Java :: Printing Final Calculation With Correct Formatting

Creating Final Arrays With Final Elements

Aug 2, 2013

I want to create a final array with final elements

{code}
final int[] array = {0, 1, 2, 3, 4, 5};
{code}

But here only the reference of the array is final , not it's elements ... So how can I do that??

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Different Units In Calculation

Sep 8, 2014

I have a maths application I am working on in java. This is more related to maths but there could be some here who have worked with calculations like this in their java project.

One could convert from degree to radians and from mph to knots. Could one convert from knots to degree or from mph to degree?

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Tax Calculation Program

Apr 9, 2014

use arrays to store taxpayer information. Use methods for tasks that will be repeated.

-Ask the user how many taxpayers he would like to calculate taxes for.
-Ask the user to enter each taxpayer's first name, last name gross income, and number of children.
-Each taxpayer's tax due is computed as follows
-The taxpayer's dependency exemption is determined by multiplying $3,000 times the number of children.
-The taxpayer's net income is determined by taking the taxpayer's gross income and subtracting the taxpayer's dependency exemption.
-If the taxpayer's net income is between 0 and 50,000, the tax due is 15% of net income.
-If the taxpayer's net income is greater than 50,000, the tax due is
-15% of the first 50,000 of net income PLUS
-25% of any income over 50,000
-The tax due can never be less than 0.
-If the net income is a negative number, the tax due is 0

TAXPAYER INFORMATION: output a message in one dialog box which lists the following info for every taxpayer: first name, last name, gross income, number of children, tax due.
AVERAGE TAX: output a message in a dialog box which states the average of the taxes due.
PRESIDENTAL MESSAGE: output a message in a dialog box which says either "We computed taxes for the president. " or "We did not compute taxes for the president." The president's name is Barack Obama.

Here is my code so far

import javax.swing.JOptionPane;
public class AssignmentSeven
{
public static void main (String [] args)
{
String [] taxPayers;
String[] firstName;
String [] lastName;
String message = "";
double[] grossIncome;

[code]....

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Calculation In Awt Calculator

Jul 10, 2014

I am facing problem during calculation in my awt calculator. It is showing NumberFormatException. Below is part of code.

if(e.getSource()==b14)//On button 14, label is "/"
{
String v1=tf.getText().toString();
num1=num1+Integer.parseInt(v1);//num1 is as integer variable
tf.setText("");//tf means textField
}else

[code]....

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Java GUI Calculation

Oct 3, 2014

how to do this last calculation. I want the user to input and odometer (in feet) and have it use that and the Duration (in hours) to calculate speed in feet per second. Ive been trying to reference it using various methods but I'm stuck. I have it set as a string but whenever i try to pretty much use somewhat the same formula i did for total time it just gives me errors. How do I use that number the user inputs into a formula with the output of the Duration?

* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package javaapplication1;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JOptionPane;

[code]....

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Writing A Calculation For A Program?

Sep 8, 2014

I am writing a program in Java where a user adds 1 stamp on a letter for every five sheets of paper in it (or fraction thereof)For example, I if I have 11 sheets of paper, I add 3 stamps. If the total number of stamps is more than 3, they don't send it.

I need to ask the user how many sheets of paper they have, and then calculate the appropriate number of stamps based on the formula above. I just don't know how to write the math formula to calculate this, i'm stuck. So far I have:

package test;
import java.util.Scanner;
public class LetterMailing {
public static void main(String[] args) {
Scanner stdIn = new Scanner(System.in);
int numSheets;

[Code] .....

What should I do next?

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Netbeans - Calculation In GUI Interface

May 12, 2014

I'm trying to create a GUI interface in Netbeans that calculates a phone bill.

I created a GUI interface that input:
- Account Name.
- Account Number.
- Number of Minutes the phone was used. (with a textarea so the user input the minutes)
- 2 JRadioButtoms so the user can chose the regular or premium service.
- Amount Due (+10% taxes) (also with a textarea)
- Clear/Enter/Result/Done Buttoms

And I need to output:
- Account Name.
- Account Number.
- Number of Minutes.
- Taxes
- Total Amount Due.

I have a couple of math formulas I have to add them to output the above however I'm new to java so I don't know which code to use.

The math formulas are:
-Regular charges = 20 + ( No. Minutes - 50 ) * 0.20
-Premium charges = 50 + ( No. Minutes - 75 ) * 0.50
-Taxes = ( Regular charges + Premium charges ) * 0.10
-Amount Due = Regular charges + Premium charges + Taxes

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Efficient GCD Calculation And Long For Loops

Jan 23, 2014

My GCD testing:

Java Code:

public static long gcd(long a, long b) {
if(b == 0) {
return a;
} else {
return gcd(b, a % b);
}
} mh_sh_highlight_all('java');

Is there a more efficient way? Also, what can I do to speed this forloop up?

