Let’s say the following is our Set with string values −Set set = new HashSet(); set.add("Laptop"); set.add("Mobile"); set.add("Tablet"); set.add("LCD"); set.add("LED");Now, let us convert it to List −List list = new ArrayList(set);Following is the program to convert Set to List in Java −Exampleimport java.util.*; import java.util.stream.*; public class Demo {   ... Read More

Let’s say the following is our set of string −Set setStr = new HashSet(Arrays.asList("50", "100", "150", "200", "250", "300", "500"));Now, convert it to set of Integer −Set setInteger = setStr.stream().map(s -> Integer.parseInt(s)).collect(Collectors.toSet());ExampleFollowing is the program to convert set of String to set of Integer in Java −import java.util.*; import java.util.stream.*; ... Read More

Let’s say the following is our Set of Integer −Set setInteger = new HashSet(Arrays.asList(100, 200, 300, 500, 600, 800, 1000));Now, let us convert this to Set of String −Set setStr = setInteger.stream().map(String::valueOf).collect(Collectors.toSet());ExampleFollowing is the program to convert set of Integer to Set of String in Java −import java.util.*; import java.util.stream.*; ... Read More

Let’s say the following is our set of Integer −Set set = new HashSet(Arrays.asList(50, 100, 150, 200, 400, 600, 800, 1000, 1200, 1500));Now, convert it to Array of Integer −int[] arr = set.stream()    .mapToInt(Integer::intValue)    .toArray();ExampleFollowing is the program to convert set of Integer to Array of Integer in ... Read More

Let us first declare and initialize milliseconds value variable −long milliSeconds = 656478;Now, convert Milliseconds to Date format −DateFormat dateFormat = new SimpleDateFormat("dd MMM yyyy HH:mm:ss:SSS Z"); Date date = new Date(milliSeconds);Following is the program to convert Milliseconds to Date Format in Java −Exampleimport java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; public ... Read More

Here’s our List with string values −List myList = Arrays.asList("One", "Two", "Three", "Four", "Five");Now, let us convert this List to Stream −Stream s = myList.stream();Following is the program to convert List to Stream in Java −Exampleimport java.util.*; import java.util.stream.*; import java.util.function.Function; public class Demo {    public static void main(String ... Read More

Here’s our List of String −List listString = Arrays.asList("25", "50", "75", "100", "125", "150");Now, convert the list of string to list of integer −List listInteger = listString.stream().map(Integer::parseInt).collect(Collectors.toList());Following is the program to convert List of String to List of Integer in Java −Exampleimport java.util.*; import java.util.stream.*; import java.util.function.*; public class Demo ... Read More

Here’s our List of Integer −List listInteger = Arrays.asList(25, 50, 75, 100, 125, 150);Now, convert List of Integer to List of String −List listString = listInteger.stream()    .map(s -> String.valueOf(s))    .collect(Collectors.toList());Following is the program to convert List of Integer to List of String in Java −Exampleimport java.util.*; import java.util.stream.*; ... Read More

The contains() function of the Ints class is used to check whether an element is present in the array or not.Following is the syntax −public static boolean contains(int[] arr, int target)Here, arr is the array wherein the element is to be checked. The target is the element to be checked.Following ... Read More

The concat() function in Ints class is used to concatenate the arrays passed as parameter. The syntax is as follows −public static int[] concat(int[]... arr)Here, parameter arr is zero or more integer arrays.Let us see an example −Exampleimport com.google.common.primitives.Ints; import java.util.*; class Demo {    public static void main(String[] args) ... Read More