How To Run Two Methods At The Same Time

Jun 22, 2014

Below is the main class of a project ive been working on, the goal is to start a countdown specified by the user. When the countdown reaches zero the base drops in the song that is being played. (Its not done yet) The main problem that arises is the fact that my song plays, and AFTER that, the timer starts.

Output:

Please input countdown in HH:mm:ss format.
00:00:41
Start?
Yes

The name of of the song is: Skrillex & Damian "Jr Gong" Marley - "Make It Bun Dem"

The time of base drop is: 00:00:41 //Song starts here

//Song is done
//Then timer starts
00:00:41
00:00:40
00:00:39

[code].....

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Unable To Call / Test All Of The 5 Sorting Methods At Same Time In Main Class

Dec 19, 2014

For reference I am programming Java in BlueJ. I am fairly new to the language and I am having trouble with sorting.

I am trying to call / test all of the 5 sorting methods (at the same time) in the main class. To be specific, the sorted list has to technically outputted 5 times.

I figured out how to call / test Quicksort:

Sorting.quickSort(friends, 0, friends.length-1);

But the others are not working correctly. Specifically these:

Sorting.mergeSort(friends, 0, friends.length-1);
Sorting.PbubbleSort(friends, 0, friends.length-1);
Sorting.PinsertionSort(friends, 0, friends.length-1);
Sorting.selectionSort(friends, 0, friends.length-1);

For reference, this is the output when it is not sorted:

Smith, John 610-555-7384
Barnes, Sarah215-555-3827
Riley, Mark 733-555-2969
Getz, Laura 663-555-3984
Smith, Larry464-555-3489
Phelps, Frank322-555-2284
Grant, Marsha243-555-2837

This is the output when it is sorted:

Barnes, Sarah215-555-3827
Getz, Laura 663-555-3984
Grant, Marsha243-555-2837
Phelps, Frank322-555-2284
Riley, Mark 733-555-2969
Smith, John 610-555-7384
Smith, Larry464-555-3489

This is the class Sorting, which I should note is all correct:

public class Sorting{
/**
* Swaps to elements in an array. Used by various sorting algorithms.
*
* @param data the array in which the elements are swapped
* @param index1 the index of the first element to be swapped
* @param index2 the index of the second element to be swapped
*/
private static <T extends Comparable<? super T>> void swap(T[] data,
int index1, int index2){
T temp = data[index1];
data[index1] = data[index2];

[Code]...

This is the Main class in which I am supposed to call the sorting methods, SortPhoneList:

public class SortPhoneList{
/**
* Creates an array of Contact objects, sorts them, then prints
* them.
*/
public static void main (String[] args){
Contact[] friends = new Contact[7];
friends[0] = new Contact ("John", "Smith", "610-555-7384");
friends[1] = new Contact ("Sarah", "Barnes", "215-555-3827");

[Code]...

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Military Time - Adding Minutes Displaying Correct Time

Feb 9, 2015

I am working on an assignment that I can't seem to figure out the final part to. The program takes in course data such as the time the class starts and how long it lasts. The time is in military time (0000 - 2400)

I need the output time to be the time the class started, plus the length of the class, and displayed in military time.

for example,

Start Time = 0930
Length = 50 minutes
Endtime = 1020

I can't for the life of me figure out how to do this. I have gotten a program that works for this time and minutes, and displays the correct 1020. But when I change the information to say

Start time: 0700
Length = 90 minutes

I get:

Endtime = 90

90 is technically correct, the way the formula is setup, but I need it to display 0900 not 90.

Here is the code that I have. Be easy, I'm still learning, and this is just the file I created to get the formula to work. Also, the verbose in here is just for my own debugging to make sure values should be what I'm expecting them to be.

public class calc
{
public static void main(String[] args) {
double hours, minutes, length;
double temp;
int time = 2400;
hours = time / 100;
System.out.println("Hours are: " + hours);

[Code] ....

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Converting Military Time To Standard Time?

Jan 29, 2014

I have two classes. time_runner is used for testing my code.

This is what I'm using to test my code:
 
class time_runner
{
 public static void main(String str[]) throws IOException {
 Time time1 = new Time(14, 56);
System.out.println("time1: " + time1);
System.out.println("convert time1 to standard time: " + time1.convert());
System.out.println("time1: " + time1);
System.out.print("increment time1 five times: ");
time1.increment();

[code]....

