Apologies, as I'm sure this is a stupid question, but...
Please could anyone explain to me why this:
public class java {
public static void main(String[] args) {
byte zero = 0;
short one = 1;
int three = 3;
long one2 = 1;
float onepointnought = 1.0f;
double onedotnone = 1.0;
char letterh = 'H';
char letterw = 'w';
char letterr = 'r';
char letterd = 'd';
boolean bool = true;
String output = letterh + three + one + one2 + zero + " " + letterw + zero + letterr + one + letterd + " " + (onepointnought+onedotnone) + " " + bool;
System.out.println(output);
} }
Is outputting:
77 w0r1d 2.0 true
I'm expecting it to say "H3ll0 w0r1d 2.0 true"
It's from the interactive online java tutorials over at http://www.learnjavaonline.org/
Thanks!
Neil.
In this sentence
String output = letterh + three + one + one2 + zero + " " + letterw + zero + letterr + one + letterd + " " + (onepointnought+onedotnone) + " " + bool;
the letterh contains 'H' whose ASCII value is 72 & the addition of three + one + one2 + zero is 5 because these are non-string variables, so it is displaying (72 + 5)77 in the result,
you must convert three , one , one2 , zero to sting variable
Related
How can I format this String with double x,y,total to two decimal places. String output = (x + " + " + y + " = " + total);
String ouput = String.format("%.2f + %.2f = %.2f",x,y,total);
System.out.println(output);
will give you the output with 2 decimal places or you can use DecimalFormat as well.
Wanted to check if there is any null value in column field in the csv file and also there shouldn't be null value after / in number column, if it is null the entire row should not be written to output file.
name,number,gender,country
iva 1/001 f Antartica
aaju 2/002 m russia
lax 3/ m brazil
ana 4/004 f Thailand
vis 5/005 m
for e.g. 3rd and 5th row should not be written to output file.
using (StreamWriter file = new StreamWriter(filepathop)) {
for (int i = 0; i < csv.Length; i++) {
{
if (i == 0) {
file.WriteLine(header + "," + "num" + "," + "serial" + "," + "date");
}
else {
var newline = new StringBuilder();
string[] words = csv[i].Split(',');
string[] no = words[1].Split('/');
string number = no[0];
string serial = no[1];
newline.Append(number + "," + serial + "," + tokens[0]);
file.WriteLine(csv[i] + "," + newline);
}
}
}
}
}
}
}
You can test for null columns with string.IsNullOrEmpty(column) or column.Length == 0 like so:
if (!string.IsNullOrEmpty(serial) && !string.IsNullOrEmpty(country))
file.WriteLine(csv[i] + "," + newline);
You might want to check and remove white space, too. Depends on your input.
I am trying to write an cron expression with a specific start time and end time everyday. i.e.
every minute from 10:15 to 17:35 everyday
One possible solution for this is writing 3 different cron expressions like this:
0 15-59 10 * * *
0 * 11-17 * * *
0 0-35 17 * * *
Is there any possible way to write this in one single cron expression ?
There is no other way to achieve it using single crone expression but to specify multiple crone expressions for specific startDate and endDate.
There is a slight modification in second crone expression though (highlighted one)
0 15-59 10 * * * (Every minute between 10:15 AM and 10:59 AM)
0 * 11-16 * * * (Every minute, between 11:00 AM and 04:59 PM)
0 0-35 17 * * * (Every minute between 05:00 PM and 05:35 PM)
Quartz Scheduler c#
run job between to hours
use corn mask:
ITrigger trigger_1 = TriggerBuilder.Create()
.ForJob("YOUR_JOB")
.WithIdentity("trigger_1")
.StartAt(startTime)
.WithCronSchedule("0 0/1 8-13 ? * SUN,MON,TUE,WED,SAT *")
.Build();
use Quartz Schedule:
trigger_1 = TriggerBuilder
.Create()
.ForJob("YOUR_JOB")
.WithIdentity("trigger_1")
.StartAt(startTime)
.WithDailyTimeIntervalSchedule(c => c
.OnEveryDay()
.WithIntervalInMinutes(1).WithRepeatCount(1)
.StartingDailyAt(new TimeOfDay(08, 30))
.EndingDailyAt(new TimeOfDay(12, 30))
)
.Build();
HashMap<String, String> weekday = new HashMap<>();
// String strDays ="[Monday, Friday]";
String strCalDay = "";
String startDate[] = fromDate.split("-");
String endDate[] = toDate.split("-");
weekday.put("MONDAY", "1");
weekday.put("TUESDAY", "2");
weekday.put("WEDNESDAY", "3");
weekday.put("THURSDAY", "4");
weekday.put("FRIDAY", "5");
weekday.put("SATURDAY", "6");
weekday.put("SUNDAY", "7");
strDays = strDays.replace("[", "").replace("]", "");
String strDay[] = strDays.trim().toUpperCase().split(",");
if (strDay != null && strDay.length > 0) {
for (int i = 0; i < strDay.length; i++) {
strCalDay = strCalDay + "," + weekday.get(strDay[i].trim().replace("\"", ""));
