Java vs Scala – