Create a TreeSet and add elements −TreeSet tSet = new TreeSet(); tSet.add("TV"); tSet.add("Radio"); tSet.add("Internet");Iterate through the elements −Iterator i = tSet.iterator(); while(i.hasNext()){ System.out.println(i.next()); }The following is an example to create a TreeSet −Example Live Demoimport java.util.*; public class Demo { public static void main(String args[]){ TreeSet tSet = new TreeSet(); tSet.add("TV"); tSet.add("Radio"); tSet.add("Internet"); Iterator i = tSet.iterator(); while(i.hasNext()){ System.out.println(i.next()); } } }OutputInternet Radio TV

Elements can be filled in a Java long array in a specified range using the java.util.Arrays.fill() method. This method assigns the required long value in the specified range to the long array in Java.The parameters required for the Arrays.fill() method are the array name, the index of the first element to be filled(inclusive), the index of the last element to be filled(exclusive) and the value that is to be stored in the array elements.A program that demonstrates this is given as follows −Example Live Demoimport java.util.Arrays; public class Demo { public static void main(String[] argv) throws Exception { ... Read More

Use the clear() method to remove all the values from LinkedHashMap in Java.Create a LinkedHashMap and add some elements −LinkedHashMap l = new LinkedHashMap(); l.put("1", "Jack"); l.put("2", "Tom"); l.put("3", "Jimmy"); l.put("4", "Morgan"); l.put("5", "Tim"); l.put("6", "Brad");Now, let us remove all the values −l.clear();The following is an example to remove all values from LinkedHashMap −Example Live Demoimport java.util.*; public class Demo { public static void main(String[] args) { LinkedHashMap l = new LinkedHashMap(); l.put("1", "Jack"); l.put("2", "Tom"); ... Read More

First, create a LinkedHashSet and add elements −LinkedHashSet l = new LinkedHashSet(); l.add(new String("1")); l.add(new String("2")); l.add(new String("3")); l.add(new String("4")); l.add(new String("5")); l.add(new String("6")); l.add(new String("7"));Now, copy it to an object array like this −// copying Object[] arr = l.toArray();The following is an example to copy all elements of a LinkedHashSet to an object array −Example Live Demoimport java.util.*; public class Demo { public static void main(String[] args) { LinkedHashSet l = new LinkedHashSet(); l.add(new String("1")); l.add(new String("2")); ... Read More

LinkedHashMap is a class in Java that implements the Map interface. It uses a doubly linked list to maintain the insertion order of elements. So, when we loop through a LinkedHashMap, the elements will be returned in the order we had inserted them. The given task is to check if a particular value exists in a LinkedHashMap in Java. Let's look at some scenarios to understand the problem better: Scenario Input: {1=Mikasa, 2=Eren, 3=Reiner}, Value to check: Mikasa Output: Value Exists Explanation: The LinkedHashMap has the value that we are looking for. Checking if a Value Exists in LinkedHashMapThe following ... Read More

Elements can be filled in a Java double array in a specified range using the java.util.Arrays.fill() method. This method assigns the required double value in the specified range to the double array in Java.The parameters required for the Arrays.fill() method are the array name, the index of the first element to be filled(inclusive), the index of the last element to be filled(exclusive) and the value that is to be stored in the array elements.A program that demonstrates this is given as follows −Example Live Demoimport java.util.Arrays; public class Demo { public static void main(String[] argv) throws Exception { ... Read More

Use the remove() method to remove a single value from LinkedHashMap −At first, create a LinkedHashMap and add some elements −LinkedHashMap l = new LinkedHashMap(); l.put("1", "Jack"); l.put("2", "Tom"); l.put("3", "Jimmy"); l.put("4", "Morgan"); l.put("5", "Tim"); l.put("6", "Brad");Now, let’s say you need to remove the element 2 from the LinkedHashMap. For that, use the remove() method −Object ob = l.remove("2");The following is an example to remove a value from LinkedHashMap in Java −Example Live Demoimport java.util.*; public class Demo { public static void main(String[] args) { LinkedHashMap l = new LinkedHashMap(); ... Read More

LinkedHashMap is a data structure in Java that is part of the Java Collections Framework. It is very similar to HashMap.It stores key-value pairs, where each key is unique, and it allows null values, but allows only one null key. The main difference is that the LinkedHashMap returns the elements in the order they were inserted. This is because it maintains a linked list with entries in the map, which helps it to retain the insertion order of the elements. Our task is to check if a particular key exists in a LinkedHashMap in Java. Scenario 1 Following is a ... Read More

To clone the IdentityHashMap in Java, use the clone() method.Create an IdentityHashMap and add elements to it −IdentityHashMap m = new IdentityHashMap(); m.put("1", 100); m.put("2", 200); m.put("3", 300); m.put("4", 150); m.put("5", 110);Now get the size of the IdentityHashMap −m.size()The following is an example to clone IdentityHashMap in Java −Example Live Demoimport java.util.*; public class Demo {    public static void main(String[] args) {       IdentityHashMap m = new IdentityHashMap();       m.put("1", 100);       m.put("2", 200);       m.put("3", 300);       m.put("4", 150);       m.put("5", 110);       m.put("6", 50); ... Read More

To remove all the elements from LinkedHashSet in Java, use the clear() method.The following is an example to declare LinkedHashSet and add elements to it −LinkedHashSet hashSet = new LinkedHashSet(); hashSet.add(10); hashSet.add(20); hashSet.add(30); hashSet.add(40); hashSet.add(50); hashSet.add(60);Use the clear() method to remove all elements −hashSet.clear();The following is an example −Example Live Demoimport java.util.LinkedHashSet; public class Demo { public static void main(String[] args) { LinkedHashSet hashSet = new LinkedHashSet(); hashSet.add(10); hashSet.add(20); hashSet.add(30); ... Read More