In order to remove a substring from a Java StringBuilder Object, we use the delete() method. The delete() method removes characters in a range from the sequence. The delete() method has two parameters, start, and end. Characters are removed from start to end-1 index.Declaration − The java.lang.StringBuilder.delete() method is declared ... Read More

Before moving onto their conversions, let us learn about Unicode and UTF-8.Unicode is an international standard of character encoding which has the capability of representing a majority of written languages all over the globe. Unicode uses hexadecimal to represent a character. Unicode is a 16-bit character encoding system. The lowest ... Read More

In order to print the stack trace in Java, we use the java.lang.Throwable.printStackTrace() method. The printStackTrace() method prints the throwable and its backtrace in the standard error stream.Declaration - The java.lang.Throwable.printStackTrace() method is declared as follows −public void printStackTrace()Let us see a program to print the stack trace in Java.Example Live ... Read More

Here, $push can be used to add new documents in nested array. To understand the above $push concept, let us create a collection with nested array document. The query to create a collection with document is as follows:>db.nestedArrayDemo.insertOne({"EmployeeName":"Larry", "EmployeeSalary":9000, "EmployeeDetails":    [{"EmployeeDOB":new Date('1990-01-21'), "EmployeeDepartment":"ComputerScience", "EmployeeProject":    [{"Technology":"C", "Duration":6}, {"Technology":"Java", "Duration":7}]}]});The ... Read More

To format the message with date in Java, we use the MessageFormat class and the Date class. The MessageFormat class gives us a way to produce concatenated messages which are not dependent on the language. The MessageFormat class extends the Serializable and Cloneable interfaces.Declaration - The java.text.MessageFormat class is declared as ... Read More

To format message with medium style format of date in Java, we use the MessageFormat class and the Date class. The MessageFormat class gives us a way to produce concatenated messages which are not dependent on the language. The MessageFormat class extends the Serializable and Cloneable interfaces.Declaration − The java.text.MessageFormat ... Read More

In order to get the name of the Thread, we use the getName() method in Java. This method returns the name of the thread.Declaration − The java.lang.Thread.getName() method is declared as follows −public String getName()In order to get the identity of the Thread, we use the getId() method in Java. ... Read More

In order to handle the assertion error, we need to declare the assertion statement in the try block and catch the assertion error in the catch block.Let us see a program on how to handle Assertion Error in Java −Examplepublic class Example {    public static void main(String[] args) throws ... Read More

In order to match the phone using regular expression, we use the matches method in Java. The java.lang.String.matches() method returns a boolean value which depends on the matching of the String with the regular expression.Declaration − The java.lang.String.matches() method is declared as follows −public boolean matches(String regex)Let us see a ... Read More

In order to export preferences to an XML file in Java, we need to use the exportSubtree() method. This method emits an XML document showing all of the preferences contained in this node and all of its descendants. This XML document provides an offline backup of the subtree rooted at ... Read More