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The join() method of Ints class returns a string containing the supplied int values separated by separator. The syntax is as follows −public static String join(String separator, int[] arr)Here, separator parameter is something that should appear between consecutive values, whereas arr is an array of int values.Let us first see an example −Exampleimport com.google.common.primitives.Ints; class Demo { public static void main(String[] args) { int[] myArr = { 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 }; System.out.println(Ints.join("-", myArr)); int index = Ints.indexOf(myArr, 40); if ... Read More
The indexOf() method of the Ints class returns the index of the first appearance of the value target in array. The syntax is as follows −public static int indexOf(int[] arr, int target)Here, parameter arr is an array of int values and target is the value to be checked for first appearance.Let us now see an example −Exampleimport com.google.common.primitives.Ints; class Demo { public static void main(String[] args) { int[] arr = { 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 }; int index = Ints.indexOf(arr, 40); if (index != ... Read More
Let’s say the following is our stream −Stream stream = Stream.of(50, 100, 200, 400, 800, 1000, 2000);Now, convert stream to an array using toArray() −Object[] objArr = stream.toArray(Object[] ::new);Following is the program to convert Stream to an Array in Java −Exampleimport java.util.*; import java.util.stream.*; import java.util.function.Function; public class Demo { public static void main(String args[]) { Stream stream = Stream.of(50, 100, 200, 400, 800, 1000, 2000); Object[] objArr = stream.toArray(Object[] ::new); System.out.println("Array = "+ Arrays.toString(objArr)); } }OutputArray = [50, 100, 200, 400, 800, 1000, 2000]
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 { public static void main(String args[]) { Set set = new HashSet(); set.add("Laptop"); set.add("Mobile"); set.add("Tablet"); set.add("LCD"); set.add("LED"); set.add("Desktop"); System.out.println("Set = " + set); List ... 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.*; public class Demo { public static void main(String args[]) { Set setStr = new HashSet(Arrays.asList("50", "100", "150", "200", "250", "300", "500")); System.out.println("Set (String) = " + setStr); Set setInteger = setStr.stream().map(s -> Integer.parseInt(s)) .collect(Collectors.toSet()); ... 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.*; import java.util.function.Function; public class Demo { public static void main(String args[]) { Set setInteger = new HashSet(Arrays.asList(100, 200, 300, 500, 600, 800, 1000)); System.out.println("Set = " + setInteger); Set setStr = setInteger.stream().map(String::valueOf).collect(Collectors.toSet()); System.out.println("New Set (String) = " ... 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 Java −import java.util.*; import java.util.stream.*; import java.util.function.Function; public class Demo { public static void main(String args[]) { Set set = new HashSet(Arrays.asList(50, 100, 150, 200, 400, 600, 800, 1000, 1200, 1500)); System.out.println("Set = " + set); int[] arr = set.stream().mapToInt(Integer::intValue).toArray(); System.out.println("Array = "+ Arrays.toString(arr)); } }OutputSet = [400, 800, 1200, 50, 100, 150, 200, 600, 1000, 1500] Array = [400, 800, 1200, 50, 100, 150, 200, 600, 1000, 1500]
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 class Demo { public static void main(String args[]) { long milliSeconds = 656478; DateFormat dateFormat = new SimpleDateFormat("dd MMM yyyy HH:mm:ss:SSS Z"); Date date = new Date(milliSeconds); System.out.println(dateFormat.format(date)); } }Output01 Jan 1970 00:10:56:478 +0000
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 args[]) { List myList = Arrays.asList("One", "Two", "Three", "Four", "Five"); System.out.println("List: " + myList); Stream s = myList.stream(); System.out.println("Stream (List to Stream) = " + Arrays.toString(s.toArray())); } }OutputList: [One, Two, Three, Four, Five] Stream (List to Stream) ... 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 { public static void main(String[] args) { List listString = Arrays.asList("25", "50", "75", "100", "125", "150"); System.out.println("List of String = " + listString); List listInteger = listString.stream().map(Integer::parseInt) .collect(Collectors.toList()); System.out.println("List of Integer (converted from ... Read More