Difference Between Big Decimal And Float / Double And Benefits

May 28, 2014

I've recently came into reading that term big decimal, but I still don't fully understand what the benefit it is or why wouldn't you just use double and say have the program stop after a certain range?

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What Is Difference Between Float And Double

Jan 31, 2011

What is the difference between float and double?

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Scanner Class Error For Decimal Values (double / Float)

Apr 23, 2014

I'm not getting why my program is giving error.

package rockjava;
import java.text.NumberFormat;
import java.util.Scanner;
public class file4 {
public static void main(String[] args)

[Code] ....

Please Input Num of Pods + Num of Keys= 20.5
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextFloat(Unknown Source)
at alijava.file4.main(file4.java:14)

(It is not accepting double values. However working fine for integers.)

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Converting From A Vector Containing Big Decimal To A Float

Mar 13, 2015

I'm having extreme difficulty in working with a Vector storing a column with a BigDecimal value, and converting that single value into a float. I'm not sure why the code was written this way, but basically, I'm working with something called a vector that has a single Big Decimal value/column (not sure what the correct terminology is), and I want to store that value in a float variable called "dp". However, I don't know how to convert from the Big Decimal to a float.

Code is below:

String s = "";
sql = "SELECT DiscountPercentRate FROM Attendees WHERE AttendeeId=" + attendeeId;
  Vector v2 = sqldb.getResults(sql); /*I know that sqldb.getResults(sql) returns a vector with a single BigDecimal column of 15.0, in the test example I'm using*/
if (!v2.isEmpty()) {
Vector data2 = (Vector)v2.elementAt(0);
if (!data2.isEmpty())

[Code] .....

In case you're wondering what the sqldb.getResults() method looks, like, here's a snippet of it - There's an else statement that triggers in my case, adding a BigDecimal column to a vector, and returns that vector.

Vector v = new Vector();
...
else {
BigDecimal bd = rs.getBigDecimal(i);
vCols.add(bd);
}
v.add(vCols);
...
return v;

How can I take the single result of my SQL query in that Vector/Big Decimal thing, and turn that result into a float value?

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Java API - Truncate Float Part Of Double Variable

Jan 13, 2015

Is there a method in Java API that truncate the float part of a double variable after a given number of digits?

Example: if the number of digits to be truncated is 2, so the method truncate (6.9872) to (6.98) ,

I tried to write a method that do that but it was very difficult.

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Compilation Error Type Mismatch - Cannot Convert From Double To Float

Apr 20, 2014

I have a simple doubt

float k = 0;
k+=0.2;
k=k+0.2; // here compilation error

compliation error Type mismatch: cannot convert from double to float

My question is why not a complilation error at k+=0.2;

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Converting Double Value To A 2 Decimal Place Value

Jan 28, 2015

I am trying to convert the double grossPay to 2 decimal places but cannot get it to work ,I am unsure of the correct way of doing this but this is how far I can get

public static double grossPay(double Orate, double overtime, double salary) {
double grosspay = 0;
grosspay = (Orate * overtime) + (salary / 26);
DecimalFormat df = new DecimalFormat("#.##");
return(df.format(grosspay));
}//closes grossPay method

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How To Print Double With 2 Decimal Numbers

May 3, 2014

I am trying to cast an integer into a double. it works but I need two decimal number after the dot and for example I can print 7.51 but how can I get it to print 7.50 and not 7.5

public int compareTo(Money o){
int d1 = (this.dollars * 100) + this.cents;
int d2 = (o.dollars * 100) + o.cents;
return d1 - d2;
}

On my main method I have

public static void main(String[] args){
Money money1 = new Money(10, 49);
Money money2 = new Money(2, 99);
System.out.println("result: " + "$" + (double)money1.compareTo(money2)/100);
}

It prints 7.5 but I want it to print 7.50, how do I do this .....

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Unable To Get Value Out Of Double - It Only Extends To One Decimal Place

Oct 3, 2014

I'm not sure why, but whenever I try to get a value out of a double, it only extends to one decimal place. For instance, (825 / 805) would become 1.0000 (after being run through a DecimalFormat object) instead of 1.0248 like I need it to be (and should be if what I know about primitive variable types is right). Why is the double variable type not giving me the precision I want and, more importantly, how do I fix this?

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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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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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Not Getting Decimal For Surely Decimal Answer?

