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Java Articles
Page 271 of 450
How To Check Whether a Number is a Spy Number or Not in Java?
A number is said to be a Spy number, if the sum of the digits of the given number is equal to the product of the digits of the given number. For more clarification, we have to first calculate the sum of the digits of the given number. After that we have to calculate the product of the digits of the given number. Then we have to compare both the sum value and product value, if they are the same then the given number is a spy number otherwise it is not a spy number. In this article, we will ...
Read MoreHow To Check Whether a Number is a Special Number or Not in Java?
A number is said to be a Special number, if the sum of factorials of the input number’s every digit is equal to the same input number. For more clarification, we have to find all the factors of every digit of the given number. After that we have to calculate the sum of those factorials. Then we have to compare both the sum value and input number, if they are the same then the given number is a special number otherwise it is not a special number. In this article, we will see how to check if a number is ...
Read MoreHow to Calculate Area of Enneagon in Java?
An enneagon refers to a polygon with 9 sides with 9 internal angles. Where all the sides of the polygon are equal it is called a regular enneagon which has an internal angle of 140 degrees, and the sum of all internal angles are 1260 degrees. An enneagon is also referred to as Nonagon. Area of enneagon can be calculated by using When Length of Side (s) is given Area = 6.1818 * (s * s) When circumradius (r) is given Area = 2.8925 * (r * r) When apothem (a) is given Area = 3.2757 * (a ...
Read MoreWhat is execution engine in JAVA?
Execution Engine in Java is the core component of the JVM (java virtual machine) which communicates with different memory areas of the JVM. This component is used to execute the bytecode that is assigned to the runtime data areas via the classloader. In addition to this, each java Class file is executed through the execution engine, and each thread that is present in a running application is a distinct instance of the virtual machine’s execution engine. Hence, by reading this article, you will understand the execution engine in more detail, but before that, let’s comprehend what Java Virtual Machine is. ...
Read MoreCountDownLatch in Java
For a concurrent execution, CountDownLatch in Java is an important class that ensures one or more threads are in the queue for other threads to complete their set of operations. To better understand CountDownLatch in Java, in this article, you will learn the working of CountDownLatch with an example and methods of CountDownLatch. CountDownLatch in Java and its Working Process Based on the count value, the CountDownLatch is used for several purposes, which are as follows − When we begin the CountDownlatch with count value 1, it will simply work as an on/off latch or gate. On the other ...
Read MoreWhat is an I/O filter in Java?
This article will help you understand what I/O filter in Java is. The Java I/O Filter The Java I/O Filter is inside java.io package. It provides sets of input and output streams used for reading and writing data to input and output sources. There are different types of classes in java.io, naming Input Stream, Output Stream, etc. Some of the important types are discussed below − Input Stream The InputStream class of java.io is an abstract superclass which reads data from an input source. The source can be a file, a string, or anything that can contain data. This class ...
Read MoreWhat are the key features of Java?
This article will help you understand what the key features of Java Programming language are. The Key features of Java Programming Language are − Java is Easy to Understand Java’s base is similar to that of C and C++ languages and it includes many important features of these languages. It removes many drawbacks and complexities of C or C++. So if one has good understanding of either C or C++, then Java language will be very familiar and easily understandable. Java is an object oriented programming language Object Oriented Programming (OOP) is an approach to standardize the programs by creating ...
Read MoreWhat is dot operator in Java?
This article will help you understand what a dot operator in Java Programming language is. Before jumping into Dot Operator, let us revise about Operators. OPERATORS In computer programming we often need to perform some arithmetical or logical operations. In such circumstances, we need operators to perform these tasks. Thus, an Operator is basically a symbol or token, which performs arithmetical or logical operations and gives us meaningful result. The values involved in the operation are called Operands. Here is a basic Pictorial representation of Operators. Now, let us discuss the types of Operators available. TYPES OF OPERATORS There ...
Read MoreWhat are various Inheritance mapping strategies available in Hibernate?
There are three types of inheritance mapping strategies − Table per class hierarchy Table per concrete class Table per subclassIn this article, we will discuss table per class hierarchy. Table per class hierarchy In this, only a single table is created for inheritance mapping. Disadvantages of this approach is that a lot of null values gets stored in the table. @Inheritance(strategy=InheritanceType.SINGLE_TABLE), @DiscriminatorColumn and @DiscriminatorValue are the annotations used in this strategy. @DiscriminatorColumn is used to create an additional column which is used to identify the hierarchy classes. Consider the following example to understand this − Steps ...
Read MoreHow to Execute Batch Insert Update in Hibernate?
In this article, we will see how we can execute batch insert/update in hibernate. Whenever we execute a sql statement, we do it by making a network call to the database. Now, if we have to insert 10 entries to our database table, then we have to make 10 network calls. Instead we can optimize our network calls by using batching. Batching allows us to execute a group of SQL statements in a single network call. To understand and implement this, let us define our entities − @Entity public class Parent { @Id @GeneratedValue(strategy ...
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