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Articles on Trending Technologies
Technical articles with clear explanations and examples
Class that contains a String instance variable and methods to set and get its value in Java
A class declaration can contain a String instance and methods to set and get its value in Java.A program that demonstrates this is given as follows:Exampleclass Name { private String name; public void setName(String n) { name = n; } public String getName() { return name; } } public class Demo { public static void main(String[] args) { Name n = new Name(); n.setName("John Smith"); System.out.println("The name is: " + n.getName()); } }OutputThe name is: John SmithNow let ...
Read MoreIntStream mapToDouble() method in Java
The mapToDouble() method returns a DoubleStream consisting of the results of applying the given function to the elements of this stream.The syntax is as follows.DoubleStream mapToDouble(IntToDoubleFunction mapper)Here, the parameter mapper is the stateless function applied to each element.Create an IntStream with some elements.IntStream intStream = IntStream.of(5, 20, 25, 45, 60, 75, 85, 90);Now, use the mapToDouble() method to return a DoubleStream.DoubleStream doubleStream = intStream.mapToDouble(val -> (double) val);The following is an example to implement IntStream mapToDouble() method in Java.Exampleimport java.util.*; import java.util.stream.IntStream; import java.util.stream.DoubleStream; public class Demo { public static void main(String[] args) { IntStream intStream = ...
Read MoreC++ Program to Check Whether an Input Binary Tree is the Sub Tree of the Binary Tree
A binary tree is a tree data structure in which each node has at most two children, which are defined as left child and right child.AlgorithmBegin function identical(): Take two nodes r1 and r2 as parameter. If r1 and r2 is NULL then Return true. If r1 or r2 is NULL then Return false. Return (r1->d is equal to r2->d and Call function Identical(r1->l, r2->l) and Call functions Identical(r1->r, r2->r) ); ...
Read MoreHow to generate a random BigInteger value in Java?
To generate random BigInteger in Java, let us first set a min and max value −BigInteger maxLimit = new BigInteger("5000000000000"); BigInteger minLimit = new BigInteger("25000000000");Now, subtract the min and max −BigInteger bigInteger = maxLimit.subtract(minLimit); Declare a Random object and find the length of the maxLimit: Random randNum = new Random(); int len = maxLimit.bitLength();Now, set a new B integer with the length and the random object created above.Exampleimport java.math.BigInteger; import java.util.Random; public class Demo { public static void main(String[] args) { BigInteger maxLimit = new BigInteger("5000000000000"); BigInteger minLimit = new BigInteger("25000000000"); ...
Read MoreRemove a value from Java LinkedHashMap
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 −Exampleimport java.util.*; public class Demo { public static void main(String[] args) { LinkedHashMap l = new LinkedHashMap(); ...
Read MoreWhat is Default access level in Java?
The default access level is available when no access level is specified. All the classes, data members, methods etc. which have the default access level can only be accessed inside the same package.A program that demonstrates the default access level in Java is given as follows:Exampleclass Employee { int empno; String name; void insert(int e, String n) { empno = e; name = n; } void display() { System.out.println("Employee Number: " + empno); System.out.println("Name: " + name); } } public class Demo ...
Read MoreWhy do we use import statement in Java? Where it should be included in the class?
The import statement can be used to import an entire package or sometimes import certain classes and interfaces inside the package. The import statement is written before the class definition and after the package statement(if there is any). Also, the import statement is optional.A program that demonstrates this in Java is given as follows:Exampleimport java.util.LinkedList; public class Demo { public static void main(String[] args) { LinkedList l = new LinkedList(); l.add("Apple"); l.add("Mango"); l.add("Cherry"); l.add("Orange"); l.add("Pear"); System.out.println("The LinkedList ...
Read MoreC++ Program to Construct an Expression Tree for a Postfix Expression
An expression tree is basically a binary tree which is used to represent expressions. In expression tree, nodes correspond to the operator and each leaf node corresponds to the operand. This is a C++ program to construct an expression tree for a postfix Expression in inorder, preorder and postorder traversals.AlgorithmBegin Function r() has a character variable as parameter. If the characters are + or - or * or / then Return will be -1 If the characters are from A to Z then Return will ...
Read MoreHow to convert Integer array list to float array in Java?
To convert integer array list to float array, let us first create an integer array list −ArrayList < Integer > arrList = new ArrayList < Integer > (); arrList.add(25); arrList.add(50); arrList.add(100); arrList.add(200); arrList.add(300); arrList.add(400); arrList.add(500);Now, convert integer array list to float array. We have first set the size to the float array. With that, each and every value of the integer array is assigned to the float array −final float[] arr = new float[arrList.size()]; int index = 0; for (final Integer value: arrList) { arr[index++] = value; }Exampleimport java.util.ArrayList; public class Demo { public static void main(String[] args) ...
Read MorePrint a Vector in a comma-delimited list, in index order and surrounded by square brackets ([]) in Java
A Vector can be printed in a comma-delimited list, in index order and surrounded by square brackets ([]) by simply using System.out.println() along with the Vector object.A program that demonstrates this is given as follows −Exampleimport java.util.Vector; public class Demo { public static void main(String args[]) { Vector vec = new Vector(5); vec.add(4); vec.add(1); vec.add(3); vec.add(9); vec.add(6); System.out.println(vec); } }The output of the above program is as follows −[4, 1, 3, 9, 6]Now let us understand the ...
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