The two constructors are "Time()", which is the default constructor that sets the time to 1200, and "Time(int h, int m)" Which says If h is between 1 and 23 inclusive, set the hour to h. Otherwise, set the hour to 0. If m is between 0 and 59 inclusive, set the minutes to m. Otherwise, set the minutes to 0. Those are my two constructors that I pretty much have down. The three methods however I'm having trouble with. The "String toString()" Returns the time as a String of length 4. The "String convert()" Returns the time as a String converted from military time to standard time. The "void increment()" Advances the time by one minute.

public class Time {
private int hour;
private int minute;
  public Time(int h, int m) {
if(h > 1 && h < 23)
hour = h;

[code]....

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How To Set Time For Calendar

Mar 7, 2014

I would like to set a specific time for a Calendar instance. My below code will set a time one minute ahead of the current time, and format it to ISO8601 standard.

Java Code:

Calendar reminderDate = Calendar.getInstance();
System.out.println(dateFormat.format(reminderDate.getTime()));
reminderDate.add(Calendar.MINUTE,1);
SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
String finalReminderDate = sdf1.format(reminderDate.getTime()); mh_sh_highlight_all('java');

I now want to set another variable(deadlineDate), but to a specific time, say 5 minutes ahead. I would like to hardcode this in so I dont want it to change as a result of getting the instance of the Calendar(which sets it to the current time)

Essentially I am trying to regenerate the above code every minute and increment itself each cycle until it reaches the deadlineDate, which is a fixed datetime.

How can I do this?

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How To Iterate Two Lists At A Time

Mar 25, 2015

List list1 = query1.list();
List list2 = query2.list();
 
for (Iterator itr = list1.iterator(); itr.hasNext();) {
Object[] row = (Object[]) itr.next();
}

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Going Through All The Keys On Keyboard One At A Time

Jul 14, 2014

I am writing a code that tries to figure out the users password by going through every possible key (brute force). Although I think its going to work, it looks EXTREMELY inefficient to me, since its just a huge switch statement for each character -- 94 total, including the shift values. Is there a built in method in the JAVA API that goes through every key or something?

Here is my code for that segment:

public char[] HackingPassword(){
char[] passChars = this.password.toCharArray();//convert the password to char[]
char[] hacking = new char[passChars.length];//make the hacking variable same size as users password
int nextCharValue = 0;//this is used to cycle through the keyboard
//check each letter of hacking to match with password
for(int i = 0; i < passChars.length; i++){

[Code] .....

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How To Reduce Time In Java

Jul 3, 2014

I have two string representations of time in "HH:MM:SS" and I want to minus one time from the other.

For example if a = 10:20:30 and b = 00:50:20, i would get 09:30:10. What is the best way to do this?

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JPanel Is Not Displaying All The Time

Jul 2, 2014

Yes my JPanel is not displaying all the time like you would think it would. Before you beat me up yes I am a bit new I am just working on the GUI part of java over my summer break. Obviously it is not suppose to do that. Secondly, As you can see i am using the alphabet to create JButtons. Shouldnt there be an easier way to use a for( loop) . I tried before but I didn't want to get too side tracked.

Java Code:

import javax.swing.*;
import java.awt.*;
public class hello {
private JFrame alphaframe1;
private JFrame alphaframe2;

[Code] .....

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String To Calendar Time

Feb 9, 2014

I'm having an issue with this little bit of conversion. I'm converting a string (_dateString) into a Calendar time. I am using DateFormat and SimpleDateFormat to accomplish this task. Everything seems to be working great, except for it figuring out whether it is AM or PM. According to SimpleDateFormat (Java Platform SE 7 ) I am using "aa" to get my AM or PM marker. How come in my output then, it believes it to be 4:45 am instead of 4:45 pm? Hour of Day should return the 24 hour clock, which should show 16 instead of 4. I have posted the output below my code.

Java Code:

import java.text.*;
import java.util.*;
public class Time{
static String _dateString = "08 Feb 2014, 4:45pm";
public static void main(String args[]){
Calendar cal=Calendar.getInstance();

[Code] ....

Output:

Java Code:

Today is Sat Feb 08 04:45:00 EST 2014
Year: 2014
Month: 1
Day of Month: 8
Day of Week: 7
Week Of Year: 6
Week of Month: 2
Hour: 4
Hour of Day: 4
Minute: 45
Second: 0
Millisecond: 0 mh_sh_highlight_all('java');

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Getting User Input Second Time

Apr 19, 2014

I'm working on creating a dice game and getting the users input is giving me a really hard time. I have the main game working but this part I'm stuck on. The problem is that it's not giving me the chance to enter the second input when I ask for the game.

