C:Progra
[code]...
I have the JDK installed in program files, I have the correct versions of eclipse and Jgrasp, and have uninstalled / reinstalled the JDK/Jgrasp/Eclipse so I don't know what the problem is?
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Feb 27, 2015
i have an older file I was working on 2 months ago and when i try to open it in eclipse I get a message corruption error. I know this is not possible since I was just working on it a while back, and it's the same program version as what i am currently using..Or would I do a file import instead?
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Mar 26, 2014
I am trying to .wav file using java eclipse ..
[B]import java.io.* ;
import sun.audio.*;
public class AudioDemo{
public static void main(String[] args)
throws Exception
[Code] ....
And I am getting the following errors ...
Exception in thread "main" java.io.FileNotFoundException: E:pppp.wma (The system cannot find the file specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at AudioDemo.main(AudioDemo.java:10)
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Apr 13, 2014
import java.io.*;
public class ReadNumbers
{
void input()
{
String File_name = "num.txt";
File numbers = new File(File_name);
[code]....
I am using eclipse and I went to file, add new file and named it num.txt:shot.png like show in the picture.
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Apr 17, 2015
I am trying web service first time so want to client application which will consume webservice which are hosted online for testing purpose
now i want to call some methods defined in this wsdl [URL]....
can anyone tell how should i invoke methods using stand alone java file no eclipse which jar files should i use ?
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Aug 11, 2014
I created a new project at eclipse with this code pasted inside a domApli container in a java file, I tried to run it but it wont work,
package domApli;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Prg2 extends JFrame implements ActionListener{
JLabel lblNom;
JLabel lblEdad;
JTextField txtNom;
[code]...
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May 12, 2014
I'm done with my project and I'm not trying to make it into a jar with JGrasp... I start by making a project then I click the option to make my project into a jar... Everything works but when I try to run it it says that the main class cannot be found... How can I fix this?
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Oct 7, 2014
I'm currently taking a Java Programming module in college, the program we are using is jGrasp and I'm currently stuck on one aspect of the language.
I did VB last year and I enjoyed it and got good grades so I'm comfortable with Java in terms of compiling the code correctly and getting it to run with no errors.
But for a project we got yesterday, the user must be able to enter data (e.g. an answer) into jGrasp without using a GUI. This is the case because we won't be dealing with GUIs until next semester.
I'm able to handle the rest of the project, but the part which I can't figure out is how the user can interact with jGrasp without the aid of a GUI.
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Oct 10, 2014
Java Code:
import java.util.Scanner;//Imports Scanner
public class operadoreslogicos//imports a public class {
public static void main (String [] args)//defines the state of a class {
Scanner input = new Scanner (System.in);//Inputs a scanner to read user
//keyboard
boolean cierto = true,// Declares variables as boolean and applies a value
[Code] .....
The word string is supposed to turn purple when I type it, but it just stays normal, so it doesn't declare hello and bye as variables.
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Oct 10, 2014
Basically, I have want to keep typing numbers and pressing enter and the same program keeps repeating itself. This is the code I need to repeat,
import java.util.Scanner;
class Averagecalc2 {
public static void main(String args []) {
Scanner input = new Scanner(System.in);
double num,
[Code] .....
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Feb 3, 2015
I keep getting the error Admit.java:10 cannot find symbol
import java.util.*;
public class Admit {
public static void main(String[] args) {
sayIntro();
Scanner console = new Scanner(System.in);
System.out.println("Information for applicant #1:");
getScore(console);
getGPA(console);
[Code] ....
The compiler then reads:
Admit.java:10: error: cannot find symbol
score1(ACTScore, SATScore, GPAScore);
^
symbol: variable ACTScore
location: class Admit
Admit.java:10: error: cannot find symbol
[Code] .....
10 errors
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Sep 6, 2014
We're learning printf with JGrasp as the environment at the moment. Heres the problem.
I have a string as this:
String header1 = new String ("Caswell Catering and Convention Service");
as for the printf line, its this:
System.out.printf ("%-5s/n", header 1);
The output is right justified no matter the use of the "-" or without and I can't seem to find the correct thing to do to make it left justified.
