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Page 313 of 589
What is the use of the toEpochSecond() method in Java 9?
In this article, we will learn about the use of the toEpochSecond() method in Java 9. First, we will learn about the LocalDate class, its methods, then we will know about the Epoch Time and the toEpochSecond() method with its uses and example in Java. LocalDate Class The LocalDate class is a part of java.time package. LocalDate class represents a date without a time-zone in the ISO-8601 calendar system, such as 2020-10-14. This class represents a date in the format yyyy-MM-dd. The following are some of the common methods of the LocalDate Class getDayOfMonth(): This ...
Read MoreWhen to use the delayedExecutor() method of CompletableFuture in Java 9?
In this article, we will learn to use the delayedExecutor() method of CompletableFuture in Java 9. We're gonna know about the delayedExecutor() method and also the CompletableFuture class, as this method belongs to this class, and we're gonna know the uses of the delayedExecutor() method along with an example. CompletableFuture Class The CompletableFuture Class was introduced in Java 8. CompletableFuture is a class in java.util.concurrent package that implements the Future and CompletionStage Interface. CompletableFuture provides a powerful and flexible way to write asynchronous, non-blocking code. It supports delays and timeouts. The delayedExecutor() Method The delayedExecutor() method has been added ...
Read MoreWhat is the relation between auto and decltype in C++?
The auto and decltype serve different purposes so they don't map one-to-one. The auto is a keyword in C++11 and later that is used for automatic type deduction. The decltype type specifier yields the type of a specified expression. Unlike auto that deduces types based on values being assigned to the variable, decltype deduces the type from an expression passed to it. The value returned by decltype can directly be used to define another variable. The auto follows the rules of template parameter deduction. You can read more about these rule at Template Argument Deduction While decltype has rules it ...
Read MoreHow do I insert all elements from one list into another in Java?
In this article, we will learn how to insert all elements from one list into another in Java. This is a general operation we perform when working with lists while solving problems in Java. We will cover the following methods to insert all elements from one list into another: Using addAll() Method Using For Loop Using Stream API Using ListIterator Using addAll() Method We can add all elements of one list into another list easily using its addAll() method. This method appends all of the elements in the specified collection to the end of this list, in the ...
Read MoreCan we insert null values in a Java list?
Yes, we can insert null values into a list easily using its add() method. In case of List implementation does not support null, then it will thrown a NullPointerException List is an interface in Java that extends the Collection interface and provides a way to store an ordered collection of elements. It allows us to store duplicate elements, and it also maintains the order of insertion. The List interface is implemented by classes such as ArrayList, LinkedList, and Vector. Null Values in a Java List In Java, a List can contain null values. The List interface allows for the insertion of ...
Read MoreWhen can a double-type be preferred over float-type in Java?
In Java, both double and float are data types that are used to declare a variable that can store only decimal values or floating point numbers. For example: 1.2343, 3.343, 24.321234, etc. The double data type is larger in size compared to the float data type. When to Prefer Double Type Over Float Type A double-type is preferred over a float-type if a more precise and accurate result is required. The precision of double-type is up to 15 to 16 decimal points, while the precision of float type is only around 6 to 7 decimal digits. Following are the syntaxes for ...
Read MoreHow To Check Whether a Number is an Empire Number or Not in Java?
What is Empire Number? A number is said to be an Empire number if it is a prime number, and when we reverse that number, we should get another prime number. For example, let's consider the number 17. We know that 17 is a prime number, and if we reverse this number, we get 71, which is also a prime number. Therefore, 17 is known as an empire number. Here are some other examples of prime numbers such as 11, 13, 17, etc. Input & Output Scenarios Below are a few input and output scenarios that help to understand the ...
Read MoreHow to get the parent process of the Process API in Java 9?
In this article, we will learn to get the parent process of the Process API in Java 9. First, we will know about Process API and its methods, after that we will learn about the ProcessHandle interface. Process API In Java, the Process API, we can perform any operation regarding a process. The Process class provides methods for performing input on the processes, performing output to the processes, finding child and parent processes of the currently running process, and destroying the process. The following are some of the common methods of the Process API: destroy(): ...
Read MoreWhen to use the readAllBytes() method of InputStream in Java 9?
In this article, we will learn to use the readAllBytes() method of InputStream in Java 9. We will get to know the readAllBytes() method with its syntax, then we will learn about the InputStream Class with its methods, and lastly, we will learn the use of readAllBytes() with an example What is the readAllBytes() Method? In Java 9, the readAllBytes() method reads all bytes from an InputStream object at once and blocks until all remaining bytes have been read and the end of the stream is detected, or an exception is thrown. It returns a byte array containing the ...
Read MoreHow to get dates using LocalDate.datesUntil() method in Java 9?
In this article, we will learn to get dates using the LocalDate.datesUntil() method in Java 9. We will learn about date ranges, skip or limit results and by using the Period class we will apply the custom steps. What is a LocalDate? LocalDate is a part of java.time package and is an immutable, date-time object, which often represents a date in the "year-month-day" format. For example, the value of "2nd May 2025" could be stored in a LocalDate. The following are the maximum and minimum values of the LocalDate: MAX: The maximum supported LocalDate, '+999999999-12-31'. ...
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