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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Jan 31, 2011
What is the difference between float and double?
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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Jun 30, 2014
I'm supposed to write a program, which reads float numbers from a file, puts them in an array and sorts the array. After that I'm suppose to add the numbers so that when I add the 1 and 2 number of the array, I'm suppose to save the sum on the position of number 1, then I add number 3 and 4 and save the sum on position 2 etc. Also if my array has an uneven number of floats it's suppose to add the last 3 and not 2 numbers in the last iteration. The problem is the method throws an ArrayOutOfBounds Exception but I can't seem to find my mistake.
That's the second method. The first one just stores the sum in another variable and then returns it. Also is there a way in that I can Scanner/File/array etc. and initialize the array only once so I don't write the same code two times like it is now.
package sumOfFloats;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Arrays;
import java.util.Scanner;
public class SumOfFloats {
public static float sumFloats() throws FileNotFoundException{
[Code[ ....
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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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Aug 9, 2014
Here is a code and error .....
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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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Feb 8, 2015
Write a java program to accept a string, float and an integer as command line arguments. String value should be displayed. Also the program should display the maximum value of two numbers. Use Integer.parseInt() and Float.parseFloat()
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Nov 2, 2014
The LocalStudent class inherits the Student class. The IDE states an error of "no default constructor in Student class".I understand that if a LocalStudent object is created, the default constructor of its superclass (aka Student class) will be called implicitly.there is no LocalStudent object being created, so why is the default constructor of Student being called ?
The default constructor of LocalStudent is also overloaded by the created no-arg constructor containining subjects = null; . So there is no call to the superclass default constructor from the default constructor of LocalStudent.
public class Student {
private char year1;
public Student(String name, char year){
year1 = year;
}
public char getYear(){
return year1;
[code]...
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Mar 28, 2015
I am new in java. Is there any difference between protected or default when we are talking about one package?
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Mar 31, 2014
what is default literal for Boolean data type?
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Oct 8, 2014
ArrayList l = new ArrayList();
System.out.println(l.size());
When I running the above code in eclipse the console show me the result as "0". So how to rectify this code to find default size as 10.
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Feb 7, 2014
interface I1{
void show();
void display();
default void put(){
System.out.println("I am from interface I1");
[Code] ....
This code is not working..
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