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Mar 4, 2015
Write a program named QuadraticTable.java that takes three double arguments and two int arguments (in that order) from the command line. The three doubles will represent a, b, and c from the quadratic formula.
If the discriminant is non-negative, find and print the solutions to the quadratic equation. (The plus/minus sign in the quadratic formula indicates that you would separately perform both operations). Otherwise print "no real solutions".
Then using the last two int arguments as x_min and x_max, print a table of x and ax
2 + bx + c
values using the a, b, and c read in as command line arguments.
Sample output: (command line arguments were 1 0 2 -3 3)
1x^2 + 0x + 2 has no real solutions.
X 1x^2 + 0x + 2
-3 11
-2 6
-1 2
0 2
1 3
2 6
3 11
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Sep 30, 2014
I have been trying to get this code to work but in jGrasp it give the no main method, applet, or IMDlet. The assignment states: Design a class Message that models an e-mail message. A message has a recipient, a sender, and a message text. Support the following methods:
-A constructor that takes the sender and recipient
-A method append that appends a line of text to the message body a method toString that makes the message into one long string like this:
"From:Harry Morgan
To: Rudolf Reindeer. . ."
Write a program that uses this class to make a message and print it. package emailmodel;
import java.util.Scanner;
public class Message
{
private String senderemail;
private String receiveremail;
[code]....
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Sep 13, 2014
The manager of a football stadium wants you to write a program that calculates the total ticket sales after each game. There are four types of tickets: box, sideline, premium, and general admission. After each game, the data is stored in a file in the following format:
ticketPrice numberOfTicketsSold
Sample data might look like:
250 5750
100 28000
50 35750
25 18750
The first line indicates that the box ticket price is $250 and that 5750 tickets were sold at that price.
Your program should input in this data (using Scanner or an input dialog box), then output that data to a message dialog box along with total ticket sales information. Output the total number of tickets sold and the total sale amount. Make your output user-friendly and "pretty". Format your output with two decimal places. Use JOptionPane and the formatting techniques learned in chapter 3 for your output. Example output might be:
5750 Box Tickets sold at $250.00
28000 Sideline Tickets sold at $100.00
35750 Premium Tickets sold at $50.00
18750 General Admission tickets sold at $25.00
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Nov 20, 2014
I know what the tree data structure is, how it works, etc., but I need to design a method that will sequentially print out all the paths in the tree (i.e. for each node).
The method as provided is
private static String getAllPaths(final BinaryNodeInterface<Character> root) { }
Now the string that must be returned needs to be of the format:
root.getData() + " " + path + "
"
root.getData()[1] + " " + path[1] + "
"
etc.
The pseudocode I was thinking of doing was something along the lines of:
paths
if(root.getData() = null) return paths;
path = ?; // absolutely no clue what to do here
paths += root.getData() + " " + path + "
";
if(root.hasLeftChild()) {
newPath += "0";
paths += begin recursion;
}
if(root.hasRightChild()) {
newPath += "1";
paths += begin recursion;
}
return paths;
Problems:
(1) I don't know how to determine "path" before the left and right children check (the root node's path is "", the first left node's path is "0", the first right node's path is "1", pattern continues with left being "0" and right being "1").
(2) I don't know where to put newlines precisely.
(3) I'm not sure how to get the print layout precisely as it is supposed to be. At most I've been able to just get the last number in the sequence (i.e. if it was supposed to be "1000", I could get "0".
I am working with the pseudocode formulation, especially in regards to the logic and formatting. I think once I have an understanding of what is going on, I can solve it. And yes, I've gone through a couple pseudocode rewrites (a few hours worth) and haven't gotten anywhere which is slightly unnerving.
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Apr 25, 2014
I can't get Relative paths to work. I have created the class.dat file and I can't get java to recognize it. I am using Eclipse as an IDE. Was wondering if I could get Eclipse to recognize it. I tried with a .txt file as well and couldn't get that to work.
import java.io.*;
public class ReadBytes
{
public static void main(String[] args)
{
try
{
FileInputStream file = new FileInputStream("class.dat");
[Code] .....
