Stuck With A Logical Error
Jan 23, 2015
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JTextField;
[code]....
Total IS those numbers. But question[10] will not cooperate with me and it's getting a bit aggravating as I can't find a logical reason for it to be doing that.how to perhaps lock the value of total and sTotal after 10 button clicks from any?
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Aug 12, 2014
I was almost finished with my program when I noticed I had a big logical error. At the very beginning of my else if statements I would jump down to my else statement.
Java Code:
import java.util.Scanner;
public class InternetServiceProviderNew
{
public static void main(String[] args) {
double packageA, packageB, packageC, extraA, extraB, userHours, aHours, bHours, cHours, userCharges;
packageA = 9.95; packageB = 13.95; packageC = 19.95; aHours = 10; bHours = 20;
String userPackage, A, B, C ;
[code]....
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Oct 14, 2014
I am working in the field of validating data. I need to validate names and test scores and i keeping getting errors in my code. I keep tracing back all the errors and now I am stuck at a logic error. It is giving me a the validate sentence over and over even when i type stuff in. I have searched up how to do the .equals to a string but it doesn't give me a accurate enough to my problem.
import java.util.Scanner;
public class P5A
{
public static void main (String args[]) {
System.out.println( "Always Show" );
Scanner reader = new Scanner(System.in);
[Code] .....
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Sep 2, 2014
I'm getting an error trying to run a welcome app from a book. I've looked at the FAQs and can't seem to solve the issue. I'm guessing my path and/or classpath are not right. Here's my path environment variable.
C:jdk1.8.0_20in;C:ProgramDataOracleJavajavapath;C:Program Files (x86)NVIDIA CorporationPhysXCommon;C:Program Files (x86)InteliCLS Client;C:Program FilesInteliCLS Client;%SystemRoot%system32;%SystemRoot%;%SystemRoot%System32Wbem;%SYSTEMROOT%System32WindowsPowerSh
[Code] ....
Here's my output.
09/01/2014 10:23 PM 634 Welcome.class
09/01/2014 10:21 PM 422 Welcome.java
14 File(s) 126,243,703 bytes
9 Dir(s) 53,942,079,488 bytes free
[Code] .....
It looks like the version command gives me what it should, so it appears I've got java setup right, but I"m stuck on the error I'm getting :
C:jdk1.8.0_20>javac -version
javac 1.8.0_20
C:jdk1.8.0_20>
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Nov 11, 2014
I've created a truth table for logical operators. Now I'm supposed to alter the code so the table prints 1's and 0's instead of true or false. Here's a bit of the original code - just the header and the first line of the table.
System.out.println("p q AND OR XOR NOT");
System.out.println();
boolean p, q;
p = true; q = true;
System.out.print( p + " " + q + " " );
System.out.print( ( p & q) + " " + ( p | q) + " ");
System.out.println(( p ^ q ) + " " + ( !p) );
All of my ideas involve using an if-then statement, but that would be all kinds of inefficient and unwieldy, I think.
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Jan 5, 2015
The title says already where my difficulties are. I forgot to say, the "S" printing part works, but why the others doesn't. To make it more clear:
java Monoton 1 3 3 4 & java Monoton 1 3 4 1
=> nothing (my output)
I forgot to notice, with 1 3 3 4 as parameters it jumps out at if (b < c), which is expected. but it jumps out of the whole if instead just run the else part. that's the essence of my problem.
The Exercise:
=> The program should print the following letters;
S, if every number is true bigger than the before,
M, if every number is bigger or equal than the before,
N in the other cases
Examples (from the exercise)
=> java Monoton 0 1 2 4
S
=> java Monoton 1 3 3 4
M
=> java Monoton 1 3 4 1
N
The Exercise should done without the use of logical operators or other combined requirements.
Java Code:
public class Main {
public static void main(String[] args) {
int a = Integer.parseInt(args[0]);
int b = Integer.parseInt(args[1]);
int c = Integer.parseInt(args[2]);
int d = Integer.parseInt(args[3]);
[Code] .....
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Feb 3, 2015
How to save (condion1 & condition2) | condition3 |(Condition5 & condition6) etc in database and how to retrieve it.
