What does import mean in Java?
import is a Java keyword. It declares a Java class to use in the code below the import statement. Once a Java class is declared, then the class name can be used in the code without specifying the package the class belongs to. Use the '*' character to declare all the classes belonging to the package.
Why do we use import statement in Java?
import statement makes the JVM go to the Java standard library, execute the code there , and substitute the result into the program. Here, no code is copied and hence no waste of memory or processor’s time
What is an IMPORT statement in Java?
- package1: Top-level package
- package2: Subordinate-level package under the top-level package
- myClass: Import only myClass
How to import in Java?
Java has an import statement that allows you to import an entire package (as in earlier examples), or use only certain classes and interfaces defined in the package. The general form of import statement is: import package.name.ClassName; // To import a certain class only import package.name.*. // To import the whole package.
What does import mean in Java?
Import basically means you're adding a Library/Package full of classes and methods that are premade for ease of use. Java.IO is standard for Java Input/Output. So in essence you're importing extra Input/Output functionality. The asterisk on the end means you're importing everything in the Java.IO Package.
What is a scanner in Java?
Basically, Scanner is a class which used to obtain inputs. java.util is a package which contain some classes including Scanner class which we can use by : import java.util.Scanner. the inputs we obtain can be a primitive type like “int”, “float”, “double”, etc.
What is Java.IO?
The java.io package contains nearly every class you might ever need to perform input and output (I/O) in Java. All these streams represent an input source and an output destination. The stream in the java.io package supports many data such as primitives, object, localized characters, etc.
What is a directory in Java?
A directory is a File which can contain a list of other files and directories. You use File object to create directories, to list down files available in a directory. For complete detail, check a list of all the methods which you can call on File object and what are related to directories.
What is a character stream in Java?
Java Byte streams are used to perform input and output of 8-bit bytes, whereas Java Character streams are used to perform input and output for 16-bit unicode. Though there are many classes related to character streams but the most frequently used classes are, FileReader and FileWriter.
What is input stream?
The InputStream is used to read data from a source and the OutputStream is used for writing data to a destination. Here is a hierarchy of classes to deal with Input and Output streams. The two important streams are FileInputStream and FileOutputStream, which would be discussed in this tutorial.