Jan 1, 2015

I'm using eclipse. I'm going to get straight to the point and give all the info I can, if the values in the first code box are used, shouldn't these values be left after all in the second box is done:

remainder=23, arr[0]=100, div=23/10=2.3, whole=2, and decimal=3?

When I use this code, div comes out to be just (2.0).

Java Code:

int leng=10;
arr[0]=123; //int
arr[1]=100; //int mh_sh_highlight_all('java'); Java Code: if (arr[0]!=arr[1]){
int remainder=arr[0]-arr[1];
arr[0]=arr[0]-remainder;
double div=remainder/leng; //double div=Double.valueOf(remainder/leng);
int whole=(int) Math.floor(div);
int decimal=(int) ((div-whole)*leng); mh_sh_highlight_all('java');

I'm not sure were I'm going wrong in how div is being calculated, but I ultimately need div to be 2.3.

I've also used the second option commented out which still gives (2.0).

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Round Decimal Number Into 2 Decimal

Apr 2, 2014

Here is my code and i want to convert number into 2 decimal but this code not give me result how to check my code.

import javax.swing.JOptionPane;
public class showtime{
public static void main(String[] args){
double total_mili=System.currentTimeMillis();
JOptionPane.showMessageDialog(null,total_mili, "Total milisecond",JOptionPane.INFORMATION_MESSAGE);
double seconds=total_mili/60;
double sec=(double)(seconds * 100) / 100.000;
JOptionPane.showMessageDialog(null,seconds, "Total Second",JOptionPane.INFORMATION_MESSAGE);
JOptionPane.showMessageDialog(null,sec, "Total Second",JOptionPane.ERROR_MESSAGE);
}
}

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What Are Benefits Of Using Interface Plus Abstract Class Over Just Abstract Class

Oct 8, 2014

What are the benefits of using an Interface plus an abstract class, over just an abstract class?

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How To Put Default Int / Float For JTextField

Feb 4, 2014

Will I'm tying in my code to set a default number for the JTextField that when the user decide not to put any numbers. Like let say that I want the textfield set to 0 , so then the user do not file it it won't make any problem to the program because its already has a default number.

if (stringGQ != null && stringGW != null && stringGP != null){
 stringGQ = gMQ.getText();
stringGW = gMW.getText();
stringGP = gMP.getText(); 
weightPrice_1M = Double.parseDouble(stringGW) * Double.parseDouble(stringGP);

[Code] .....

Note: This is a small part of my code. when I leave it empty it take the 0 as a value, However, when I write in text field it also take the value of a 0 and the finalTotal is also = to 0.what I'm doing wrong.

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Blank Value In Float Array?

May 11, 2015

I am getting the blank value in the array and this code is passed in IVR for playing the values since the first value is blank the prompts arrangements is disturbed. I want to replace the blank space or value by zero.

I have pasted the log and below is the code.

DEBUG - 7053CFEF4819D884638A42F088B507C3:/EntryPoint_1000 : session id:IVREPMSUAT2-2015083130037-4 |
Comm_DBinteraction-trcITELOutput | V_COUNTERTYPE:: | v_counterType : 1,2,3,4,5,6,7,8,9,10
DEBUG - 7053CFEF4819D884638A42F088B507C3:/EntryPoint_1000 : session id:IVREPMSUAT2-2015083130037-4 | Consult_IVR_3000:Comm_DBinteraction-trcITELOutput | V_SPENDINGLIMIT:: | v_spendingLimit :,500.0,59.5,0.0,1101.0,581.5,393.0,0.0,0.0,0.0

[code]....

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Show Max And Min Value Of Float Integer

Feb 20, 2014

How do I write a program that shows the max and the min value of a float integer? I found out that in order to get the long I just type in

System.out.println(Integer.MAX_VALUE); and System.out.println(Integer.MIN_VALUE);

I don't know how to do it to a float integer.

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Assign Float Value To Int Variable

Feb 24, 2015

//Output is:ERROR.. one of the books says, we can assign float value to int variable, but its giving error.

class floint
{
public static void main(String arg[])
{
int i;
float j=10.12f;
i=j;
System.out.println(i);
}
}

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Showing Min And Max Value Of Float Integer?

Feb 20, 2014

How do I write a program that shows the max and the min value of a float integer? like for example in order to get the max value of a long integer we type System.out.println(Integer.MAX_VALUE); How would I do that for a float integer?

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Changing Precision Of A Float?

