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Java Articles
Page 87 of 450
Narrowing Conversion in Java
Narrowing conversion is needed when you convert from a larger size type to a smaller size. This is for incompatible data types, wherein automatic conversions cannot be done.Let us see an example wherein we are converting long to integer using Narrowing Conversion.Examplepublic class Demo { public static void main(String[] args) { long longVal = 878; int intVal = (int) longVal; System.out.println("Long: "+longVal); System.out.println("Integer: "+intVal); } }OutputLong: 878 Integer: 878Let us see another example, wherein we are converting double to long using Narrowing Conversion.Examplepublic class Demo { public static void main(String[] args) { double doubleVal = 299.89; long longVal = (long)doubleVal; System.out.println("Double: "+doubleVal); ...
Read MoreUnix date format in Java
Use the ‘c’ date conversion character to display UNIX date format in Java.System.out.printf("Unix date format: %tc",d);Above, d is a date object.Date d = new Date();Exampleimport java.util.Date; import java.text.DateFormat; import java.text.SimpleDateFormat; public class Demo { public static void main(String[] args) throws Exception { Date d = new Date(); System.out.printf("Unix date format: %tc",d); System.out.printf("Unix date format: %Tc",d); } }OutputUnix date format: Mon Nov 26 12:24:10 UTC 2018 Unix date format: MON NOV 26 12:24:10 UTC 2018
Read MoreConvert string of time to time object in Java
Here is our string.String strTime = "20:15:40";Now, use the DateFormat to set the format for date.DateFormat dateFormat = new SimpleDateFormat("hh:mm:ss");Parse the string of time to time object.Date d = dateFormat.parse(strTime);The following is the complete example.Exampleimport java.text.DateFormat; import java.util.Date; import java.text.SimpleDateFormat; public class Demo { public static void main(String[] args) throws Exception { String strTime = "20:15:40"; DateFormat dateFormat = new SimpleDateFormat("hh:mm:ss"); Date d = dateFormat.parse(strTime); System.out.println("Resultant Date and Time = " + d); } }OutputResultant Date and Time = Thu Jan 01 20:15:40 UTC 1970
Read MoreIntegral conversion characters in Java
Intergral conversion characters include the following.CharacterDescription%dInteger%oOctal%xHexadecimal%XHexadecimalExamplepublic class Demo { public static void main(String[] args) throws Exception { System.out.printf( "Integer: %d", 889 ); System.out.printf( "Negative Integer: %d", -78 ); System.out.printf( "Octal: %o", 677 ); System.out.printf( "Hexadecimal: %x", 56 ); System.out.printf( "Hexadecimal: %X", 99 ); } }OutputInteger: 889 Negative Integer: -78 Octal: 1245 Hexadecimal: 38 Hexadecimal: 63
Read MoreConversion characters for date in Java
The following are the conversion characters for date-time −CharacterDescriptioncComplete date and timeFISO 8601 dateDU.S. formatted date (month/day/year)T24-hour timer12-hour timeR24-hour time, no secondsYFour-digit year (with leading zeroes)yLast two digits of the year (with leading zeroes)CFirst two digits of the year (with leading zeroes)BFull month namebAbbreviated month namemTwo-digit month (with leading zeroes)dTwo-digit day (with leading zeroes)eTwo-digit day (without leading zeroes)AFull weekday nameaAbbreviated weekday namejThree-digit day of year (with leading zeroes)HTwo-digit hour (with leading zeroes), between 00 and 23kTwo-digit hour (without leading zeroes), between 0 and 23ITwo-digit hour (with leading zeroes), between 01 and 12lTwo-digit hour (without leading zeroes), between 1 and 12MTwo-digit ...
Read MoreDisplay numbers with thousands separator in Java
To display number with thousands separator, set a comma flag.System.out.printf( "%,d",78567);The above would result.78, 567Let’s check for bigger numbers.System.out.printf( "%,d", 463758);The above would result.463,758Examplepublic class Demo { public static void main( String args[] ) { System.out.printf( "%,d", 95647 ); System.out.printf( "%,d", 687467 ); System.out.printf( "%,.2f", 7546.21 ); System.out.printf( "%,.2f", 463758.787 ); System.out.printf( "%,.2f", 123456.5 ); } }Output95,647 687,467 7,546.21 463,758.79 123,456.50
Read MoreLocale-specific morning/afternoon indicator in Java
Locale-specific morning/afternoon indicator is the AM/PM marker indicator.Use the ‘p’ conversion character to display AM/PM.System.out.printf("Morning/afternoon indicator: %tp",d);Exampleimport java.util.Date; public class Demo { public static void main(String[] args) { Date d = new Date(); System.out.printf("Morning/afternoon indicator: %tp",d); System.out.printf("Morning/afternoon indicator: %Tp",d); } }OutputMorning/afternoon indicator: pm Morning/afternoon indicator: PM
Read MoreDisplay localized month name with printf method in Java
To display localized method name in Java, use the ‘B’ conversion character.System.out.printf("Localized month : %TB", d);To display method name in lowercase, use the “%tb”System.out.printf("Localized month : %tB", d);Exampleimport java.util.Date; public class Demo { public static void main(String[] args) { Date d = new Date(); System.out.printf("Morning/afternoon indicator: %tp", d); System.out.printf("Morning/afternoon indicator: %Tp", d); System.out.printf("Localized month : %tB", d); System.out.printf("Localized month : %TB", d); } }OutputMorning/afternoon indicator: pm Morning/afternoon indicator: PM Localized month : November Localized month : NOVEMBERRight justify and left justify values in ...
Read MoreArgument Index in Java
Argument indices allow programmers to reorder the output. Let us see an example.Examplepublic class Demo { public static void main(String[] args) { System.out.printf("Before reordering = %s %s %s %s %s %s", "one", "two", "three", "four", "five", "six" ); System.out.printf("After reordering = %6$s %5$s %4$s %3$s %2$s %1$s", "one", "two", "three", "four", "five", "six" ); System.out.printf("Before reordering = %d %d %d", 100, 200, 300); System.out.printf("After reordering = %2$d %3$d %1$d", 100, 200, 300); } }OutputBefore reordering = one two three four five six After reordering = six ...
Read MoreCreating String Object from Character Array in Java
Here is our character array.char[] ch = { 'T', 'E', 'S', 'T'};To create string object from the above character array is quite easy. Add the array to the string parameter as shown below −String str = new String(ch);Examplepublic class Demo { public static void main(String[] args) { char[] ch = { 'T', 'E', 'S', 'T'}; String str = new String(ch); System.out.println(str); } }OutputTEST
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