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Page 573 of 589
How to format and display date in Java as '201904'
To format and display date like this i.e. YearMonth, you need to set the pattern:uuuuMMAt first, set a LocalDate:LocalDate localDate = LocalDate.now();Now format and display date as ‘201904’:localDate.format(DateTimeFormatter.ofPattern("uuuuMM"))Exampleimport java.time.LocalDate; import java.time.format.DateTimeFormatter; public class Demo { public static void main(String[] args) { LocalDate localDate = LocalDate.now(); System.out.println("Date = "+localDate); System.out.println("Date (Year and Month) = "+localDate.format(DateTimeFormatter.ofPattern("uuuuMM"))); } }OutputDate = 2019-04-19 Date (Year and Month) = 201904
Read MoreHow can I display Java date as '12/04/2019'
To format and display date like this i.e. Day/Month/Year, you need to set the pattern:dd/MM/yyyyAt first, set a LocalDate:LocalDate localDate = LocalDate.now();Now format and display date as '12/04/2019':localDate.format(DateTimeFormatter.ofPattern("dd/MM/yyyy"))Exampleimport java.time.LocalDate; import java.time.format.DateTimeFormatter; public class Demo { public static void main(String[] args) { LocalDate date = LocalDate.now(); System.out.println("Date = "+date); DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy"); System.out.println("Formatted Date = "+date.format(formatter)); } }OutputDate = 2019-04-12 Formatted Date = 12/04/2019
Read MoreJava Program to convert a list to a read-only list
Let’s say the following is our list which isn’t read-only:List < Integer > list = new ArrayList < Integer > (); list.add(10); list.add(20); list.add(30); list.add(40); list.add(50); list.add(20); list.add(40); list.add(50);Convert the above list to Read-only:list = Collections.unmodifiableList(list);On conversion, now you won’t be add or remove elements from the List. Let us see an example:The following program will give an error because we first update the list to read only and then try to remove an element from it, which is not possible now. The reason is we have converted the list to readonly and you cannot add or remove element from ...
Read MoreJava Program to check for the supported attribute via java.nio.file.FileStore
Following is our file:Path p = Paths.get("E:/input.txt"); FileStore file = Files.getFileStore(p);Now, check for the supported attributes one by one:FileAttributeView = file.supportsFileAttributeView(FileAttributeView.class) PosixFileAttributeView = file.supportsFileAttributeView(PosixFileAttributeView.class) BasicFileAttributeView = file.supportsFileAttributeView(BasicFileAttributeView.class)Exampleimport java.nio.file.FileStore; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.nio.file.attribute.BasicFileAttributeView; import java.nio.file.attribute.FileAttributeView; import java.nio.file.attribute.FileOwnerAttributeView; import java.nio.file.attribute.PosixFileAttributeView; public class Demo { public static void main(String[] args) throws Exception { Path p = Paths.get("E:/input.txt"); FileStore file = Files.getFileStore(p); System.out.println("FileAttributeView = " + file.supportsFileAttributeView(FileAttributeView.class)); System.out.println("PosixFileAttributeView = "+ file.supportsFileAttributeView(PosixFileAttributeView.class)); System.out.println("BasicFileAttributeView = "+ file.supportsFileAttributeView(BasicFileAttributeView.class)); System.out.println("FileOwnerAttributeView supported = "+ file.supportsFileAttributeView(FileOwnerAttributeView.class)); ...
