Knowledge Factory

In this section, we will show you how to  convert a List of String to a comma separated String in Java. 1. List 1.1 Using String.join() join (CharSequence delimiter, Iterable<? extends CharSequence> elements) : This method is useful when we have to join iterable elements. Some of the common Iterables are – List, Set, Queue, and Stack. import java.util.Arrays ; import java.util.List ; public class Main { public static void main ( String [] args) { List < String > list = Arrays . asList ( "Java" , "Kotlin" , "Python" , "C" ); String result = String . join ( "," , list ); System . out .println( result ); } } Console Output: Java,Kotlin,Python,C 1.2 Stream Collectors.joining() joining(CharSequence delimiter) :We pass a delimiter to get back a Collector, which concatenates the elements separated by the specified delimiter. import java.util.Arrays ; import java.util.List ; import jav

In this section, we will show you how to sort list using stream.sorted() in Java 8. 1. List 1.1 Sort a List in natural order. import java.util.Arrays ; import java.util.Comparator ; import java.util.List ; import java.util.stream.Collectors ; public class Main { public static void main ( String [] args) { List < String > list = Arrays . asList ( "8" , "B" , "A" , "1" , "Z" , "Y" , "2" , "b" , "d" ); List < String > sortedList1 = list .stream() .sorted( Comparator . naturalOrder ()) .collect( Collectors . toList ()); System . out .println( sortedList1 ); List < String > sortedList2 = list .stream() .sorted((o1,o2)-> o1.compareTo(o2)) .collect( Collectors . toList ()); System . out .println( sortedList2 ); List < String > sortedList3 = list .stream(). sorted().

In this section, we will show you four different ways to  capitalize the first letter of each word in a String using Java. Following ways can be used to capitalize the first letter of each word in a String in Java : By using Java 8 Stream By using  StringTokenizer By using Pattern.compile() and replaceAll method By using Apache Commons Text Example 1: Using Java 8 Stream First split the string into an array using the split() method. Then array is passed to Arrays.stream() as a parameter that turns it into a Stream object. Then, we use the map() method from streams to capitalize each word and finally collect all words again and join them into one sentence. import java.util.Arrays ; import java.util.stream.Collectors ; public class Main { // Driver code public static void main ( String [] args) { String str = "how are you" ; System . out .println( "Input => " + str ); String result = capitalize ( str ); System . out .println(