Will ValueOf Of String Ever Lose Data With Double?

Jul 5, 2014

I have a double primitive and gave it a huge value. I am curious if valueOf could ever potentially cause data loss. I tried a simple test and it seems it never loses any data:

Java Code:

public class DoubleStringTest {
public static void main(String[] args) {
double val = 1029.129348558634;
System.out.println(val);
System.out.println(String.valueOf(val));
}
} mh_sh_highlight_all('java');

Does this always hold true?

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User Input Data As String And If Verified As Valid Number Then Convert Into Double

Nov 11, 2014

I am writing a code in which a user inputs data as a string and that data must be verified as a valid number. A valid number is anything from 0-100. Then all valid numbers are converted into double numbers.

I am having trouble in how to write the validation part of the code.

Is it suppose to be an if, else statement? And if so how is it suppose to be validated?

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How To Print Stack Without Destroy Or Lose It

Nov 14, 2014

Im trying to print a stack in the client level but when I print it , in this code I lose the data and the stack will be Empty

if(current.getname().equals(name)){
temp=current.getTransactions();
while(!temp.isEmpty() )
System.out.println(temp.pop().toString());

[code]...

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Double Data Type Outputting To Exponent?

Nov 9, 2014

I was struggling to use BufferedReader to extract some data and then perform some calculations and then have the results as outputs.

I haven't quite solved that issue but in order to progress, I hard coded some values into my application and proceeded with the actual calculation loops etc.

Currently, the value out put from one of my calculations is given as:

1.1704926E7

How can I make the console show it in a natural way. I've performed the calculation manually and it should be 11704926.5 I don't want to lose that .5!

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Unable To Use Double Data Type In For Loop

Aug 12, 2014

I am trying to use double data type in a for loop for precise operations and just to see if there could be any problem doing that I tested a small code :

public class doubleLimit {
public static void main(String[] args){
for(double i=-0.1;i<=0;i+=0.01)
System.out.println(i); }}

The output I was expecting is :
-0.1
-0.09
-0.08
-0.07
-0.06
-0.05
-0.04
-0.03
-0.02
-0.01
0.00

But the output of the code is :
-0.1
-0.09000000000000001
-0.08000000000000002
-0.07000000000000002
-0.06000000000000002
-0.05000000000000002
-0.040000000000000015
-0.030000000000000013
-0.02000000000000001
-0.01000000000000001
-1.0408340855860843E-17

Why is the code not working the way I expected, I think it has something to do with any property of double but I am not sure.

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Edit Data Of JTable Using Default Double Editors

Feb 5, 2015

As shown in the SS I show the data of the batch from the db.Now I want to edit the data of the jtable using the default Double editors and also show the data using a Date renderer in dd/MM/yyyy format.The problem is when the data is loaded from the db,I am not knowing how to implement and set the editors to double and date.I am new in java.The code of the above is shown as follows.

Java Code:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package Billing;
import java.awt.Component;
import java.sql.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

[Code]...

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Java Generics - Why Cannot Use Primitive Data Type Like Int / Double

Feb 21, 2014

I have doubt in generics,

List<int> c=new ArrayList<int>();

why we cannot use primitive data type like int,double.

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JSP :: Get Double Data Type In Order To Display In The View Through Servlet

Dec 16, 2014

How to get a double data type in order to display in the view through a servlet:

objReferencias.setImprevistos(request.("imprevistos"));

Question:

request.getDouble("imprevistos));? or
request.getDoubleParameter("imprevistos));?

I've been searching but I have not found the appropriate answer.

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Double To Hex String Conversion

May 8, 2014

I am trying to convert the double 4270571936.0000000000d to a hex string using Double.toHexString() and the answer I'm getting is 0x1.fd17834p31, what does p stands for?

The answer I'm expecting to get is 0x41efd17834000000 so not sure why it won't give me the correct answer?

The following floating point Double to hex calculator shows the write answer right Floating Point to Hex Converter

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Cannot Convert From String To Double

Oct 4, 2014

//Students Full Name
firstName = JOptionPane.showInputDialog("Enter student " +
"first name.");
lastName = JOptionPane.showInputDialog("Enter student " +
"last name.");
// Get test grade (numbers)
[b]test1 = JOptionPane.showInputDialog("Enter test1 grade")[/b];

The line in bold is where that error comes up. I know it something simple but I can't remember. I declared both firstName and lastName as Strings and then the test1 I declared as double. I had a similar error in a previous assignment where I had a integer(age) input and then i had an output statement asking for a name all I needed to do was put keyboard.nextLine(); after my age input and I was fine.

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Typing Double Name In The String

Oct 26, 2014

I am making a program where the user types in how many students, the student name and the student result. My problem is typing in a dobule name for instance: Tom Tom.

