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Articles on Trending Technologies
Technical articles with clear explanations and examples
Can we declare an abstract method final or static in java?
A method which does not have body is known as abstract method. It contains only method signature with a semi colon and, an abstract keyword before it.public abstract myMethod();To use an abstract method, you need to inherit it by extending its class and provide implementation to it.Declaring abstract method staticIf you declare a method in a class abstract to use it, you must override this method in the subclass. But, overriding is not possible with static methods. Therefore, an abstract method cannot be static.If you still, try to declare an abstract method static a compile time error is generated saying ...
Read MoreJava Program to create an array with randomly shuffled numbers in a given range
For randomly shuffled numbers, let us create an integer list and add some numbers −List < Integer > list = new ArrayList < Integer > (); list.add(10); list.add(50); list.add(100); list.add(150); list.add(200);Now, shuffle the elements for random values −Collections.shuffle(list);Create an int array with the same number of elements in the above list −intlen = list.size(); int[] res = newint[len];Set the shuffled values in the new array −for (inti = 0; i < len; i++) { res[i] = list.get(i); }Exampleimport java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.List; public class Demo { public static void main(String args[]) { ...
Read MoreCan a constructor throw an exception in Java?
Yes, constructors are allowed to throw an exception in Java.A Constructor is a special type of a method that is used to initialize the object and it is used to create an object of a class using the new keyword, where an object is also known as an Instance of a class. Each object of a class will have its own state (Instance variables) and access to methods of its class.Throw an Exception from a ConstructorA checked exception can be used to indicate a legitimate problem when trying to create an instance, while an unchecked exception typically indicates a bug either in the ...
Read MoreHow to randomize and shuffle array of numbers in Java?
At first, create an integer array −int[] arr = { 20, 40, 60, 80, 100, 120, 140, 160, 180, 200};Now, create a Random class object −Random rand = new Random();Loop until the length of the array and shuffle the elements −for (int i = 0; i < arr.length; ++i) { int index = rand.nextInt(arr.length - i); int tmp = arr[arr.length - 1 - i]; arr[arr.length - 1 - i] = arr[index]; arr[index] = tmp; }Exampleimport java.util.Arrays; import java.util.Random; public class Demo { public static void main(String[] args) { int[] arr = { ...
Read MoreLongStream limit() method in Java
The limit() method of the LongStream class in Java returns a stream consisting of the elements of this stream, truncated to be no longer than max in length. Here, max is the parameter of the method.The syntax is as follows.LongStream limit(long max)Here, max is the number of elements the stream should be limited to.To use the LongStream class in Java, import the following package.import java.util.stream.LongStream;Create a LongStream and add elements.LongStream longStream = LongStream.of(2000L, 35000L, 45000L, 50500L, 65000L, 72000L);Now, let’s say you only want to return 4 elements. For that, use the limit as 4.longStream.limit(4).The following is an example to implement ...
Read MoreHow to shuffle an array in Java?
Declare a string array and add elements in the form of letters −String[] letters = { "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };Convert the above array to list −Listlist = Arrays.asList(letters);Now, create a shuffled array using the Random class object and generate the random letters with nextInt() −int len = list.size(); System.out.println("Shuffled array..."); for (int i = 0; i < letters.length; i++) { int index = new Random().nextInt(len); String shuffle = list.get(index); System.out.println(shuffle); }Exampleimport java.util.Arrays; import java.util.List; import java.util.Random; public class Demo { public static void main(String[] args) { ...
Read MoreJava Program to shift array elements to the right
Let us first create an int array −int[] arr = { 10, 20, 30, 40, 50, 60, 70, 80, 90 };Now, shift array elements to the right with arraycopy() and placing the elements correctly so that it gets shifted to the right −System.arraycopy(arr, 0, arr, 1, arr.length - 1);Exampleimport java.util.Arrays; public class Demo { public static void main(String[] argv) throws Exception { int[] arr = { 10, 20, 30, 40, 50, 60, 70, 80, 90 }; System.out.println("Initial array..."+Arrays.toString(arr)); System.arraycopy(arr, 0, arr, 1, arr.length - 1); System.out.println("Array after shifting to the right..."); System.out.println(Arrays.toString(arr)); } }OutputInitial array... [10, 20, 30, 40, 50, 60, 70, 80, 90] Array after shifting to the right... [10, 10, 20, 30, 40, 50, 60, 70, 80]
Read MoreWhat are the main shift operators provided by Java? Explain with an example?
Java provides three shift operators namely −Binary Left Shift Operator. The left operands value is moved left by the number of bits specified by the right operand.Binary Right Shift Operator. The left operands value is moved right by the number of bits specified by the right operand.Shift right zero fill operator. The left operands value is moved right by the number of bits specified by the right operand and shifted values are filled up with zeros.Examplepublic class Test { public static void main(String args[]) { int a = 60;/* 60 = 0011 1100 */ ...
Read MoreLongStream sequential() method in Java
The sequential() method of the LongStream class in Java returns an equivalent stream that is sequential.The syntax is as follows −LongStream sequential()To use the LongStream class in Java, import the following package −import java.util.stream.LongStream;Create a LongStream and add some elements −LongStream longStream = LongStream.of(50L, 70L, 100L, 150L, 200L, 300L);Now, return an equivalent stream that is sequential −LongStream res = longStream.sequential(); The following is an example to implement LongStream sequential() method in Java −Exampleimport java.util.stream.LongStream; public class Demo { public static void main(String[] args) { LongStream longStream = LongStream.of(50L, 70L, 100L, 150L, ...
Read MoreThe containsAll() method of AbstractSequentialList in Java
The containsAll() method of the AbstractSequentialList checks for all the elements in this collection. It returns TRUE if all this collection contains all the elements in the specified collection i.e. if the two collections are same.The syntax is as follows:public boolean containsAll(Collection c)Here, c is the collection to be checkedTo work with the AbstractSequentialList class in Java, you need to import the following package:import java.util.AbstractSequentialList;The following is an example to implement AbstractSequentialList containsAll() method in Java:Exampleimport java.util.LinkedList; import java.util.AbstractSequentialList; public class Demo { public static void main(String[] args) { AbstractSequentialList absSequential = new LinkedList(); ...
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