Read MoreJava Program to format date as Apr 19, 2019, 1:27 PM
To format and display datetime, you need to use DateTimeFormatter. The format style is MEDIUM and SHORT:DateTimeFormatter formatter = DateTimeFormatter .ofLocalizedDateTime(FormatStyle.MEDIUM, FormatStyle.SHORT);Display the formatted date:formatter.format(LocalDateTime.now()Exampleimport java.time.LocalDateTime; import java.time.format.DateTimeFormatter; import java.time.format.FormatStyle; public class Demo { public static void main(String[] args) { DateTimeFormatter formatter = DateTimeFormatter .ofLocalizedDateTime(FormatStyle.MEDIUM, FormatStyle.SHORT); System.out.println("Formatted Date = "+formatter.format(LocalDateTime.now())); } }OutputFormatted Date = Apr 19, 2019, 1:27 PM
Read MoreJava Program to format LocalDateTime as ISO_WEEK_DATE format
At first, set the date:LocalDateTime dateTime = LocalDateTime.of(2019, Month.SEPTEMBER, 9, 10, 20);Now, format the datetime as ISO_WEEK_DATE format:String str = dateTime.format(DateTimeFormatter.ISO_WEEK_DATE);Exampleimport java.time.LocalDateTime; import java.time.Month; import java.time.format.DateTimeFormatter; public class Demo { public static void main(String[] args) { LocalDateTime dateTime = LocalDateTime.of(2019, Month.SEPTEMBER, 9, 10, 20); System.out.println("DateTime = "+dateTime); String str = dateTime.format(DateTimeFormatter.ISO_WEEK_DATE); System.out.println("Formatted date = "+str); } }OutputDateTime = 2019-09-09T10:20 Formatted date = 2019-W37-1
Read MoreJava Program to format LocalTimeDate as BASIC_ISO_DATE format
At first, set the date:LocalDateTime dateTime = LocalDateTime.of(2019, Month.SEPTEMBER, 6, 20, 10);Now, format the datetime as BASIC_ISO_DATE format:String str = dateTime.format(DateTimeFormatter.BASIC_ISO_DATE);Exampleimport java.time.LocalDateTime; import java.time.Month; import java.time.format.DateTimeFormatter; public class Demo { public static void main(String[] args) { LocalDateTime dateTime = LocalDateTime.of(2019, Month.SEPTEMBER, 6, 20, 10); System.out.println("DateTime = "+dateTime); String str = dateTime.format(DateTimeFormatter.BASIC_ISO_DATE); System.out.println("Formatted date = "+str); } }OutputDateTime = 2019-09-06T20:10 Formatted date = 20190906
Read MoreHow to sort an array with customized Comparator in Java?
Let’s say the following is our string array and we need to sort it:String[] str = { "Tom", "Jack", "Harry", "Zen", "Tim", "David" };Within the sort() method, create a customized comparator to sort the above string. Here, two strings are compared with each other and the process goes on:Arrays.sort(str, new Comparator < String > () { public int compare(String one, String two) { int val = two.length() - one.length(); if (val == 0) val = one.compareToIgnoreCase(two); return val; } });Exampleimport java.util.Arrays; import java.util.Comparator; public class Demo ...
Read MoreJava Program to get Temporal Queries precision
To get Temporal Queries precision, use the TemporalQuery interface with the precision() method of the TemporalQueries −TemporalQueryprecision = TemporalQueries.precision(); Get the precision for LocalDate: LocalDate.now().query(precision) Get the precision for LocalTime: LocalTime.now().query(precision) Get the precision for YearMonth: YearMonth.now().query(precision) Get the precision for Year: Year.now().query(precision)Exampleimport java.time.LocalDate; import java.time.LocalDateTime; import java.time.LocalTime; import java.time.Year; import java.time.YearMonth; import java.time.temporal.TemporalQueries; import java.time.temporal.TemporalQuery; import java.time.temporal.TemporalUnit; public class Demo { public static void main(String[] args) { TemporalQueryprecision = TemporalQueries.precision(); System.out.println("TemporalQueries precision..."); System.out.println(LocalDate.now().query(precision)); System.out.println(LocalTime.now().query(precision)); System.out.println(LocalDateTime.now().query(precision)); System.out.println(YearMonth.now().query(precision)); System.out.println(Year.now().query(precision)); ...
Read MoreHow do I discover the Quarter of a given Date in Java?
Let us first get the current date −LocalDate currentDate = LocalDate.now();Now, use the Calendar class and set the locale −Calendar cal = Calendar.getInstance(Locale.US);Now, get the month −int month = cal.get(Calendar.MONTH);Find the Quarter −int quarter = (month / 3) + 1;Exampleimport java.time.LocalDate; import java.util.Calendar; import java.util.Locale; public class Demo { public static void main(String[] args) { LocalDate currentDate = LocalDate.now(); System.out.println("Current Date = "+currentDate); Calendar cal = Calendar.getInstance(Locale.US); int month = cal.get(Calendar.MONTH); int quarter = (month / 3) + 1; System.out.println("Quarter = "+quarter); } }OutputCurrent Date = 2019-04-12 Quarter = 2
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