time

问题 I have return a below code in java to produce the possible binary representation of n digits. public List<String> binaryRepresenation(int n){ List<String> list = new ArrayList<>(); if(n>0){ permuation(n, list, ""); } return list; } private void permuation(int n, List<String> list, String str){ if(n==0){ list.add(str); }else{ permuation(n-1, list, str+"0"); permuation(n-1, list, str+"1"); } } For n=3, it produces 001 001 010 011 100 101 110 111 combinations. Overall this function produces 2^n

问题 I have return a below code in java to produce the possible binary representation of n digits. public List<String> binaryRepresenation(int n){ List<String> list = new ArrayList<>(); if(n>0){ permuation(n, list, ""); } return list; } private void permuation(int n, List<String> list, String str){ if(n==0){ list.add(str); }else{ permuation(n-1, list, str+"0"); permuation(n-1, list, str+"1"); } } For n=3, it produces 001 001 010 011 100 101 110 111 combinations. Overall this function produces 2^n

问题 I am trying to compute time lapsed in java using nanoTime. But everytime it gives me different results. Why it is not consistent always ? Sample code : long startTime=System.nanoTime(); String.valueOf(number).length(); long endTime = System.nanoTime(); System.out.println(endTime-startTime); 回答1: nanoTime() and its sister currentTimeMillis() are not exact and depending on the architecture you run your code on they suffer from rounding (see the javadoc for details): This method provides

问题 I have a problem to convert a java.sql.Time (UTC) which is fetched from a database to a java.time.LocalTime (GMT+1 DST). It is always missing the DST hour. So like a Time of 03:00 is only converted to a LocalTime of 04:00 instead of 05:00. //Saved UTC time in DB: 03:00 LocalTime.ofInstant(Instant.ofEpochMilli(sqlTime.getTime()), ZoneId.of("Europe/Berlin")); => 04:00 //expected 05:00 I guess the problem is that java.sql.Time saves the time with a default date of 1970-01-01 and in 1970 there

问题 I'm using Schema.org OpeningHoursSpecification in JSON-LD in such a way: [{"@type":"OpeningHoursSpecification","dayOfWeek": ["Monday","Tuesday","Wednesday","Thursday","Friday"],"open":"08:00","closes":"20:00"},{"@type":"OpeningHoursSpecification","dayOfWeek":["Saturday"],"open":"08:00","closes":"14:00"},{"@type":"OpeningHoursSpecification","dayOfWeek":["Sunday"],"open":"00:00","closes":"00:00"}] I couldn't find any example for adapting this specification to include "siesta" - a situation when

问题 I am automating a excel report using the POI API for Java. I will have few reports in my disposal which I read using POI, process them, and create a new excel report. One of columns from an excel file has total time spent, that is, it could in following format, 46:23:12 - this reads as 46 hours, 23 minutes and 12 seconds . I understand how to read date and time values and I usually store them in java.util.Date . The problem here is this is a time duration, the hours spent could be more than

问题 I am automating a excel report using the POI API for Java. I will have few reports in my disposal which I read using POI, process them, and create a new excel report. One of columns from an excel file has total time spent, that is, it could in following format, 46:23:12 - this reads as 46 hours, 23 minutes and 12 seconds . I understand how to read date and time values and I usually store them in java.util.Date . The problem here is this is a time duration, the hours spent could be more than

问题 I am automating a excel report using the POI API for Java. I will have few reports in my disposal which I read using POI, process them, and create a new excel report. One of columns from an excel file has total time spent, that is, it could in following format, 46:23:12 - this reads as 46 hours, 23 minutes and 12 seconds . I understand how to read date and time values and I usually store them in java.util.Date . The problem here is this is a time duration, the hours spent could be more than

问题 I am automating a excel report using the POI API for Java. I will have few reports in my disposal which I read using POI, process them, and create a new excel report. One of columns from an excel file has total time spent, that is, it could in following format, 46:23:12 - this reads as 46 hours, 23 minutes and 12 seconds . I understand how to read date and time values and I usually store them in java.util.Date . The problem here is this is a time duration, the hours spent could be more than

问题 I'm trying to achieve a countdown timer that would use a specific date and time for it to start. From there I need it to countdown from 1 hour and then update the initial date and time by adding an hour and then repeat itself indefinitely. This is used for a product auction that would get a new product once one sells out and the price drops every hour from when it is added to the auction which could be any time of day. Example: I need this timer to start on 2014, 7, 25, 11, 30, 0, 0 (August