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Generating all days between 2 given dates in Java [duplicate]

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问题 This question already has answers here : how to get a list of dates between two dates in java (22 answers) Closed 2 years ago . I'm trying to get an array of Dates, while my input is a 'from'/'to' structure. So my input is: String date1 = "2014-01-01"; String date2 = "2014-05-01"; My output should be an Arraylist with all dates between date1 and date2. I've already looked for this, but I could only find questions about the difference between 2 dates: SimpleDateFormat myFormat = new

Generating all days between 2 given dates in Java [duplicate]

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Formatting milliseconds to hh:mm:ss format

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问题 I am having milliseconds value and want to display the time subtracting 5 minutes from current milliseconds value in hh:mm:ss format. Code String str = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours((cal.getTimeInMillis()-300000)), TimeUnit.MILLISECONDS.toMinutes(cal.getTimeInMillis()-300000) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(cal.getTimeInMillis()-300000)), TimeUnit.MILLISECONDS.toSeconds(cal.getTimeInMillis()-300000) - TimeUnit.MINUTES.toSeconds(TimeUnit

How do i set up a DelayQueue's Delay

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问题 I'm just starting out coding in java i'm in struggling with setting up a DelayQueue, I wanted to have it so, DelayQueue queue = new DelayQueue(); If (counter > 0){ queue.offer(Integer, *A custom delay*) } Else { queue.offer(Integer, *A different custom delay*) } I'm just trying to learn all the basics and ive read over the API and cant seem to grasp it. Thanks in advance 回答1: The DelayQueue keeps the elements internally until a certain delay has expired. The elements must implement the

How do i set up a DelayQueue's Delay

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Generating all days between 2 given dates in Java [duplicate]

阅读更多关于 Generating all days between 2 given dates in Java [duplicate]

This question already has answers here : how to get a list of dates between two dates in java (22 answers) Closed 2 years ago . I'm trying to get an array of Dates, while my input is a 'from'/'to' structure. So my input is: String date1 = "2014-01-01"; String date2 = "2014-05-01"; My output should be an Arraylist with all dates between date1 and date2. I've already looked for this, but I could only find questions about the difference between 2 dates: SimpleDateFormat myFormat = new SimpleDateFormat("dd MM yyyy"); String inputString1 = "23 01 1997"; String inputString2 = "27 04 1997"; try {

Android Work Manager: How to enqueue Jobs once a month

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问题 following this question, I looked into Android Job Scheduling and it seems like Work Manager is the latest tool if I want to do something once every month. I built a Worker class and activated it with this snippet in my activity: PeriodicWorkRequest myWorkRequest = new PeriodicWorkRequest.Builder(MonthlyWorker.class, 20, TimeUnit.MINUTES) .build(); WorkManager.getInstance().enqueueUniquePeriodicWork("my fancy test",ExistingPeriodicWorkPolicy.KEEP, myWorkRequest); While i tested the 20 minutes

How do i set up a DelayQueue's Delay

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I'm just starting out coding in java i'm in struggling with setting up a DelayQueue, I wanted to have it so, DelayQueue queue = new DelayQueue(); If (counter > 0){ queue.offer(Integer, *A custom delay*) } Else { queue.offer(Integer, *A different custom delay*) } I'm just trying to learn all the basics and ive read over the API and cant seem to grasp it. Thanks in advance The DelayQueue keeps the elements internally until a certain delay has expired. The elements must implement the interface java.util.concurrent.Delayed . For example I have created a class DelayedTest extending Delayed

How to convert nanoseconds to seconds using the TimeUnit enum?

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How to convert a value from nanoseconds to seconds? Here's the code segment: import java.io.*; import java.util.concurrent.*; .. class Stamper { public static void main (String[] args) { long start = System.nanoTime(); //some try with nested loops long end = System.nanoTime(); long elapsedTime = end - start; System.out.println("elapsed: " + elapsedTime + "nano seconds\n"); //convert to seconds TimeUnit seconds = new TimeUnit(); System.out.println("which is " + seconds.toSeconds(elapsedTime) + " seconds"); }} The error is Stamper.java:16: enum types may not be instantiated. What does this mean?

How to convert nanoseconds to seconds using the TimeUnit enum?

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问题 How to convert a value from nanoseconds to seconds? Here's the code segment: import java.io.*; import java.util.concurrent.*; .. class Stamper { public static void main (String[] args) { long start = System.nanoTime(); //some try with nested loops long end = System.nanoTime(); long elapsedTime = end - start; System.out.println("elapsed: " + elapsedTime + "nano seconds\n"); //convert to seconds TimeUnit seconds = new TimeUnit(); System.out.println("which is " + seconds.toSeconds(elapsedTime) +