The double keyword in Java is used to declare a variable of type double, which is a double-precision 64-bit IEEE 754 floating point. The double data type is used to store decimal numbers and is more precise than the float data type. Table of Contents Introduction double Keyword Syntax Understanding double Examples Declaring Double Variables …
The float keyword in Java is used to declare a variable of type float, which is a single-precision 32-bit IEEE 754 floating point. The float data type is used to store decimal numbers, and it is particularly useful when you need to save memory in large arrays of floating point numbers. Table of Contents Introduction …
The permits keyword in Java is used in conjunction with the sealed keyword to specify the classes that are allowed to extend or implement a sealed class or interface. This feature, introduced in Java 17, enables a more controlled and restricted inheritance hierarchy, ensuring that only specified classes or interfaces can be subclasses or implementors …
The extends keyword in Java is used to indicate that a class is inheriting from another class. It establishes an inheritance relationship where a subclass (child class) inherits fields and methods from a superclass (parent class). This mechanism allows for code reuse, method overriding, and polymorphism.
The instanceof keyword in Java is used to test whether an object is an instance of a specific class or interface. It is a binary operator that returns a boolean value: true if the object is an instance of the specified type, and false otherwise.
The record keyword in Java is used to define a special kind of class called a record. Records provide a concise syntax for declaring immutable data carriers with automatically generated methods such as equals(), hashCode(), and toString(), as well as accessor methods for their fields. Records were introduced in Java 14 as a preview feature …
The native keyword in Java is used to declare a method that is implemented in platform-specific code, typically using languages like C or C++. These methods are part of the Java Native Interface (JNI), which allows Java code running in the Java Virtual Machine (JVM) to call and be called by native applications and libraries …
The import keyword in Java is used to bring classes, interfaces, or entire packages into the current file so that their members can be accessed without needing to fully qualify their names. This makes the code more readable and easier to maintain by reducing redundancy.
The strictfp keyword in Java is used to restrict floating-point calculations to ensure consistent and platform-independent results. When a class, method, or interface is declared with strictfp, all floating-point computations within its scope are performed using strict floating-point rules, which adhere to the IEEE 754 standard for floating-point arithmetic.
The transient keyword in Java is used to indicate that a field should not be serialized when the object containing it is serialized. Serialization is the process of converting an object into a byte stream, typically for storage or transmission. When an object is deserialized, transient fields are not restored to their original values, as …
The return keyword in Java is used to exit from a method and optionally pass a value back to the caller. It plays a crucial role in determining the flow of execution and in providing outputs from methods.
The void keyword in Java is used to specify that a method does not return any value. It is a return type that indicates the method performs an action but does not produce a result that can be used or returned to the caller.
The non-sealed keyword in Java is used to declare that a class or interface that extends or implements a sealed class or interface is open to further subclassing. This feature, introduced in Java 17, allows for flexibility in extending a class hierarchy that would otherwise be restricted by the sealed keyword.
The sealed keyword in Java is used to restrict which classes or interfaces can extend or implement a given class or interface. This feature, introduced in Java 17, allows developers to define a more controlled and predictable class hierarchy. A sealed class or interface specifies a list of permitted subclasses or implementors, providing more fine-grained …
The provides keyword in Java is part of the Java Platform Module System (JPMS) introduced in Java 9. It is used within a module declaration to specify that the module provides an implementation of a service interface. This keyword is paired with the with keyword to declare the specific implementation class.
The uses keyword in Java is part of the Java Platform Module System (JPMS) introduced in Java 9. It is used within a module declaration to specify that the module depends on a service interface. This keyword indicates that the module will use a service provider that implements the specified service interface.
The opens keyword in Java is used within a module declaration to specify that a package is open for deep reflection by other modules. This allows other modules to use reflection to access all types and members of the specified package, including private members. This feature is part of the Java Platform Module System (JPMS) …
The open keyword in Java is used within a module declaration to specify that all packages in the module are open for deep reflection. This is particularly useful for frameworks and libraries that rely on reflection to access the internal details of a class. It was introduced in Java 9 as part of the Java …
The requires keyword in Java is used within a module definition to specify module dependencies. It indicates that the current module depends on another module to function correctly. This is part of the Java Platform Module System (JPMS), introduced in Java 9, which provides a way to modularize Java applications and libraries.
The exports keyword in Java is used within a module definition to make a package accessible to other modules. This is part of the Java Platform Module System (JPMS), introduced in Java 9, which provides a way to modularize Java applications and libraries.
The module keyword in Java is used to define a module, which is a named, self-describing collection of code and data. This feature was introduced in Java 9 as part of the Java Platform Module System (JPMS). Modules help to encapsulate and manage dependencies in large applications.
The volatile keyword in Java is used to indicate that a variable’s value will be modified by different threads. It ensures that changes made to a variable in one thread are immediately visible to other threads, thus providing a lightweight synchronization mechanism.
The synchronized keyword in Java is used to control access to critical sections of code by multiple threads. It ensures that only one thread can execute a block of code or method at a time, preventing race conditions and ensuring thread safety.
The throws keyword in Java is used in method signatures to declare that a method can throw one or more exceptions. This informs the callers of the method that they need to handle or propagate these exceptions. Table of Contents Introduction throws Keyword Syntax Understanding throws Examples Declaring a Method with Throws Handling Multiple Exceptions …
The throw keyword in Java is used to explicitly throw an exception from a method or any block of code. This allows for more granular control over the exception handling process, enabling you to signal error conditions in your program.