Programming Articles - Page 2967 of 3366

In this article, we will learn how to convert a string to a float-type number in Java. We will use the Float.parseFloat() method to perform this conversion. Float.parseFloat() method The Float.parseFloat() method belongs to the Float class in Java and is used to convert a string representation of a number into a primitive float. If the string does not contain a valid float representation, it throws a NumberFormatException. NumberFormatException: Thrown to show that the application has attempted to convert a string to one of the numeric types, but that the string does not have the appropriate format. ... Read More

To convert String to float, use the valueOf() method.Let’s say we have the following string value.String str = "0.8";Converting the string to float.Float floatVal = Float.valueOf(str).floatValue();The following is the complete example.Example Live Demopublic class Demo {    public static void main(String args[]) {       String str = "0.8";       Float floatVal = Float.valueOf(str).floatValue();       System.out.println("Float: "+floatVal);    } }OutputFloat: 0.8

To convert float to string, use the toString() method. It represents a value in a string.Let’s say the following is our float.float f = 0.9F;Converting the float value to string.String s = Float.toString(f);Let us see the complete example to convert float to String in Java with output.Example Live Demopublic class Demo {    public static void main(String args[]) {       float f = 0.9F;       String s = Float.toString(f);       System.out.println(s);    } }Output0.9

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.Example Live Demoimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo {    public static void main(String[] argv) throws Exception {       Calendar calendar = Calendar.getInstance();       // ... Read More

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.Example Live Demoimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo {    public static void main(String[] argv) throws Exception {       Calendar calendar = Calendar.getInstance();       // ... Read More

To format a date in Java, firstly import the following package.import java.text.DateFormat;Now, create DateFormat object.DateFormat shortFormat = DateFormat.getDateInstance(DateFormat.SHORT); DateFormat longFormat = DateFormat.getDateInstance(DateFormat.LONG);Use the format() method to format the above dates.System.out.println(shortFormat.format(new Date())); System.out.println(longFormat.format(new Date()));To parse the dates, use the parse() method.Example Live Demoimport java.text.DateFormat; import java.text.ParseException; import java.util.Date; public class Demo {    public static void main(String[] args) throws Exception {       // format date       DateFormat shortFormat = DateFormat.getDateInstance(DateFormat.SHORT);       DateFormat longFormat = DateFormat.getDateInstance(DateFormat.LONG);       System.out.println("Format Date...");       System.out.println(shortFormat.format(new Date()));       System.out.println(longFormat.format(new Date()));       // parse date ... Read More

To display weekday names in Java, use the getWeekdays() method.For that, firstly import the following package.import java.text.DateFormatSymbols;Now, create a string array and get all the weekday names using the getWeekdays() method.String[] weekDays = new DateFormatSymbols().getWeekdays();Example Live Demoimport java.text.DateFormatSymbols; public class Demo {    public static void main(String[] args) {       String[] weekDays = new DateFormatSymbols().getWeekdays();       System.out.println("Weekday names...");       for(String days: weekDays){       System.out.println(days);    } } }OutputWeekday names... Sunday Monday Tuesday Wednesday Thursday Friday Saturday

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 −Example Live Demoimport 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 More

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)Example Live Demoimport 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 ... Read More

The GregorianCalendar class in Java allows us to manipulate dates and times easily. In this example, we will create a GregorianCalendar object and use it to display the current date and the date of the previous month. Problem Statement Write a Java program and create a GregorianCalendar object, display the current date, and then modify this date to show the date of the previous month. Output Current date: Mon Nov 19 18:07:03 UTC 2018 Input Modified date (Previous Month): Fri Oct 19 18:07:03 UTC 2018 Steps to display previous month from GregorianCalendar Below are the steps to display previous ... Read More