Table of Contents
What is Java canonical name?
Canonical name of a Java class is the name of the class along with the package. For example, the canonical name of the class File is java. io. File. You can also get the canonical name of a particular class using Java method.
What is Java language specification?
It describes all aspects of the language, including the semantics of all types, statements, and expressions, as well as threads and binary compatibility.
What is a Java class name?
Java provides a class with name Class in java. lang package. Instances of the class Class represent classes and interfaces in a running Java application. The primitive Java types (boolean, byte, char, short, int, long, float, and double), and the keyword void are also represented as Class objects.
What is a simple name in Java?
The getSimpleName() method of java Class class returns the simple name of the underlying class as given in the source code. In the case of an anonymous class, it returns an empty string.
What are the types of data types in Java?
Data types are divided into two groups:
- Primitive data types – includes byte , short , int , long , float , double , boolean and char.
- Non-primitive data types – such as String , Arrays and Classes (you will learn more about these in a later chapter)
What does Jdk stand for?
Java Development Kit
The Java Development Kit (JDK) is one of three core technology packages used in Java programming, along with the JVM (Java Virtual Machine) and the JRE (Java Runtime Environment).
What is a object class in Java?
The Object class is the parent class of all the classes in java by default. In other words, it is the topmost class of java. The Object class is beneficial if you want to refer any object whose type you don’t know. Notice that parent class reference variable can refer the child class object, know as upcasting.
What is name name in Java?
Names are used to refer to entities declared in a Java program. A declared entity (§6.1) is a package, class type, interface type, member (field or method) of a reference type, parameter (to a method, constructor, or exception handler), or local variable.
What is the difference between JDK and JRE in Java?
JDK(Java Development Kit) is used to develop Java applications. JDK also contains numerous development tools like compilers, debuggers, etc. JRE(Java Runtime Environment) is the implementation of JVM(Java Virtual Machine) and it is specially designed to execute Java programs.
What is the valid variable name in Java?
A variable name can consist of Capital letters A-Z, lowercase letters a-z digits 0-9, and two special characters such as _ underscore and $ dollar sign. The first character must not be a digit. Blank spaces cannot be used in variable names. Java keywords cannot be used as variable names.
What is diff between JDK JRE and JVM?
JDK is primarily used for code execution and has prime functionality of development. On other hand JRE is majorly responsible for creating environment for code execution. JVM on other hand specifies all the implementations and responsible to provide these implementations to JRE.
How to get the canonical name of a class in Java?
The getCanonicalName () method of java.lang.Class class is used to get the canonical name of this class, which is the canonical name as defined by the Java Language Specification. The method returns the canonical name of this class in the form of String.
What is the difference between getgetname and getcanonicalname in Java?
getName () – returns the name of the entity (class, interface, array class, primitive type, or void) represented by this Class object, as a String. getCanonicalName () – returns the canonical name of the underlying class as defined by the Java Language Specification.
What is the canonical name of a class?
the canonical name is the name that would be used in an import statement. It might be useful during toString or logging operations. When the javac compiler has complete view of a classpath, it enforces uniqueness of canonical names within it by clashing fully qualified class and package names at compile time.
Can two classes have the same canonical name but different binary names?
Class.getName () is documented to return the binary name, as specified in JLS section 13.1. In this case it returns a.b.C$D for D and [La.b.C$D; for D []. This answer demonstrates that it is possible for two classes loaded by the same class loader to have the same canonical name but distinct binary names.