Java Code:

for(long i = 1; i < 750000; i++) { dothis; } mh_sh_highlight_all('java');

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Calculation - Sorting Books By Rating

Jun 19, 2014

I have a calculation that sorts books by rating...

System.out.println("
" + "
Sorted by Rating
");
for (int count = 0; count < bookL.size(); count++) {
for (int in = 0; in < bookList.size() - 1; in++)
if (videoList.get(in).getRating() < bookList.get(in + 1).getRating()) {

[Code] ....

What am I missing here? Why doesn't this work?

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How To Get Calculation To Work Using User Input From Textfields

Feb 23, 2014

As stated in the subject I'm a newbie when it comes to Java Programming (I'm in my second week of class). I'm trying to create a Retail Calculator for a class and need to multiply two values together (Price, Discount) in order to get the sale's price when the user hits a Calculate button. The price and discount are user input values from textfields in the beginning of the code.

public void actionPerformed(ActionEvent e) {
String price;
String discount;
float salePrice;
//Get the original price from price textfield
price = priceValueField.getText();

[Code] ....

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String To A Double In Scanner - Performing Calculation?

Apr 23, 2015

This may be a multipart question. Basically I have to write a program that accepts a string, converts it to a double splits it and then performs a calculation.

public static void main(String[] args) {
String input = ""; // initalize the string
boolean isOn = true; // used for the while loop...when false, the program will exit.
String exitCommand = "Exit"; // exit command
String[] token = input.split(("(?<=[-+*/])|(?=[-+*/])"));

[Code] ....

This is the error I get:

Enter a math problemException in thread "main" java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(Floa tingDecimal.java:1842)
at sun.misc.FloatingDecimal.parseDouble(FloatingDecim al.java:110)
at java.lang.Double.parseDouble(Double.java:538)
at Calculator.main(Calculator.java:22)

[Code] .....

How do I go about actually fixing it. Without that line commented out I get this:

Enter a math problem
2+2 <-What I entered
[Ljava.lang.String;@135fbaa4

Also, how would I go about using the submethods to check for valid operands and operators (also part of the problem) I have the actual lists made obviously, but am unsure how to get those to work with the problem.

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Converting Double Values (0.0-110.0) To A 4.0 Scale (as Used In GPA Calculation)

Sep 3, 2014

I am new to programming, but am working on a program that takes 6 inputted grade averages on a scale of 0.0 - 100.0 (exceptions in the case someone has exceeded the traditional 100.0 limit) and then divides it by 6 and returns the value in a dialog box. However, I want to take the values inputted and convert them to a 4.0 scale (90.0-100.0 = 4.0, 80.0-89.99 = 3.0, etc.) and then get the average of that so that I can return an average on a 4.0 scale. I have been trying to accomplish. Also, as of right now my program only prompts the user for 6 inputs, but I'd like the user to be able to input as many as he/she would like to, I am pasting the code I currently have below.

import javax.swing.JOptionPane;
public class GPA_Calculation1_0 {
public static void main(String[] args) {
String courseOne = JOptionPane.showInputDialog("Enter numeric GPA of Course One: ");//Course one
double numOne = Double.parseDouble(courseOne);

[Code] ....

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Passing Variable From Class A To B To Do Calculation But Getting Error?

Mar 23, 2015

I'm getting this error, I definitely know that is my error trying to pass method/variable because when I commented received part of my code it ran and worked.

I get this error

at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Here are my 2 classes

Java Code:

import java.awt.BorderLayout;
import java.awt.Checkbox;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

[Code] .....

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Make Session Attribute To Store New Value After Calculation?

Dec 29, 2014

why my session attribute for this banking webapp wont add the deposits to the session var... it just keeps going back to the amount I set it to originally - so if I set the beginning balance to 3000 then deposit 100 it becomes 3100, but if I then try deposit another amount eg. a extra 200 it becomes 3200 not 3300 like it should be !!

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.net.*;
import java.text.DecimalFormat;

[code]....

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Age Calculation Based On Input (Date Of Birth)

Nov 9, 2014

I am trying to solve this problem but it is not working properly, when i enter the date of birth, such as 1993 12 14 it comes up as 21 years old instead of 20.

import java.util.*;
class Age
{
public static void main( String [] args)
{
Calendar rightNow = Calendar.getInstance();

[Code] ....