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Apr 12, 2014
Assuming that x, y, and z are integer variables, which of the following three logical expressions are equivalent to each other, that is, have equal values for all possible values of x, y, and z?
(x == y && x != z) || (x != y && x == z)
(x == y || x == z) && (x != y || x != z)
(x == y) != (x == z)
None of the three
A. I and II only
B. II and III only
C. I and III only
D. I, II, and III
I selected B, but got it wrong. I really think I need understanding boolean logic. The correct answer says something else but I don't get the logic. Here is the correct answer:
Answer Key : The following model answer has been provided to you by the grader. Carefully compare your answer with the one provided here.
Expression III is the key to the answer: all three expressions state the fact that exactly one out of two equalities, x == y or x == z, is true. Expression I states that either the first and not the second or the second and not the first is true. Expression II states that one of the two is true and one of the two is false. Expression III simply states that they have different values. All three boil down to the same thing. The answer is E.
In exercise 4, I get the same problem:
The expression !((x <= y) && (y > 5)) is equivalent to which of the following?
A. (x <= y) && (y > 5)
B. (x <= y) || (y > 5)
C. (x >= y) || (y < 5)
D. (x > y) || (y <= 5)
E. (x > y) && (y <= 5)
Exercise 4
ABCDE
Incorrect
Score: 0 / 1
Submitted: 2/10/2014 8:21pm
Your answer is incorrect.
Answer Key
The following model answer has been provided to you by the grader. Carefully compare your answer with the one provided here. The given expression is pretty long, so if you try to plug in specific numbers you may lose a lot of time. Use De Morgan's Laws instead:
!((x <= y) && (y > 5))
!(x <= y) || !(y > 5)
When ! is distributed,
&& changes into ||, and vice-versa
(x > y) || (y <= 5)
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May 12, 2015
I am thinking of a project for my university the teachers liked it but I am not sure if its even possible.I am trying to make an andriod app. What I want to do is take a picture of a hand drawn logic circuit (having the AND, OR, NOT ... gates) recognize the gates, and make a circuit in the moblie and run it on all possible inputs.
For this I will have to make a simulator on mobile, that I dont think is the hard part. The problem is how could recognize the gates from a picture. Example of logical circuit is attached ( assume its hand drawn )..I found out that theres a edge detection plugin in java but still I dont think its enought to recognize the gates. Please share any algorithm or any technique or tools that I can use to make this thing.
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May 18, 2014
I'm doing a project in netbeans. I have to make a on-line bank with all the GUI. In the middle i got stuck with the classcastexception..
public class Banca {
public static void main(String[] args) throws IOException, ClassNotFoundException {
// dati dei clienti
Anagrafica c = new Anagrafica();
[code]...
And here's the class of the activities of an account.. I'm not posting my classes Conto( Bankaccount) & Movimento (Activity) because those two already do what they should..
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Mar 16, 2014
I'm trying to do the following and my code is putting me in a loop and not allowing me to input a valid entry after using an invalid #.I ask the user for input which contains a loop if the user doesnt use the correct information, however the loop doesnt allow the user to input if the entry fails the which statement
import javax.swing.JOptionPane; // Needed for JOptionPane class
public class LoanQualifier
{
public static void main(String[] args)
{
double salary; // Annual salary
double yearsOnJob; // Years at current job
String input; // To hold string input
// Get the user's annual salary.
input = JOptionPane.showInputDialog("Enter your " +
[code]....
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Oct 6, 2014
I have this code running correctly in Eclipse all except that it seems no matter where I declare, highest, lowest, average they always seem to stay at "0". I have a feeling the location of the Initialization is not the error since I have tried moving it to inside differ loops.
Stipulations on writing this code are:
Note: You do not need to use array to save each input score for this lab. A Single loop to read in each grade, compare with the current highest grade, lowest grade, and calculate the running sum at the same time.
import java.util.Scanner;
/*Write a program that prompts the user to enter the total number of students first.
*Then ask the user to input each student’s grade and use loop statements to read in each grade.
*Check input grade to make sure 0<=grade<=100, if the user input any other number, print out warning message and ask the user to input a new grade. Display the highest score, the lowest score and the average.
*/
public class LoopStatements {
// Main Method
public static void main(String[] args) {
// Initialize
int grade = 0; // grade value
[Code] ....
