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Articles on Trending Technologies
Technical articles with clear explanations and examples
How can we convert character array to a Reader in Java?
Converting a character array to a reader in Java means treating the array as a stream of characters to be read sequentially. Let's quickly learn about character array and its creation in Java: In Java, a character array is an array that holds elements of only char type, and it is also used to store a sequence of characters. Following is the syntax to define a character array in Java: char char_array_name[] = {'char1', 'char2', 'char3'....} or char char_array_name[] = new char[size]; Here, char_array_name: The name of the character array. ...
Read MoreCan a constructor be synchronized in Java?
No, a constructor cannot be synchronized in Java. If you try to use the synchronized keyword before a constructor, it may throw a compile-time error in the IDE. Synchronization is a mechanism used to control the access of multiple threads to any shared resource. When multiple threads access any shared resources, the synchronization prevents data corruption by coordinating access, avoiding race conditions (i.e., occurs when multiple threads concurrently access and modify shared data), and ensuring that operations are performed atomically. The JVM ensures that only one thread can invoke a constructor call at a given point in time. That is ...
Read MoreCan we define a package after the import statement in Java?
No, we cannot define a package after the import statement in Java. The compiler will throw an error if we try to insert a package after the import statement. A package is a group of similar types of classes, interfaces, and sub-packages. To create a class inside a package, declare the package name in the first statement in our program. Important! If you use the package statement in an online compiler, you may still get an error even if it is defined correctly. This is because many online compilers do not support custom package structures. Example In the following example, ...
Read MoreHow To Check Whether a Number is a Narcissistic Number or Not in Java?
What is a Narcissistic Number? A number is said to be a Narcissistic number, only if the addition (or sum) of the value of each digit raised to the power of the total number of digits available in the original number is equal to the original number. Examples of narcissistic numbers, such as 153, 1634, 54748, etc. All single-digit numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) are Narcissistic numbers because the power of 1 of any digit will be the digit itself. The following input and output scenarios will help you understand the problem and calculation ...
Read MoreCompiling a C++ program with GCC
To compile a C++ program with GCC, we need to download GCC or install the g++ compiler on our system. Otherwise, you will not be able to compile C++ code using GCC. What is GCC? The GCC is a tool chain that compiles code. It stands for GNU Compiler Collection, which was developed by the GNU project. The GCC supports various programming languages such as C, C++, Go, etc. Specific to the C++ language, the GCC provides the g++ compiler, which is developed or designed to compile the C++ source code into executable programs. Note: When the C++ program compiles ...
Read MoreWhat is a Type-safe Enum in Java?
In Java, an enum is a special class that represents a "group of constants" that cannot be changed, just like a "final variables". Java provides an enum keyword to create an enum, and inside the class, the constants are written in uppercase letters and separated by commas (, ). Syntax to create an enum in Java: enum EnumName { CONST1, CONST2, CONST3 // ... } Here, enum: A predefined keyword used to define an enum. EnumName: The name ...
Read MoreCan we synchronize a run() method in Java?
Yes, we can synchronize a run() method in Java using the synchronized keyword before this method. If this method is synchronized, only one thread can execute this on a given instance of the object at any point in time. Here is a code snippet that shows how to define the run() method as synchronized: @Override synchronized run(){ //code implementation } Here, the @Override annotation specifies that the run() method overrides a method from the Runnable interface, and synchronized is a reserved keyword in Java used to define a method or block as synchronized. Synchronization of a run() ...
Read More132 Pattern in C++
The 132 pattern indicates that, as the digits in "132" in any given value, the middle element should be greater than the last and first elements. Similarly, the last element must be greater than the first element. To check 132 patterns in C++, we will use the Array data structure. We have given an array nums[] of size S. Our task is to check whether the array elements at indices i, j, and k are such that i < j < k and nums[j] < nums[k] and nums[i] < nums[k]. If any three elements at positions i < j < k ...
Read MoreHow do we create a string from the contents of a file in java?
We can use the method below to read the contents of a file in Java: Using the java.util.Scanner class. Using the java.io.BufferedReader class. Using the java.nio.file.Files class. Using the Scanner class In Java, you can read the contents of a file in several ways. One way is to read it into a string using the java.util.Scanner class, to do so, follow the steps below: Instantiate the Scanner class, with the path of the file to be read, as a parameter to its constructor. Create an empty String buffer. Start a while loop with a condition, if the ...
Read MoreHow do we extract all the words start with a vowel and length equal to n in java?
In this article, we will learn to extract all the words that start with a vowel and have a length equal to n from a given text file or string in Java. We can solve this problem using the following ways: Using the split() method of the String class. Using the StringTokenizer class. Using Regular Expressions. Using the split() method of the String class To extract all the words that start with a vowel and have a length equal to n from a given text file or string in Java, we can use the following steps: The ...
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