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Java Articles
Page 85 of 450
Java Program to check whether the character is ASCII 7 bit
To check whether the character is ASCII 7 bit or not, check whether given value’s ASCII value is less than 128 or not.Here, we have a character.char one = '-';Now, we have checked a condition with if-else for ASCII 7-bit character.if (c < 128) { System.out.println("Given value is ASCII 7 bit!"); } else { System.out.println("Given value is not an ASCII 7 bit!"); }The following is an example wherein we check a character for ASCII 7-bit.Examplepublic class Demo { public static void main(String []args) { char c = '-'; System.out.println("Given value = "+c); ...
Read MoreConvert from String to long in Java
To convert String to long, the following are the two methods.Method 1The following is an example wherein we use parseLong() method.Examplepublic class Demo { public static void main(String[] args) { String myStr = "5"; Long myLong = Long.parseLong(myStr); System.out.println("Long: "+myLong); } }OutputLong: 5Method 2The following is an example wherein we have used valueOf() and longValue() method to convert String to long.Examplepublic class Demo { public static void main(String[] args) { String myStr = "20"; long res = Long.valueOf(myStr).longValue(); System.out.println("Long: "+res); } }OutputLong: 20
Read MoreDisplay the day in week using SimpleDateFormat('E') in Java
To display the day in week, use the SimpleDateFormat(“E”) as shown below −Format f = new SimpleDateFormat("E"); String strDayinWeek = f.format(new Date()); System.out.println("Day in week = "+strDayinWeek);Since, we have used the Format and SimpleDateFormat class above, therefore import the following packages. With that, we have also used the Date.import java.text.Format; import java.text.SimpleDateFormat; import java.util.Date;Exampleimport java.text.Format; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Calendar; public class Demo { public static void main(String[] args) throws Exception { // displaying current date and time Calendar cal = Calendar.getInstance(); SimpleDateFormat simpleformat = new SimpleDateFormat("dd/MMMM/yyyy hh:mm:s"); ...
Read MoreJava Program to get full day name
To display the full day name, use the SimpleDateFormat(“EEEE”) as shown below −// displaying full-day name f = new SimpleDateFormat("EEEE"); String str = f.format(new Date()); System.out.println("Full Day Name = "+str);Since, we have used the Format and SimpleDateFormat class above, therefore import the following packages. With that, we have also used the Date.import java.text.Format; import java.text.SimpleDateFormat; import java.util.Date;Exampleimport java.text.Format; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Calendar; public class Demo { public static void main(String[] args) throws Exception { // displaying current date and time Calendar cal = Calendar.getInstance(); SimpleDateFormat simpleformat = new ...
Read MoreJava Program to display previous day from GregorianCalender
For GregorianCalendar class, import the following package.import java.util.GregorianCalendar;Create an object.GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance();Now, use the following field and add() method with a negative one (-1) to display the previous day.cal.add((GregorianCalendar.DATE), -1)Exampleimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo { public static void main(String[] a) { GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance(); System.out.println("Current date: " + cal.getTime()); // past date cal.add((GregorianCalendar.DATE), -1); System.out.println("Modified date (Previous Day): " + cal.getTime()); } }OutputCurrent date: Mon Nov 19 18:12:53 UTC 2018 Modified date (Previous Day): Sun Nov 18 18:12:53 UTC 2018
Read MoreDetermine day of week in month from Gregorian Calendar in Java
To work with the GregorianCalendar class, import the following package −import java.util.GregorianCalendar;To get the day of week in month, use the following field −cal.get(Calendar.DAY_OF_WEEK_IN_MONTH)Above, cal is the GregorianCalendar object we created before −GregorianCalendar cal = new GregorianCalendar();The following is an example −Exampleimport java.util.GregorianCalendar; import java.util.Calendar; import java.util.Date; public class Demo { public static void main(String[] args) { GregorianCalendar cal = new GregorianCalendar(); // date information System.out.println("Date Information.........."); System.out.println("Year = " + cal.get(Calendar.YEAR)); System.out.println("Month = " + (cal.get(Calendar.MONTH) + 1)); System.out.println("Date = ...
Read MoreJava Program to return a Date set to the last possible millisecond of the day before midnight
Let us first set the calendar object.Calendar calendar = Calendar.getInstance();Use the getMaximum() method in Java to returns the maximum value for the given calendar field. We will use it to set the minute, hours second and milliseconds.For hour and minute.calendar.set(Calendar.HOUR_OF_DAY, calendar.getMaximum(Calendar.HOUR_OF_DAY)); calendar.set(Calendar.MINUTE, calendar.getMaximum(Calendar.MINUTE));For second and milliseconds.// second calendar.set(Calendar.SECOND, calendar.getMaximum(Calendar.SECOND)); // millisecond calendar.set(Calendar.MILLISECOND, calendar.getMaximum(Calendar.MILLISECOND));The following is an example that returns a Date set to the last possible millisecond of the day before midnight.Exampleimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo { public static void main(String[] argv) throws Exception { Calendar calendar = Calendar.getInstance(); // hour ...
Read MoreJava Program to return a Date set to the first possible millisecond of the day after midnight
Let us first set the calendar object.Calendar calendar = Calendar.getInstance();Use the getMinimum() method in Java to return the minimum value for the given calendar field. We will use it to set the minute, hours second and milliseconds.For hour and minute.calendar.set(Calendar.HOUR_OF_DAY, calendar.getMinimum(Calendar.HOUR_OF_DAY)); calendar.set(Calendar.MINUTE, calendar.getMinimum(Calendar.MINUTE));For second and milliseconds.// second calendar.set(Calendar.SECOND, calendar.getMinimum(Calendar.SECOND)); // millisecond calendar.set(Calendar.MILLISECOND, calendar.getMinimum(Calendar.MILLISECOND));The following is an example that returns a Date set to the first possible millisecond of the day after midnight.Exampleimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo { public static void main(String[] argv) throws Exception { Calendar calendar = Calendar.getInstance(); // hour ...
Read MoreConvert double primitive type to a Double object in Java
To convert double primitive type to a Double object, you need to use Double constructor.Let’s say the following is our double primitive.// double primitive double val = 23.78;To convert it to a Double object, use Double constructor.// Double object Double ob = new Double(val);Examplepublic class Demo { public static void main(String args[]) { // double primitive double val = 23.78; // Double object Double ob = new Double(val); System.out.println(ob); } }Output23.78
Read MoreFormat double type in Java
Let’s say we have the following three values −double val1 = 15.546; double val2 = 25.87; double val3 = Math.PI;Let us now format these double-type numbers. Firstly, we are formatting Euler’s number with Math.exp(). After that, we have also evaluated log. The %.3f you can see here is what we used for formatting the numbers.System.out.printf("exp(%.3f) = %.3f%n", val1, Math.exp(val1)); System.out.printf("log = %.3f%n", val1, Math.log(val1));The following is an example where we have also shown other ways to format double in Java.Examplepublic class Demo { public static void main(String args[]) { double val1 = 15.546; ...
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