A read-only int buffer can be created using the contents of a buffer with the method asReadOnlyBuffer() in the class java.nio.IntBuffer. The new buffer cannot have any modifications as it is a read-only buffer. However, the capacity, positions, limits etc. of the new buffer are the same as the previous buffer.A program that demonstrates this is given as follows −Example Live Demoimport java.nio.*; import java.util.*; public class Demo {    public static void main(String[] args) {       int n = 5;       try {          IntBuffer buffer = IntBuffer.allocate(5);          buffer.put(8); ... Read More

Details about HashMap and WeakHashMap that help to differentiate them are given as follows −HashMap in JavaA HashMap has key-value pairs i.e. keys that are associated with the values and the keys are in arbitrary order. A HashMap object that is specified as a key is not eligible for garbage collection. This means that the HashMap has dominance over the garbage collector.A program that demonstrates this is given as follows −Example Live Demoimport java.util.*; class A {    public String toString() {       return "A ";    }    public void finalize() {       System.out.println("Finalize method");   ... Read More

Details about TreeMap, HashMap and LinkedHashMap that help to differentiate them are given as follows −TreeMap in JavaA TreeMap in Java is implemented using a Red-Black trees. It has key-value pairs i.e. keys that are associated with the values and the keys are ordered. A TreeMap can only have unique elements and cannot have a null key but have null elements.A program that demonstrates this is given as follows −Example Live Demoimport java.util.*; import java.lang.*; import java.io.*; public class Demo {    public static void main (String[] args) {       TreeMap tMap = new TreeMap();       int[] ... Read More

A thread safe version of the set is the CopyOnWriteArraySet in Java. This set uses an CopyOnWriteArrayList internally for the set operations. The CopyOnWriteArraySet was introduced by the JDK 1.5.A program that demonstrates this is given as follows −Example Live Demoimport java.util.concurrent.*; public class Demo extends Thread {    public static void main(String[] args) {       CopyOnWriteArraySet cowArraySet = new CopyOnWriteArraySet();       cowArraySet.add("Amy");       cowArraySet.add("John");       cowArraySet.add("Bob");       cowArraySet.add("Clara");       cowArraySet.add("Peter");       System.out.println(cowArraySet);    } }The output of the above program is as follows −Output[Amy, John, Bob, ... Read More

The ConcurrentSkipListSet has elements that are sorted by default. Also, its implementation is based on the ConcurrentSkipListMap. The ConcurrentSkipListSet class also implements the Collection interface as well as the AbstractSet class. It is a part of the Java Collection Framework.A program that demonstrates this is given as follows −Example Live Demoimport java.util.concurrent.ConcurrentSkipListSet; public class Demo {    public static void main(String[] args) {       ConcurrentSkipListSet csls = new ConcurrentSkipListSet();       csls.add(7);       csls.add(4);       csls.add(1);       csls.add(9);       csls.add(3);       System.out.println("The elements in ConcurrentSkipListSet are: " + ... Read More

The LinkedBlockingDeque Class in Java has a blockingdeque that is optionally bounded and based on linked nodes. This class implements the Collection interface as well as the AbstractQueue class. It is a part of the Java Collection Framework.A program that demonstrates this is given as follows −Example Live Demoimport java.util.concurrent.LinkedBlockingDeque; public class Demo {    public static void main(String[] args) {       LinkedBlockingDeque lbDeque = new LinkedBlockingDeque();       lbDeque.add("James");       lbDeque.add("May");       lbDeque.add("John");       lbDeque.add("Sara");       lbDeque.add("Anne");       System.out.println("Size of LinkedBlockingDeque is: " + lbDeque.size());     ... Read More

The ConcurrentLinkedDeque Class in Java implements a deque and used a concurrent linked list for help. This class implements the Collection interface as well as the AbstractCollection class. It is a part of the Java Collection Framework.A program that demonstrates this is given as follows −Example Live Demoimport java.util.concurrent.*; public class Demo {    public static void main(String[] args) {       ConcurrentLinkedDeque clDeque = new ConcurrentLinkedDeque();       clDeque.add("James");       clDeque.add("May");       clDeque.add("John");       clDeque.add("Sara");       clDeque.add("Anne");       System.out.println("The elements in ConcurrentLinkedDeque are: " + clDeque);    } ... Read More

The PriorityBlockingQueue Class in Java has a blocking queue that has unbounded functionality and is based on the class PriorityQueue with the same ordering rules. The PriorityBlockingQueue Class is a part of the Java Collection Framework.A program that demonstrates this is given as follows −Example Live Demoimport java.util.concurrent.PriorityBlockingQueue; public class Demo {    public static void main(String[] args) {       PriorityBlockingQueue pbQueue = new PriorityBlockingQueue();       pbQueue.add("James");       pbQueue.add("May");       pbQueue.add("John");       pbQueue.add("Sara");       pbQueue.add("Anne");       System.out.println("The elements in PriorityBlockingQueue are: " + pbQueue);    } }The ... Read More

The LinkedTransferQueue Class in Java has a transfer queue that has unbounded functionality and is based on linked nodes. It uses FIFO for ordering elements. This class implements the Collection interface as well as the AbstractQueue class. It is a part of the Java Collection Framework.A program that demonstrates this is given as follows −Example Live Demoimport java.util.concurrent.LinkedTransferQueue; public class Demo {    public static void main(String[] args) throws InterruptedException {       LinkedTransferQueue ltQueue = new LinkedTransferQueue();       ltQueue.add("Amy");       ltQueue.add("John");       ltQueue.add("May");       ltQueue.add("Harry");       ltQueue.add("Anne");     ... Read More

The LinkedBlockingQueue Class in Java has a blocking queue that is optionally bounded and based on linked nodes. This means that if the capacity is provided then the LinkedBlockingQueue is bound, otherwise it is not bound. Also, FIFO for ordering elements.A program that demonstrates this is given as follows −Example Live Demoimport java.util.concurrent.LinkedBlockingQueue; public class Demo {    public static void main(String[] args) {       LinkedBlockingQueue lbQueue = new LinkedBlockingQueue();       lbQueue.add("Amy");       lbQueue.add("John");       lbQueue.add("May");       lbQueue.add("Harry");       lbQueue.add("Anne");       System.out.println("The elements in LinkedBlockingQueue are: " ... Read More