Jan 26, 2014

Ok, so in my quest to achive perfect ray casting and line/plane intersection, what I believe to be my last problem is precision of a float. I need some precision (0.000) but I am dealing with the difference of (-1.000000000) and (-1.000000002), where the second number would be completely off. I looked at DecimalFormat, but that just puts it into a string, I need actual loss of precision.

Java Code:

DecimalFormat form = new DecimalFormat("0.00");
String newX = form.format(x);
String newY = form.format(y);
String newZ = form.format(z);
x = Float.parseFloat(newX);
y = Float.parseFloat(newY);
z = Float.parseFloat(newZ); mh_sh_highlight_all('java');

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Binary Search Of Float Array?

Mar 25, 2014

Doing an early exercise out of the Java Examples in a Nutshell book and they are asking for 'an efficient search algorithm to find the desired position' of two floats in a sorted array that bound an int. My try is below:

public static int search(int searchnum, float[] nums){
int low = 0;
int high = nums.length - 1;
int mid = (low + high) / 2;
while(low < high){
if(nums[mid] < searchnum){

[Code] ....

This is working for the example but I would like to know if it is considered 'efficient' or even good?

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Writing Float Array To File

Apr 20, 2014

I am trying to write a Float Array to a file but it is only writing the last line of the array to a file. I have also attached the entire assignment as a zip file with all required files. Here is the part of the code I am having issues with:

Java Code:

for (int i = 0; i < differenceArray.length; i++){
System.out.println ("Date: "+ dateArray[i] + " Opening: " + dataArray[i][2] + " Closing: "+ dataArray[i][5] + " Difference: " + differenceArray[i]);
try(FileWriter writer = new FileWriter("C: emp" + fileName + ".txt")){
writer.write(Float.toString(differenceArray[i]));

[Code] .....

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Multiplying Two Strings - Float Values

Jul 1, 2014

I am currently learning about JOption pane. Using Strings I am accepting an input from the user and by using the Interer.ParseInt(variable) option I am able to multiply this two strings using the code below.

String Length;
Length = JOptionPane.showInputDialog("Enter the Length");
String Breadth;
Breadth = JOptionPane.showInputDialog("Enter the Breadth");
System.out.println(" Area is " + (Integer.parseInt(Breadth) * Integer.parseInt(Length)));
System.exit(0);

Now My question is... How Do I make my code accept Decimal values. E.g. My Code should accept 10.02 as Length and 20.42 as Breadth and give the product a Decimal. How Do I do this???

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Error - Invalid Float Literal

Apr 26, 2014

While doing trial and error got caught in the below scenario.

public class Crypt {
public static void main (String args[])
{
/*all I want is calculate a binary number (ex -: 22 , 34) using decimal base (10n).
*So, I have to convert 2 p into 10n form so I have to find n in terms of p . We have x as the input.
* The formula works as below.
*2p =10n
*p ln (2) =n ln (10)
*n = p [ln(2) / ln(10)]
*2 p = 10 p [ln(2) / ln(10)]

[Code] ....

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Converting The Output Of Table To Float Point Value

Apr 26, 2015

I created this program to display a square root table. Problem is all of my output is too long. I would like to round the number to 4 spaces past the decimal. Here is my code:

public class MySqrt5_2 {

public static void main(String[] args) {
System.out.println("Number SquareRoot");
int[] table;
table = new int[21];
for (int counter = 0; counter < table.length; counter += 2) {
System.out.println(counter + " " + Math.sqrt(counter));
}
}

}

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JavaFX 2.0 :: Float Modeless Popup On Top Of All Other Content

Jun 1, 2014

I have a case where I want to float a modeless popup on top of all other content. Seems like a Popup is ideal for this. Except for the following annoyances:
 
I don't see any way to tie its position to some owner window. You can supply an initial anchor position, but I noticed that if I drag the frame of the app window containing the JavaFX application, the Popup remains where it is and can actually appear outside the bounds of the App! I find this very disconcerting. I suppose I could bind its position to the screen coords of the Stage, but it would seem that I should not have to do this.If I minimize the app, the Popup remains visible. Rather odd given that when I called Popup.show(Window), you would think when the owner Window got hidden it would hide the owned Popups too. Again, I could probably bind to some property on the Stage, but like (1), it seems you should not have to do this. 
 
I haven't tried this while embedding the Scene in a browser. I certainly hope that these Popups should not be allowed outside the bounds of the browser window. That spells trouble.

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