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Sep 19, 2014
Here is the objective of the assignment:
Quote : A bank in your town updates its customers' account at the end of each month. The bank offers two types of accounts: savings and checking. Every customer must maintain a minimum balance. If a customer's balance falls below the minimum, there is a service charge of $10 for savings accounts and $25 for checking accounts. If the balance at the end of the month is at least the minimum balance, the account receives interest as follows:
- Savings accounts receive 4% interest.
- Checking accounts with balances of up to $5000 more than the minimum balance receive 3% interest; otherwise, the interest is 5%.
Write a program that reads a customer's account number (integer), account type (character: s for savings or c for checking), minimum balance that the account should maintain, and the current balance. The program should then output the account number, account type, current balance, and an appropriate message.
Your program should only allow 'c', 'C', 's', or 'S' as valid input, any other character for the account type should result in an error message. Format your monetary output to two decimal places, and use constants for all the above constant values.
Sample output:
Please enter your account number (int), account type (char), minimum balance, and current balance:
46728 S 1000 2700
Account Number: 46728
Account Type: S
You have earned 0.04 interest on your account.
Current Balance: $2808.00
[Code] .....
Invalid account type!
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Sep 14, 2014
I print a path like below with iteration. It is redundant as you see. How can I remove the redundant path? im using arrayList .
1. [0, 1]
2. [0, 1, 2]
3. [0, 1, 3]
4. [0, 1, 3, 4]
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Aug 6, 2014
I am trying to make a GUI that allows the user to input the NumberLink puzzle (through mouse action events), and then, displays the puzzle in a grid with features to draw a path, and undo it. This is almost exactly the same functionality as in Numberlink on Nikoli
1. In my project, I have a Stage in which a setup scene prompts user for rows and columns (to take size of puzzle),
2. Then, it generates an empty grid (I'm thinking of using a GridPane here), and the user clicks the squares to enter the numbers into the square. this phase isnt a problem if I use text fields and mouse listeners and store info in a grid... the next phase is what I'm stuck at... unless I know exactly how to do that, I cant make progress...
3. In the third stage, I have to display the numbers to the user just like on the Nikoli site (the highlighting number pairs on mouse hover is a necessary feature too, which I think I can handle with CSS).. and the user should draw paths between the numbers, just as on that site ( I thought VLineTo and HLineTo classes would be suitable.. but I'm not sure, and cant find any alternatives) .....
So with this in mind, I made FXML based dummy gui layouts to test if my ideas work... And I cant get the GridPane to have lines drawing atop it (meaning, I cant place Line objects like HLine on top of the grid panes).... is there any other way to do what I need to do ? I also thought of making canvases in a grid (each square is its own canvas)
How I can implement a user inputted path drawing ??
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May 5, 2015
Is it possible to find the number of paths between two nodes in a directed graph using an adjacency matrix? I know how to find all said paths of a given length by using matrix exponentiation, but I don't know how to find all the paths. The professor didn't note it in the assignment but I assume she meant all simple paths because this is a cyclic graph, so there's a potentially infinite number of paths.
I'm thinking I should use matrix exponentiation to find the number of paths of lengths 1 to n-1, where n is the number of nodes in the graph. Then add the number of paths for each length together. Would this work?
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Oct 18, 2014
I've been pondering about this algorithm for about a week but I'm still not able to write a "fast" working method/algorithm to solve the Number-of-paths-exercise we were given in my class />
So here's the task:
Write an efficient java program "Paths" which solves the following task:
- Read input n ∈ N and give output a(n) which is the number of paths from (0,0) to (n,0)
it is not allowed to go over the diagonal (m,m) and also not below the x-axis (m,0)
Here are the allowed steps:
u = (1,1), U = (1,4), d = (1,−1), D = (1,−4) and H = (1,0)
steps are performed in a two-dimensional-coordinate-system!