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Mar 19, 2014
How to use a constructor with parameters where the user inputs the information? I'm doing a problem where I create a Delivery class that accepts arguments for the year, delivery number within the year, distance code (1 for short distance, 2 for long), and weight of package. The constructor is supposed to also determine the eight digit delivery number (combining the year and delivery number, like 20140054 for this year, package #54).
I know I'm not close to being done but I'm struck on the application with the constructor parameters. If I'm asking the user to input the information, does that mean I have to create a no argument constructor so it will compile? Right now it won't compile because it's asking for the parameters but I can't put them.
This is the class:
public class Delivery {
int year;
int delNum;
double weight;
int code;
[Code] .....
And the error is:
CreateDelivery.java:22: error: constructor Delivery in class Delivery cannot be applied to given types;
Delivery firstDelivery = new Delivery();
^
required: int,int,int,double
found: no arguments
reason: actual and formal argument lists differ in length
1 error
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Sep 26, 2014
I'm writing a temperature converter for class, and I'm done but one piece that I can't wrap my head around.My input scale radiobuttons work fine, but the output scale radiobuttons don't deselect automatically. They're two different button groups and I wrote them identical save for the variable names.
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
[code]....
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Apr 13, 2014
I am having trouble grasping 2 dimensional arrays .I have a certain problem:
String[][] words = {
{"Red", "Blue", "Green"},
{"Orange", "Purple". "Yellow"}
[code]....
I ran the code and got OrangePurpleYellowRedBlueGreen.
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Jul 1, 2014
Write a method called isSorted that accepts an array of real numbers as a parameter and returns true if the list is in sorted (nondecreasing) order and false otherwise. For example, if arrays named list1 and list2 store {16.1, 12.3,22.2, 14.4} and {1.5, 4.3, 7.0, 19.5, 25.1, 46.2} respectively, the calls is Sorted(list1) and isSorted(list2)should return false and true respectively. Assume the array has at least one element. A one-element array is considered
to be sorted. public class thirfd {
public static void main(String[] args) {
double[] arr1 = {16.1, 12.3,22.2, 14.4};
double[] arr2 = {1.5, 0.3, 7.0, 19.5, 25.1, 46.2};
isSorted(arr2);
System.out.println(isSorted(arr2));
[code]...
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Feb 13, 2014
I have spent some time thinking about the program, and realize I need two loops-- 1 that keeps track of bricks in a row and 1 that keeps track of the number of rows as the Pyramid rises in height. The Pyramid is supposed to be centered on the bottom of the screen. Three CONSTANTS have been required:
BRICK_WIDTH=30, BRICK_HEIGHT=12, BRICKS_IN_BASE=14.
I tried breaking the scope of things down by trying step-wise refinement. But, I got bogged down. When I tried a method where both loops were included, I got limited success. For some reason, my equation to center along the x axis seems to be doubling the number of bricks. But, the correct number of total rows of bricks was a success. Also, the Pyramid was centered on the bottom of the screen. Another frustrating failure was that the number of bricks would not decrease as the new layers were created. My thought process was instead of using a loop that counts up (i++) I would use a loop that counts down (j--) which I thought would reduce the number of brick in each row as the "y" coordinate was reduced by each count of the BRICK_HEIGHT.
This is the code that "works". Whenever I add the (j--) the results are NOT what I expect.
/*
* File: Pyramid.java
* Name:
* Section Leader:
* ------------------
* This file is the starter file for the Pyramid problem.
* It includes definitions of the constants that match the sample run in the assignment,
* but you should make sure that changing these values causes the generated display to change accordingly.
*
[code].....
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Feb 18, 2014
here's my code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class Milimetri extends JFrame {
private JPanel p1 = new JPanel(new FlowLayout(FlowLayout.LEFT));
private JPanel p2 = new JPanel(new FlowLayout(FlowLayout.LEFT));
private JPanel p3 = new JPanel(new FlowLayout(FlowLayout.LEFT));
[code]...
When i write a value in meters ..and press the button b1 to show me a value in milimeters..
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Feb 2, 2015
I am trying to make a custom table for a DB and i am stuck.
I want only the first column to have a checkbox and others not.
Is there a better way to insert the values instead using the getValueAt ?
