What does import do in Scala?
Import in Scala is a mechanism that allows a more direct reference of different entities such as packages, classes, objects, instances, fields and methods. The concept of importing code is more flexible in Scala than it is in Java or C++. Import declarations can be anywhere.
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What is the Scala package?
Package in Scala is a mechanism for encapsulating a group of classes, subpackages, traits, and package objects. It basically provides a namespace to put our code in different files and directories. Packages is an easy way to maintain our code that avoids member name conflicts from different packages.
What packages are automatically imported into Scala?
Note: Scala and java. lang packages, as well as the Predef object, are imported by default.
How do I import a Scala file?
Scala – File I/O
- import Java. me. _ object Demo { def main(args: Array[String]) { val writer = new PrintWriter(new File(“test.txt” )) writer.
- object Demo { def main(args: Array[String]) { print(“Enter your input: ” ) val line = Console. readLine println(“Thank you, you just typed: ” + line) } }
- import scale. me.
How do you import math packages into Scala?
If you write Mathematics. , that is already in scope and will offer a menu of methods on the Math object. If you type Date , alt-enter should bring up a menu of import options. Choose one and the import statement will be inserted into your code.
Can you call Scala from Java?
Yes, Scala classes can be called from Java and vice versa.
What is double in scale?
In Scala, Double is a 64-bit floating point number, which is equivalent to Java’s double primitive type. The -(x: Double) method is used to get the difference of the given Double and Double value. Returns: Returns the difference of this value and x.
How do you multiply in scale?
Function Definition multiply is the name of the function with two variables a and b. We declare another variable c of data type integer, store the result of a*b in this variable and return the calculated variable c. Run the program by typing multiply(50,20) in the Scala shell and you will get a result like res0: Int = 1000.
Is Scala interoperable with Java?
One of the main design goals of Scala is to run on a JVM and provide interoperability with Java. Scala is compiled into Java bytecodes, and you can use tools like javap (Java Class File Disassembler) to disassemble the bytecodes generated by the Scala compiler. For example, Scala uses type erasure to be compatible with Java.