//Create Scanner object
Scanner keys = new Scanner(System.in);
//Get chips
System.out.print("How much money would you like to change? ");
int chips = keys.nextInt();
System.out.println("You now have $" + chips + " in chips.");

[code]...

This is what I get when I run it run/How much money would you like to change?

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Java Addition Of Time

Jun 28, 2014

I work as a golf staff I would like to create application which would tell me the playing time and the time when players need to reach certain playing field/hole. my ideas is to make a program which would ask the user to input their starting time and than select the hole number, where the end result would be amount of actuall time.

I have been having hard time to figure out howe to properly structure the input conversion so it is recognized as a time (Exampke: 10:15). Do I need to use the calendar method in Java or ?

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How To Get Time Shown In JFrame

Aug 8, 2014

I am trying to to insert time onto my jFrame (Netbeans) by using textfields. this is the code i've tried to put into the textfield so whenever i run the program it automatically shows the time.

Calendar now = Calendar.getInstance();
hours = now.get(Calendar.HOUR);
minutes = now.get(Calendar.MINUTE);
seconds = now.get(Calendar.SECOND);
millis = now.get(Calendar.MILLISECOND);

[Code] ....

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One Time Password Generation

Jan 21, 2014

I Have one query regarding OTP, In my project while registration the otp should be generate and send to the mobile number of user which is registered the form.

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Print Current Time Every Second?

Nov 13, 2014

I need to write a program that prints the current time every second. Here is what I have and I am not entirely sure why I'm not.

Java Code:

import java.util.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Timer;
public class CurrentTime

[Code] .....

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How To Find The Best Time Of 14 Run Times

Oct 19, 2014

I have this code that prints the run time for each for loop iteration but how do I find the fastest time store it in a variable and the print that variable at the end? This is what I have currently.

for (int i = 1; i <= 14; i++) {
int n = (int) Math.pow(2, i);
int[] list = new int[n];
for (int j = 0; j < list.length; j++) {
list[j] = (int) (Math.random() * 2000);
}
int length = list.length;
double radixTime = radixSort(list, length);
System.out.println("For base " + i + " the time was " + radixTime);
}

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Get Current Utc Date / Time?

Jun 2, 2014

I am trying to get the current utc date/time, but it keeps printing out in local time:

Java Code: LocalDateTime dt = LocalDateTime.now();
ZonedDateTime zdt = dt.atZone(ZoneOffset.UTC);
System.out.println("time: " + zdt);
// output:
time: 2014-06-02T13:37:55.705Z mh_sh_highlight_all('java');
13:37 is local time. Utc time is 17:37.

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Time Input Validation

Nov 24, 2014

I am trying to validate user input of time. It seems that only part of it works. It will only accept hour 20-23 as valid.

void timeValidate() {
String value = "";
boolean bTryAgain = true;
Scanner sc = new Scanner(System.in);

[Code] .....

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LocalDateTime Class And UTC Time

Jun 8, 2014

Does LocalDateTime.now() return the date in UTC time or local time?When I check with:

System.out.println("current time: " + LocalDateTime.now());

It gives local time. However, I am not sure if it is the toString() method of LocalDateTime that converts it to local time, or if it indeed returns time in local time. I need to save data to database in utc time, and I would like to know if LocalDateTime can give utc time.

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How To Get System Time In Java

Jun 1, 2014

I just want to calculate search time for my algorithm . How to get system time in java other than System.nanotime() and System.currenttimemillis() as these methods does not returns consistent time for same input is their another option to get system time???

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Joda Time Threading

Nov 20, 2014

I have an application that uses multiple threads to access logic. I am using joda time to compare dates because joda time is thread safe. Below is the example method I am using. My question is being that joda time is thread safe, does it matter whether or not I am using a static method rather than an instance method?

