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Stream method of array class introduced in Java 8. Let us see an example wherein we are counting empty strings, eliminating empty strings, getting a list of square of distinct numbers, displaying random numbers, etc −Exampleimport java.util.ArrayList; import java.util.Arrays; import java.util.IntSummaryStatistics; import java.util.List; import java.util.Random; import java.util.stream.Collectors; import java.util.Map; public class Java8Tester { public static void main(String args[]) { System.out.println("Using Java 7: "); // Count empty strings List strings = Arrays.asList("abc", "", "bc", "efg", "abcd", "", "jkl"); System.out.println("List: " +strings); long count = getCountEmptyStringUsingJava7(strings); ... Read More
Let’s say the following is our Iterator with Integer values −Iteratoriterator = Arrays.asList(20, 40, 60, 80, 100, 120, 150, 200).iterator();Now, convert the Iterator to Iterable −Iterableiterable = StreamSupport.stream(Spliterators.spliteratorUnknownSize(iterator, 0),false).collect(Collectors.toList());ExampleFollowing is the program to convert Iterator to Iterable in Java −import java.util.*; import java.util.stream.Collectors; import java.util.stream.StreamSupport; public class Demo { public static void main(String[] args) { Iteratoriterator = Arrays.asList(20, 40, 60, 80, 100, 120, 150, 200).iterator(); Iterableiterable = StreamSupport.stream(Spliterators.spliteratorUnknownSize(iterator, 0), false).collect(Collectors.toList()); System.out.println("Iterable = "); iterable.forEach(System.out::println); } }OutputIterable = 20 40 60 80 100 120 150 200
To show the JavaScript alert box in the middle, you need to use the custom alert box. Under that, style it accordingly and position it to the center. Use the “top” and “left” CSS properties to achieve this. Set them as 50%, but as you can see a button below, use the property to 40% to align it with the button:ExampleLive Demo function functionAlert(msg, myYes) { var confirmBox = $("#confirm"); confirmBox.find(".message").text(msg); ... Read More
You will not be able to change the style of a standard alert box in JavaScript. To change the style, use the following custom alert box. We’re using JavaScript library, jQuery to achive this.ExampleLive Demo function functionAlert(msg, myYes) { var confirmBox = $("#confirm"); confirmBox.find(".message").text(msg); confirmBox.find(".yes").unbind().click(function() { confirmBox.hide(); }); ... Read More
At first, initialize a double value −double val = 978.65;Now, convert the Double to Integer value using intValue() method −Double d = new Double(val); int res = d.intValue();ExampleFollowing is the program to convert Double to Integer in Java −public class Demo { public static void main(String args[]) { double val = 978.65; System.out.println("Double = "+val); Double d = new Double(val); int res = d.intValue(); System.out.println("Double to Integer value = "+res); } }OutputDouble = 978.65 Double to Integer value = 978
At first, set an Interator −Iteratoriterator = Arrays.asList(50, 100, 200, 400, 500, 1000).iterator();Now, we have used stream −Streamstream = convertIterator(iterator);Above, the method convertIterator() is used for conversion. Following is the method −public static Stream convertIterator(Iterator iterator) { return StreamSupport.stream(((Iterable) () -> iterator).spliterator(), false); }ExampleFollowing is the program to convert an Iterator to Stream in Java −import java.util.stream.*; import java.util.*; public class Demo { public static Stream convertIterator(Iterator iterator) { return StreamSupport.stream(((Iterable) () -> iterator).spliterator(), false); } public static void main(String[] args) { Iteratoriterator = Arrays.asList(50, 100, 200, ... Read More
Let us first create a set with string values −Setset = new HashSet(Arrays.asList("One", "Two", "Three", "Four", "Five", "Six"));Now, convert it to a comma separated string using String.join() −String str = String.join(", ", set);ExampleFollowing is the program to convert set of string to a comma separated string in Java −import java.util.*; public class Demo { public static void main(String args[]) { Setset = new HashSet(Arrays.asList("One", "Two", "Three", "Four", "Five", "Six")); System.out.println("Set = " + set); String str = String.join(", ", set); System.out.println("Comma separated String: "+ str); } ... Read More
At first, let’s say the following is our List of String −List myList = new ArrayList(Arrays.asList("One", "Two", "Three", "Four"));Now, convert this to a comma separated string using String.join()String str = String.join(", ", myList);ExampleFollowing is the program to convert List of String to a comma separated String in Java −import java.util.*; public class Demo { public static void main(String args[]) { List myList = new ArrayList(Arrays.asList("One", "Two", "Three", "Four")); System.out.println("List = " + myList); // comma separated String str = String.join(", ", myList); System.out.println("String (Comma ... Read More
At first, let us create a Java Map and initialize −Map map = new HashMap(); map.put(1, "Tom"); map.put(2, "John"); map.put(3, "Kevin"); map.put(4, "Jacob"); map.put(5, "Ryan");Now, convert the Map to List −ArrayList key = new ArrayList(map.keySet()); ArrayList value = new ArrayList(map.values());ExampleFollowing is the program to convert Maps to List in Java −import java.util.HashMap; import java.util.ArrayList; import java.util.Map; public class Demo { public static void main(String args[]) { Map map = new HashMap(); map.put(1, "Tom"); map.put(2, "John"); map.put(3, "Kevin"); map.put(4, "Jacob"); map.put(5, "Ryan"); ... Read More
Let’s say the following is our string −String str = "My String";Now, convert the above to IntStream −IntStream stream = str.chars();ExampleFollowing is the program to convert String to IntStream in Java −import java.util.stream.IntStream; public class Demo { public static void main(String[] args) { String str = "My String"; System.out.println("String: " + str); IntStream stream = str.chars(); System.out.println("IntStream..."); stream.forEach(System.out::println); } }OutputString: My String IntStream... 77 121 32 83 116 114 105 110 103