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Make GUI To Calculate Orders And To Save Calculation To CSV File

Feb 1, 2014

My assignment is to make GUI to calculate orders and to save the calculation to .csv file.I have solved "save" button and it really does save my input to .csv file.But, my problem is "Load button" When I press it, how to load .csv file to my existing JTextFields?

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Calculating Average Of Two Arrays - Calculation Coming Out Incorrect

Oct 8, 2014

I am working on an assignment, and I have come up with a program that runs, but it does not run correctly. This is the assignment:

Write two overloaded methods that return the average of an array with the following headers:

public static int average(int[] array)
public static double average(double[] array)

Write a test program that prompts the user to enter ten double values, invokes this method and displays the average value.

When I run it my averages are coming out incorrect, and I am not sure why. I have tried moving and rearranging things and nothing is working.

Java Code:
public static int average(int[] array) {
int sum = 0;
int average = 0;

[Code].....

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Java Fraction Calculation Compiles But Output Is Wrong

May 9, 2014

So all the errors in the code is fixed but its now got the wrong output

what I get:

Enter numerator; then denominator.
5
8
5/8
Enter numerator; then denominator.
4
10
4/10
Sum:0/0

it should be:

Enter numerator; then denominator.
5
8
5/8
Enter numerator; then denominator.
4
10
4/10
Sum: 82/80 1.025
Product: 20/80 0.25
Enter numerator; then denominator.
6 0
infinity

here is the code

Fraction.java
public class Fraction { //declares that it's a class that can be intantiated
private int numer; // private intager for numerator
private int denom; // private intager for denominator

[Code] ....

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Perform Mathematical Calculation Between Two Numbers Entered By User

Feb 16, 2015

I need to write a Java program to perform a mathematical calculation between two numbers entered by the user. User has to choose the mathematical operation and input it and then when the user enters 2 numbers, he gets the answer. When user enters any other character other than *, /, + and - he should be able to exit. Perform calculation between numbers should be until user decided to exit from the program. My code is below, calculation part goes well, but can't get it exit when user enter any other character.. How to fix it?

import java.io.*;
public class q11
{
public static void main(String[]args)throws IOException
{
InputStreamReader ISR=new InputStreamReader(System.in);
BufferedReader BR=new BufferedReader(ISR);
while(true){
System.out.println("Enter..");
System.out.println("* : For multiplication");

[Code]...

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Why Constructor Cannot Be Final

Oct 27, 2014

"A constructor cannot be abstract, static, final, native, or synchronized."

I understand on why it can't be all of the above, except "final".

Why can't we have a final constructor, i understand constructors are not inherited, hence no chance/case of overriding etc. But why is it not allowed at all ?

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Final And Static Method?

Feb 7, 2014

My teacher has asked me one question that "What is difference between the final method and static method".

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Double RelativeFrequency Value Which Does Calculation / End Result Is Number With Lots Of Decimal Numbers

Nov 24, 2014

for (int i = 0; i < letters.length; i++) {
double relativeFreq = (onesAverage()/letters[i]);
char a = characters.charAt(i);
double j = score[i];
System.out.printf();//ToDo

Above is my current code. Basically- There is a string called characters of length 26 (1 char for each letter in alphabet), a double relativeFrequency value which does a calculation and the end result is a number with lots of decimal numbers. The score array has set double values within the array.

What I want to do is create a print f statement where I print out each of the values I initialized above WITH specific amounts of spaces in between. So it should be in this order:

a (spaces) j (spaces) relativeFreq (newLine).

Between J and relativeFreq there should be 4 spaces, however if the value in relativeFreq is greater than 10 (it won't be greater than 100)- then there should be 3 spaces. Everytime I try to create a printf statement my code ends up crooked for some of the values.

for (int i = 0; i < letters.length; i++) {
double relativeFreq = (onesAverage()/letters[i]);
char a = characters.charAt(i);
double j = score[i];
System.out.printf("%c %.4s %.4s%n",a, j, relativeFreq);

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Why Are Final And Abstract Called As Modifiers

Feb 8, 2015

I just wanted to know that why are final and abstract called as modifiers ,what is the essence of calling them as modifiers since there are two types of modifiers access modifiers and non-access modifiers so final and abstract come under the second category ,so why are these called as modifiers?

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Final Reference Variables In Java

Feb 28, 2015

I am unable to understand the meaning of this sentence "final reference variables must be initialized before the constructor completes.",What is trying to imply?