@Override
public Object getValueAt(int row, int col)
{
if (col == 0)
[Code].....
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Nov 4, 2013
my application (java 6 RedHat 5.3 x64 ) using clean content jar for extracting data from email messages with attachments (doc, xls, ptt ...etc) After update from CleanContent-2009.1.1.jar to CleanContent-2011.1.1.jar (and any newer version) CompilerThreads will stuck in some cases (pretty often) In that case CPU usage is 100% all time, even when all activities on application are finished.
I was able to isolate several messages and every time when I used CleanContent-2009.1.1.jar it works ok but always stuck with CleanContent-2011.1.1.jar or newer versions!
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Aug 1, 2014
The goal of this code was to create a program using main method java to analysis a piece text which has been entered from a user.
They do this by entering the text into a scanner which is then analysed by the program. The analysis is to produce word frequency, for example " This is a test" produces this results:
This is a test
1 letter words: 1
2 letter words: 1
3 letter words: 0
4 letter words: 2
5 letter words: 0
The bit that I'm stuck on is producing a mean/average, My mind telling to divide
counts.length
by
str.length
But I'm not the Best at java and I've tried to implement this but all I get are errors.
Code:
import java.util.Scanner;
public class While_Loop {
public static void main (String[] args) {
while(true){
[Code] .....
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Apr 13, 2014
I think I'm about 90% complete with this program but I'm stuck on my adding entries method. It gives me a runtime error which says:
Enter the name:
Bill
Exception in thread "main" java.lang.NullPointerException
at Phonebook.addEntry(Phonebook.java:70)
at Phonebook.main(Phonebook.java:49)
Here is my code:
/*
* This program asks the user for input for a name, phone number and notes up
* to 200 entries. It stores every contact in a file. Type 'h' for help while
* running this program.
*/
import java.util.Scanner;
import java.io.*;
[code]....
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Jul 19, 2014
Basically I have a class called Book. Its supposed to have a few simple methods that set the title of the book, mark it as returned or borrowed. So specifically my problem lies in the implementation of the method that decides if the book isBorrowed. I was thinking i'd use a simple if/else statement but the way i've been trying hasn't been successful. This is what i've tried so far.
public class Book {
String title;
boolean borrowed;
boolean returned;
boolean isBorrowed;
// Creates a new Book
public Book(String bookTitle) {
[Code] .....
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Mar 14, 2014
The problem i believe is that I have the max value set to the first value given out, but every time the loop repeats the Max value gets reset to the next value in the file.
Essentially the program is supposed to read a list of credit card transactions and tell the user which transaction is the highest.
Here's the list of the sample file, note that the number of transactions could change that's why i haven't tried simply passing the values to method.
Bicycle 562.90
Groceries 138.43
Hotel 612.00
import java.io.File;
import java.io.IOException;
import java.util.Scanner;
public class CreditCards {
public static void main(String[] args) throws IOException {
String fileName = "C:/Users/David/Desktop/CreditCard.txt";
File inputFile = new File(fileName);
[Code] ....
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Oct 3, 2014
public class TicTacToeGame {
public static void main(String[] args) {
char [][] board = new char [3][3];
displayboard(board);
int count = 0;
boolean loop = true;
[Code] ....
I also try with check if the move is vaild but no luck with that.
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Jan 31, 2014
I have a tooltip implemented on a main page, but when you click the link tooltip box gets stuck on next page
<h:outputText value="#{it.get(newItem.strCampoNombre)}" rendered="#{newItem.strCampoTipo == '1' or newItem.strCampoTipo == '5' or newItem.strCampoTipo == '4' or newItem.strCampoTipo == '9' or newItem.strCampoTipo == '10' or newItem.strCampoTipo == '11'}" />
<h:outputText value="#{it.get((newItem.strCampoToolTip))}" rendered="#{newItem.strCampoTipo == '8'}" />
<rich:tooltip styleClass="tooltip" layout="block" rendered="#{newItem.strCampoTipo == '8'}" showDelay="500" onhide="false" hideEvent="mouseleave">
<span class="wrap"> <h:outputText value="#{it.get(newItem.strCampoNombre)}" /> </span>
</rich:tooltip>
problem.png
I tried to change the tooltip parameter but didnt find the solution.
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