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Object Oriented Programming Articles
Page 281 of 589
Apply modulus operator to floating-point values in Java
To apply modulus (%) operator to floating-point values in an effortless task. Let us see how.We have the following two values −double one = 9.7; double two = 1.2;Let us now apply the modulus operator −one % twoThe following is the complete example that displays the output as well −Examplepublic class Demo { public static void main(String args[]) { double one = 9.7; double two = 1.2; System.out.println( one % two ); } }Output0.09999999999999964
Read MoreJava program to print the initials of a name with last name in full
When the full name is provided, the initials of the name are printed with the last name is printed in full. An example of this is given as follows −Full name = Amy Thomas Initials with surname is = A. ThomasA program that demonstrates this is given as follows −Exampleimport java.util.*; public class Example { public static void main(String[] args) { String name = "John Matthew Adams"; System.out.println("The full name is: " + name); System.out.print("Initials with surname is: "); int len = name.length(); name ...
Read MoreHow to display Java Runtime Environment (JRE) version
Use the System.getProperty() method in Java to get the Java Runtime Environment.It’s syntax is −String getProperty(String key)Above, the key is the name of the system property. Since, we want the Java Runtime Environment name, therefore we will add the key as −java.versionThe following is an example −Examplepublic class Demo { public static void main(String[] args) { System.out.print("Java Specification Version: "); System.out.println(System.getProperty("java.specification.version")); System.out.print("java Runtime Environment (JRE) version: "); System.out.println(System.getProperty("java.version")); } }OutputJava Specification Version: 1.8 java Runtime Environment (JRE) version: 1.8.0_141
Read MoreDisplay path separator in Java
To display the path separator, use the Properties class and import the following package −import java.util.Properties;Use the getProperties() method first and create an object −Properties p = System.getProperties();Now, set the key for path separator −p.getProperty("path.separator")The following is an example −Exampleimport java.util.Properties; public class Demo { public static void main(String[] args) { Properties p = System.getProperties(); System.out.println("Separator is "+p.getProperty("path.separator")); } }OutputSeparator is :
Read MoreGet Java Home Directory
Use the System.getProperty() method in Java to get the Java Home Directory.It’s syntax is −String getProperty(String key)Above, the key is the name of the system property. Since, we want the Java Home Directory name, therefore we will add the key as −java.homeThe following is an example −Examplepublic class Demo { public static void main(String[] args) { System.out.println("Get Java Home Directory = " + System.getProperty("java.home")); System.out.print("Java Specification Version: "); System.out.println(System.getProperty("java.specification.version")); System.out.print("java Runtime Environment (JRE) ...
Read MoreJava Program to return a Date set to the last possible millisecond of the month before midnight
Use the getMaximum() method in Java to returns the maximum value for the given calendar field. We will use it to set the minute, second and millisecond.Let us first declare a calendar object −Calendar dateNoon = Calendar.getInstance();Now, we will set the hour, minute, second and millisecond to the last possible millisecond on the month before midnight.// hour, minute and second calendar.set(Calendar.HOUR_OF_DAY, calendar.getMaximum(Calendar.HOUR_OF_DAY)); calendar.set(Calendar.MINUTE, calendar.getMaximum(Calendar.MINUTE)); calendar.set(Calendar.SECOND, calendar.getMaximum(Calendar.SECOND)); // millisecond calendar.set(Calendar.MILLISECOND, calendar.getMaximum(Calendar.MILLISECOND));Now, do the following for month and day of month −calendar.set(Calendar.DAY_OF_MONTH, 1); // first day of month calendar.add(Calendar.MONTH, 1); calendar.add(Calendar.DAY_OF_MONTH, -1);The following is an example to return a Date set to ...
Read MoreJava Program to return a Date set to the first possible millisecond of the month after midnight
Use the getMaximum() method in Java to returns the maximum value for the given calendar field. We will use it to set the minute, second and milliseconds.Let us first declare a calendar object −Calendar dateNoon = Calendar.getInstance();Now, we will set the hour, minute, second and millisecond to the first possible millisecond of the month after midnight −// hour, minute and second calendar.set(Calendar.HOUR_OF_DAY, calendar.getMaximum(Calendar.HOUR_OF_DAY)); calendar.set(Calendar.MINUTE, calendar.getMaximum(Calendar.MINUTE)); calendar.set(Calendar.SECOND, calendar.getMaximum(Calendar.SECOND)); // millisecond calendar.set(Calendar.MILLISECOND, calendar.getMaximum(Calendar.MILLISECOND));The following is an example that return a Date set to the first possible millisecond of the month after midnight −Exampleimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo { ...
Read MoreJava Program to return a Date set to the last possible millisecond of the minute
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, second and milliseconds.For seconds −calendar.set(Calendar.SECOND, calendar.getMaximum(Calendar.SECOND));For milliseconds −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 minute −Exampleimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo { public static void main(String[] argv) throws Exception { Calendar calendar = Calendar.getInstance(); // seconds calendar.set(Calendar.SECOND, calendar.getMaximum(Calendar.SECOND)); // milliseconds ...
Read MoreGet Operating System temporary directory / folder in Java
To get the temporary directory in Java, use the System.getProperty() method. Use theIt’s syntax is −String getProperty(String key)Above, the key is the name of the system property. Since, we want the Java Home Directory name, therefore we will add the key as −java.io.tmpdirThe following is an example −Examplepublic class Demo { public static void main(String []args){ String strTmp = System.getProperty("java.io.tmpdir"); System.out.println("OS current temporary directory: " + strTmp); System.out.println("OS Name: " + System.getProperty("os.name")); System.out.println("OS ...
Read MoreLocale-specific formatting in Java
For locale-specific formatting, firstly import the following packages.import java.util.Calendar; import java.util.Formatter; import java.util.Locale;Create a Formatter and Calendar object −Formatter f = new Formatter(); Calendar c = Calendar.getInstance();We are formatting for different Locales −f.format(Locale.TAIWAN, "Locale.TAIWAN: %tc", c); f.format(Locale.ITALY, "Locale.ITALY: %tc", c);The following is an example −Exampleimport java.util.Calendar; import java.util.Formatter; import java.util.Locale; public class Demo { public static void main(String args[]) { Formatter f = new Formatter(); Calendar c = Calendar.getInstance(); f.format(Locale.TAIWAN, "Locale.TAIWAN: %tc", c); ...
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