}
// System.out.println(" No of days :: "+ strCalDay);
strCalDay = strCalDay.replaceFirst(",", "");
//System.out.println(" No of days :: "+ strCalDay);
}
Calendar startCal = Calendar.getInstance(TimeZone.getDefault());
Calendar endCal = Calendar.getInstance(TimeZone.getDefault());
startCal.set(Integer.parseInt(startDate[0].toString()),
Integer.parseInt(startDate[1].toString()),
Integer.parseInt((startDate[2].toString())));
endCal.set(Integer.parseInt(endDate[0].toString()),
Integer.parseInt(endDate[1].toString()),
Integer.parseInt((endDate[2].toString())));
int yearsInBetween = endCal.get(Calendar.YEAR) - startCal.get(Calendar.YEAR);
int monthsDiff = endCal.get(Calendar.MONTH) - startCal.get(Calendar.MONTH);
long ageInMonths = yearsInBetween * 12 + monthsDiff;
System.out.println(" ageInMonths: " + ageInMonths);
if (startCal.get(Calendar.MONTH) != endCal.get(Calendar.MONTH)) {
if (ageInMonths == 3) {
Calendar middleMonth1 = (Calendar) startCal.clone();
middleMonth1.add(Calendar.MONTH, 1);
Calendar middleMonth2 = (Calendar) startCal.clone();
middleMonth2.add(Calendar.MONTH, 2);
int getFirstMMonth = middleMonth1.get(Calendar.MONTH);
int getSecMMonth = middleMonth2.get(Calendar.MONTH);
if (getFirstMMonth == 0) {
getFirstMMonth = 12;
System.out.println(" getFirstMMonth : " + getFirstMMonth);
}
if (getSecMMonth == 0) {
getSecMMonth = 12;
// System.out.println(" getSecMMonth : " +getSecMMonth );
}
exp = strTimeMin + " " + strTime + " " + startDate[2] + "-" + "31,1-31,1-31,1-" + endDate[2] + " " +
startDate[1] + "," + getFirstMMonth + "," + getSecMMonth + "," + endDate[1] + " *";
// System.out.println(" expression for month3 : " + exp);
}
if (ageInMonths == 2) {
Calendar middleMonth1 = (Calendar) startCal.clone();
middleMonth1.add(Calendar.MONTH, 1);
//System.out.println(" get middleDate month : " + middleMonth1.get(Calendar.MONTH));
int getMiddleMonth = middleMonth1.get(Calendar.MONTH);
if (getMiddleMonth == 0) {
getMiddleMonth = 12;
// System.out.println(" getMiddleMonth : " +getMiddleMonth );
}
// System.out.println(" Outside getMiddleMonth : " +getMiddleMonth );
endCal.set(Calendar.MONTH, 11);
//System.out.println(" get middleDate month 001: " + endCal.get(Calendar.MONTH));
exp = strTimeMin + " " + strTime + " " + startDate[2] + "-" + "31,1-31,1-" +
endDate[2] + " " + startDate[1] + "," +
getMiddleMonth + "," + endDate[1] + " *";
// System.out.println(" get end month2 : " + exp);
} else if (ageInMonths == 1) {
exp = strTimeMin + " " + strTime + " " + startDate[2] + "-31,1-" +
endDate[2] + " " + startDate[1] + "," + endDate[1] + " *";
//System.out.println(" expression for one month : " + exp);
}
} else {
exp = strTimeMin + " " + strTime + " " + startDate[2] + "-" + endDate[2] + " " + endDate[1] + " *";
}
System.out.println(" expression for before parameter : " + exp);
//Run with only Start Date
if (strRepeat != null && strRepeat.equalsIgnoreCase("No")) {
exp = strTimeMin + " " + strTime + " " + startDate[2] + " " + startDate[1] + " *";
} else if (strRepeat != null && strRepeat.equalsIgnoreCase("Daily")) {
exp = exp;
} else if (strRepeat != null && strRepeat.equalsIgnoreCase("Weekdays")) {
// System.out.println(" expression for weekdays before : " + exp);
exp = exp.replace("*", strCalDay);
// System.out.println(" expression for weekdays after : " + exp);
} else if (strRepeat != null && strRepeat.equalsIgnoreCase("Weekends")) {
// System.out.println(" expression for weekend before : " + exp);
exp = exp.replace("*", "6,7");
// System.out.println(" expression for weekend after : " + exp);
}
System.out.println(" cron expression ::: " + exp);
I am currently working on project using and arduino, a gyro, an accelerometer, and a Bluetooth chip to try to model some data. I am currently trying to gather data, package it up and send it to a phone via Bluetooth. The issue is the Bluetooth chip I am using is a low energy one and so it can only send messages of 20 bytes at a time. I am trying to get past this issue by storing the data collected for a certain amount of time then send it all in 20 byte bursts. I am currently testing this method without sending the data and just printing the data to the serial monitor. This is where my issue is arising, when printing the data in real time everything works but when I try to store it in an array I get this:
593,575,567,0,0,0
592,575,567,0,0,0
592,575,567,0,0,0
592,575,567,0,0,0
592,575,567,0,0,0
593,575,567,0,0,0
586,576,568,0,0,0
0,0,0
0,0
0,0
,0,0,0
0,0,0
As you can see it seems to just break. If anyone could help me out it would be great!