Java Code:

public static boolean isDateEqual(Date checkedDate, String targetDateString) {
boolean passed = false;
if (checkedDate != null && targetDateString != null && !targetDateString.equals("")) {
DateTime checkedDateTime = new DateTime(checkedDate);
DateTimeFormatter fmt = DateTimeFormat.forPattern("MM/dd/yyyy");
DateTime targetDateTime = fmt.parseDateTime(targetDateString);
if (DateTimeComparator.getDateOnlyInstance().compare(checkedDateTime, targetDateTime) == 0) {
passed = true;
}
}
return passed;
} mh_sh_highlight_all('java');

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Time Management System

Oct 27, 2014

I'm in the middle of building A time management system for myself.I'm currently using JodaTime for timing in java. I just can't figure out who to save my data like, the starttime, stoptime and day time.

public void save() throws SQLException {
String checkSql = "select count(*) as count from Time where id=?";
PreparedStatement checkStmt = con.prepareStatement(checkSql);
String insertSql = "insert into Time (id, day, starttime, stoptime, overtime, exception, hours) values (?, ?, ?, ?, ?, ?, ?)";
PreparedStatement insertStatement = con.prepareStatement(insertSql);

String updateSql = "update Time set day=?, starttime=?, stoptime=?, overtime=?, exception=?, hours=? where id=?";
PreparedStatement updateStatement = con.prepareStatement(updateSql);

[code]....

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Incrementing Count By 1 Each Time

May 25, 2014

I am currently take a class, and trying to increment the count of employees I enter into an ArrayList by 1 for every entry. However, instead of incrementing by 1 each time, the current number of employeeIDs adds itself to itself, then adds 1, giving a non-sequential number (i.e. an employeeID of 75 will add itself to 75 + 1 to get a new employeeID of 151).

The following code is what I have done in terms of incrementing. (More coding has been done, but it is not used to increment, so I have omitted it.

public class Employee
{
// instance variables
private String firstName;
private String lastName;
private int employeeID;
static int newEmployeeID = 0;

[Code] ....

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What Is A Compile Time Constant

Jul 16, 2009

"Because X is a compile time constant, the compiler will Y"... But what exactly is a compile time constant? And how can we determine whether something is treated as such?Obviously, a compile time constant is a constant value that is known at compile time... ... Literals are, by definition, compile time constants -- as they are constants, known at compile time.

But the definition of a compile time constant is a bit more complex. To start, let's examine section 15.28 of the Java language specification.A compile-time constant expression is an expression denoting a value of primitive type or a String that is composed using only the following:

Literals of primitive type and literals of type String Casts to primitive types and casts to type StringThe unary operators +, -, ~, and ! (but not ++ or --)The multiplicative operators *, /, and %The additive operators + and - The shift operators <<, >>, and >>>The relational operators <, <=, >, and >= (but not instanceof)The equality operators == and !=The bitwise and logical operators &, ^, and |The conditional-and operator && and the conditional-or operator ||The ternary conditional operator ? : Simple names that refer to final variables whose initializers are constant expressions Qualified names of the form TypeName . Identifier that refer to final variables whose initializers are constant expressions

This is the full definition of a compile time constant. And as you can see, it contains more than just literals. In fact, literals are merely the first bullet point on the list. Also, note that a compile time constant can apply to any literal that is of primative or String type.The next few bullet points are the operations that can be applied to a constant at compile time. This list is actually pretty long, as it is possible to apply most of the operations at compile time. It may actually be easier to remember what can't be apply at compile time -- pre and post increment and decrement, instanceof operator, or any method calls, are not on the list.

The last few bullets are the most interesting. It is possible to use a variable in the expression -- provided that the variable is a compile time constant variable. So... what is a constant variable? Going back to the JLS (section 4.12.4 to be exact)..4.12.4 final Variables.A variable can be declared final. A final variable may only be assigned to once. It is a compile time error if a final variable is assigned to unless it is definitely unassigned (§16) immediately prior to the assignment.

We call a variable, of primitive type or type String, that is final and initialized with a compile-time constant expression (§15.28) a constant variable. Whether a variable is a constant variable or not may have implications with respect to class initialization (§12.4.1), binary compatibility (§13.1, §13.4.9) and definite assignment (§16).The last part of the definition is the relevant part (I still find it amazing that this is that well hidden in the specification). To be a variable that is a compile time constant, the variable needs to be...declared as finalhave a primative or String typeinitialized (on the same line as the declaration)assigned to a compile time constant expression.

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Aug 12, 2014

So recently I began Data Structures as core subject and the tutorials in this forum are great.

Right now, I seem to have trouble with Big Oh Notation algorithm and what is the mathematical side to it. "f(n) <= c.g(n), for n>=0.

The question I am working on is: Suppose we are maintaining a collection C of elements such that, each time we add a new element to the collection, we copy the contents of C into a new array list of just the right size. What is the running time of adding n elements to an initially empty collection C in this case?

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Sep 25, 2014

So I am making a program that will allow programs only at a certain time and i'm not sure how I would set the time for the program.

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