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Apr 12, 2014
From a two-dimensional grid 5x5 that looks like this:
(0,0)(0,1)(0,2)(0,3)(0,4)
(1,0)(1,1)(1,2)(1,3)(1,4)
(2,0)(2,1)(2,2)(2,3)(2,4)
(3,0)(3,1)(3,2)(3,3)(3,4)
(4,0)(4,1)(4,2)(4,3)(4,4)
We have Starting point that is (3,0) and an ending point is (1,3). We can only move up and right to get to the ending point by using recursion. We have to list all possible paths from (3,0) to (1,3)
Example: paths:(3,0)(2,0)(1,0)(1,1)(1,2)(1,3)
(3,0)(2,0)(2,1)(1,1)(1,2)(1,3)
etc...
I was able to get from (3,0) to (1,3) but how to list the other paths. This is my code so far
public class Program7 {
public static void main(String[] args){
int size = 5;
int x1 = 3;
int y1 = 0;
int x2 = 1;
int y2 = 3;
System.out.println(x1+" "+y1);
System.out.println(x2+" "+y2);
int [][] path = new int[size][size];
grid(path,x1,y1,x2,y2);
[code].....
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Apr 12, 2014
From a two-dimensional grid 5x5 that looks like this:
(0,0)(0,1)(0,2)(0,3)(0,4)
(1,0)(1,1)(1,2)(1,3)(1,4)
(2,0)(2,1)(2,2)(2,3)(2,4)
(3,0)(3,1)(3,2)(3,3)(3,4)
(4,0)(4,1)(4,2)(4,3)(4,4)
We have Starting point that is (3,0) and an ending point is (1,3). We can only move up and right to get to the ending point by using recursion. We have to list all possible paths from (3,0) to (1,3)
Example: paths:(3,0)(2,0)(1,0)(1,1)(1,2)(1,3)
(3,0)(2,0)(2,1)(1,1)(1,2)(1,3)
etc...
I was able to get from (3,0) to (1,3) but how to list the other paths. This is my code so far
public class Program7 {
public static void main(String[] args){
int size = 5;
int x1 = 3;
int y1 = 0;
int x2 = 1;
int y2 = 3;
System.out.println(x1+" "+y1);
System.out.println(x2+" "+y2);
[Code] ....
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Jun 4, 2014
I am using Oracle Java 8 in Eclipse working on both Ubuntu and OSX. I have this code:
Java Code:
private static String getConfigDir(){
Path configDir = Paths.get(homeDir(), homeConfig(), appName());
return configDir.toString();
[code]...
But for the method get() of Paths, I get this error in eclipse.The method get(String, String[]) in the type Paths is not applicable for the argument..Yet on the Oracle documentation site, it uses a similar example:
Path p5 = Paths.get(System.getProperty("user.home"),"logs", "foo.log");
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Jun 5, 2014
I use git as my SCM and I use both Ubuntu and Mac OSX. The home directory of the two operating systems are different and there lies the problem. When I commit the .classpath to version control, it looks something like this:
Java Code:
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
<classpathentry kind="lib" path="/Users/MyUser/Documents/github/Gateway/GDGateway/java-json.jar"/>
<classpathentry kind="lib" path="/Users/MyUser/Documents/github/Gateway/GDGateway/postgresql-9.3-1101.jdbc41.jar"/>
<classpathentry kind="output" path="bin"/>
</classpath> mh_sh_highlight_all('java');
Now when I update my project on Ubuntu. I have to change the build path again because it is referencing paths on OSX. And this goes back and forth. Rather than remove this file from git with .gitignore, I'd prefer to use a global environment variable like as follows:
Java Code:
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
<classpathentry kind="lib" path="$HOME/Documents/github/Gateway/GDGateway/java-json.jar"/>
<classpathentry kind="lib" path="$HOME/Documents/github/Gateway/GDGateway/postgresql-9.3-1101.jdbc41.jar"/>
<classpathentry kind="output" path="bin"/>
</classpath> mh_sh_highlight_all('java');
Is this possible?
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