Here is the relevant code chunk
for(int i = 0; i < loopVal; i++)
{
yawGyroValDouble = 0;
pitchGyroValDouble = 0;
rollGyroValDouble = 0;
totalClicksY = 0;
angleY = 0;
totalClicksP = 0;
angleP = 0;
totalClicksR = 0;
angleR = 0;
xRe = 0;
yRe = 0;
zRe = 0;
s = "";
int starttime = millis(); // get start time
int endtime = starttime; // init end time
while ((endtime - starttime) < time)
{
getGyroValues(); // This will update rollGyroVal, pitchGyroVal, and yawGyroVal with new values
yawGyroValDouble =yawGyroVal;
if(abs(yawGyroValDouble) > abs(gyroNoiseThresh)){ // ignore noise
totalClicksY+=yawGyroValDouble; // update runsum
}
pitchGyroValDouble =pitchGyroVal;
if(abs(yawGyroValDouble) > abs(gyroNoiseThresh)){ // ignore noise
totalClicksP+=pitchGyroValDouble; // update runsum
}
rollGyroValDouble =rollGyroVal;
if(abs(yawGyroValDouble) > abs(gyroNoiseThresh)){ // ignore noise
totalClicksR+=rollGyroValDouble; // update runsum
}
xRe = analogRead(pinX);
yRe = analogRead(pinY);
zRe = analogRead(pinZ);
delay (gyroDelayTime);
endtime = millis();
}
angleY = totalClicksY / clicksPerDegCCW;
angleP = totalClicksP / clicksPerDegCCW;
angleR = totalClicksR / clicksPerDegCCW;
String yawSend = String(angleY);
String pitchSend = String(angleP);
String rollSend = String(angleR);
String xSend = String(xRe);
String ySend = String(yRe);
String zSend = String(zRe);
//s = "Accel - X: " + xSend + " Y: " + ySend + " Z: " + zSend + "\n" + "Gyro - Yaw: " + yawSend + " Pitch: " + pitchSend + " Roll: " + rollSend;
s = "" + xSend + "," + ySend + "," + zSend + "," + yawSend + "," + pitchSend + "," + rollSend;
Serial.println(s);
res[i] = s;
}
You didn't show where totalClicksY, totalClicksP, totalClicksR, and clicksPerDegCCW are declared, but I'm betting they are declared as integer types (int or long). If so, the result of your maths:
angleY = totalClicksY / clicksPerDegCCW;
angleP = totalClicksP / clicksPerDegCCW;
angleR = totalClicksR / clicksPerDegCCW;
will be integers. And if the results of those divisions are less than 1, they will be truncated to 0.
Try declaring totalClicksY, totalClicksP, totalClicksR and clicksPerDegCCW as double. That, or cast them when you do the math, like this:
angleY = (double)totalClicksY / (double)clicksPerDegCCW;
angleP = (double)totalClicksP / (double)clicksPerDegCCW;
angleR = (double)totalClicksR / (double)clicksPerDegCCW;
(I'm also assuming that angleY, angleP, and angleR are also declared as doubles - if not they definitely should be).
I am doing this in java, but the answer isn't java specific.
Here is my code:
String map = " x " +
" x o xxxx xxxx xxxx " +
" x xxxx " +
" xxxx xxxx " +
" xx xxxxxx " +
" xx " +
" xx " +
" xx x " +
" xx x " +
" xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ";
for(int i = 0; i < map.length(); i++) {
if(map.charAt(i) == 'x') {
platform[i] = CCSprite.sprite("platform_2.gif");
platform[i].setPosition(x, y); //How to get x and y?
addChild(platform[i]);
platformCount++;
}
}
As you can see, for every "x" in the map string, I want to create a new platform. Now, each line of the string is 57 characters long, and I need to get the X and Y value of where that X is, but all I can retrieve is the charAt the "i" variable, in the for statement. What is a logical way to do this?
int x = i % width;
int y = i / width;
…where % is modulo and / is integer division.