I have tried both:

String name = input.Next(); -> Only works with one name.
and
String name = input.nextLine(); -> Skips right trough and ask me to type result again.

Here is my code:

Java Code:

import java.util.Scanner;
public class c5e8 {
public static void main(String[]args){
Scanner input = new Scanner (System.in);
int highestResult = 0;
String highestName = " ";

[Code] ....

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String Method To Return A Double

Jul 11, 2014

I'm having an issue with figuring out how to structure and call a method using a string prompt. My prof has given us specific methods to create, and the one I'm having issues with is blic static double getOperand(String prompt). What I have currently is this:

public static double getOperand(String operand1, String operand2){
Scanner input = new Scanner(System.in);
System.out.println("What is the first operand?");
operand1 = input.toString();

System.out.println("What is the second operand?");
operand2 = input.toString();
return operand1, operand2;
}

which is obviously not working. When I asked my prof he sent me this, "The String paramater in the getOperand() method is intended to have the prompt value that is passed to it. Within the method, the prompt is then displayed, what the prompt is asking for is input, and then returned to the method call.For example, if the method is public double getOperand(String prompt) within the method you would display the prompt, as in System. out. println(prompt), use the Scanner class to create an object, perhaps called input, and then use the input object to get the value asked for by the prompt. Once you have that value, which in this example would be a double, then return the value to the method that called it.

The call could be something like this: double value = getOperand("What is the first operand?");". But that only works a little. Clearly I'm missing something and no matter what I google, or how many times I read the chapter, I am just not getting this. Everything else up to this point has been easy. and I can create regular methods just fine, the menu method works, but I can't figure out this string method and all the rest build off this method.

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Converting String Input To Double

May 2, 2014

I am supposed to write a program on PuTTY using UNIX (I have Windows 8), but I am not comfortable with it yet, so I am using Java through NetBeans (IDE 7.4).

The program has to follow these instructions (ignore the Linux part of the instructions, the rest is in bold):

Write a program on the Linux system using the putty utility. The program should get strings of data from the command line (that is, look for the data in the "args" array of strings). Use a loop to convert each of the strings in the array into a double and add the number to a total. Print the total after all of the strings have been processed.

The program will use try-catch to catch any error that occurs. If an error occurs, the program will print a message saying that the error occurred. The program can end at that point.

You should create the Java program using the nano editor. The input data should be a list of numbers on the line that runs the program.

The problem so far is that I keep getting an error when converting a String value into a new double value. I have yet to code the try-catch method in my program

Java Code:

import java.util.*;
public class Program13Strings {
public static void main(String[] args) {
Scanner scan = new Scanner (System.in);
System.out.println("How many lines of data do you wish to enter?");
int size = scan.nextInt();

[Code] ....

*NOTE: right where my code says double newDouble = Double.valueOf(newResponse); is where the error is occurring.

*ERROR: Exception in thread "main" java.lang.NumberFormatException: For input string: "abc"

at sun.misc.FloatingDecimal.readJavaFormatString(Floa tingDecimal.java:1241)
at java.lang.Double.valueOf(Double.java:504)
at program13strings.Program13Strings.main(Program13St rings.java:21)

Java Result: 1

How can this be fixed so I don't get this error?

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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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Splitting A String Which Is Double Hours Method

May 13, 2014

I am really struggling to make the Split String method work with another method which is double hours.

HtmlElement span = new HtmlElement(SPAN_OPEN, SPAN_CLOSE);
span.setValue("Drive Time: ");
td.addNestedElement(span);
HtmlElement span2 = new HtmlElement(SPAN_OPEN, SPAN_CLOSE);
span2.addAttribute("class", "drive_time");
String time=String.valueOf(showSet.getTransferHours());
/*Split the Strings into Hours and Minutes*/

[code]...

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Incompatible Types - String Cannot Be Converted To Double

Nov 23, 2014

import java.lang.Math;
import static java.lang.Math.random;
import java.util.Scanner;
public class LineofCoordinates
{
public static void main( String[] args, String x, String random, String exit, String y, String y2, String x2)

[Code] ....

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String Literal Is Not Properly Closed By Double Quote

Apr 28, 2014

I am working with java project which is kind of charting room..but the problem is when am writing the query for listing the message in the conversation the error prevail in my eclipse...string literal is not properly closed by double quote...this is my java file

<%
String uname=session.getAttribute("username").toString();
String pword=session.getAttribute("password").toString();
java.util.Date dat=new Date();
int x=1;
try{

[code]....

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String Literal Is Not Properly Closed By A Double Quote

Jul 11, 2014

string literal is not properly closed by a double quote

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Decimal Format Errors - String Cannot Be Converted To Double

Jun 19, 2014

I am working on a project that just calculates simple interest based upon a principal and a percent interest rate written as .xxxx from user.

I need the Loan amount and the final interest calculation to show up as a currency with commas in appropriate areas, the Rate to be expressed as X.xxx% instead of .xxxx

I keep getting this error when I compile:

C:JavaInterestCalculator.java:46: error: incompatible types: String cannot be converted to double
principal = formatter.format(principal);
^
C:JavaInterestCalculator.java:49: error: incompatible types: String cannot be converted to double
rate = formatter.format(rate);
^
C:JavaInterestCalculator.java:52: error: incompatible types: String cannot be converted to double
totalInterest = formatter.format(totalInterest);
^
3 errors

Tool completed with exit code 1

And here is my code

import java.util.Scanner;
import java.text.NumberFormat;
import java.text.DecimalFormat;
// class declaration
public class InterestCalculator
{
// main method declaration

[Code] .....

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Replace All Command That Is Found On String Between 2 Double Quotes?

Mar 17, 2014

how to replace all the command that is found on a string between 2 double quotes? for example I have a text file that contains data like as following
 
A,"-16,12","-178,245","-15,506"
B,"-16,12","-178,245","-15,506"
C,0, 0,1
 
I need an output like this:
 
A,"-16.12","-178.245","-15.506"
B,"-16.12","-178.245","-15.506"
C,0, 0,1
 
I did this but without regular expression. It seems to me that a regular expression it's more elegant than to parse every line and replace it.

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How To Escape unwanted Special Characters In String Data While Converting Into XML Data

Mar 7, 2014

I'am trying to converting string data into xml data using xml beans and StringEscapeUtils.This is work fine but in one case it if the data contains special characters.
  
Code snippet
--------------------
import org.apache.commons.lang3.StringEscapeUtils;
import org.apache.xmlbeans.XmlException;
import org.apache.xmlbeans.XmlObject;
public class ParseXMLData { 
    public static XmlObject parseXML(String stringXML) {
        XmlObject xmlObject = null;

[Code] ....
 
success case
---------------------------
i/p------<aaa><bbb>This converts string to xml</bbb></aaa>
o/p---<aaa><bbb>This converts string to xml</bbb></aaa>
 
Failer case
-----------------
i/p----<aaa><bbb>This fails if it contains < symbols</bbb></aaa>
expected o/p----<aaa><bbb>This fails if it contains < symbols</bbb></aaa>
 
Observed that it converts < to '<' but  as per xml rules, if data contains '< ' it fails. I want to convert staring and end tags to xml format and if data in b/w middle of starting and ending tags do'n need to convert it. How to do it.

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Jul 8, 2014

I am trying to make a program that calculates the change due in dollars and cents. The user inputs both the amount due and the amount tendered. My program only works with whole numbers?

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Jan 27, 2015

This program accepts Student ID numbers, Name, and grade point average. The problem I am having is with the if else statement that compares id to studentID[x]. I have tried to compare using if(id.equals(studentID[x])) and also I have tried using if(id == (studentID[x])) as shown in the code below. I keep getting incorrect results though.

//FILE: StudentIDArray.java 
import javax.swing.*; //Used for the JOption dialog boxes
import java.util.*; //Used for Scanner input

[Code]....

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Feb 3, 2015

A group of my classmates and I were discussing strings. We were asked, "What circumstances would you want to convert a text string to numerical data?" but we couldn't think of any answers outside of counting characters within the string for various applications.

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Mar 23, 2015

I'm just trying to append new employee information to a previously created file. When I type yes to add new employee and enter a string, the data does not appear in the file.

Java Code:

public class Records {
public static void main(String [] args) throws IOException {
Scanner input = new Scanner(System.in);
FileWriter fw = new FileWriter("dbs3.java", true);
BufferedWriter bw = new BufferedWriter(fw);
PrintWriter pw = new PrintWriter(bw);

[code]....

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Feb 24, 2015

I have table data I'm trying to read . However one column is populated with the word "null". I guess java does not like dealing with the word null and throws errors.
 
When I try a block like : if ( rsrow.getString(insCol) = "null") {

I get and error .
 
If I try :
 
cmp = rsrow.getString(insCol);If I try:If I try:
if (cmp = "null") {

I get an error
 
If I try to use a replace function like:
 
System.out.println(cmp.replace("null", "0"));

Just to see if replace works I get and error.
 
What is the BEST way to replace this string value with something like "0"  when I come across it with out jave throwing an error? I want it such that every time I come across the word "null" I can repalce it with "0".
 
Something like:
 
if (rsrow.getString(insCol) = "null") {rowofdata = rowofdata + "'0',";  } else {rowofdata = rowofdata + "'" + rsrow.getString(insCol) + "',";} 

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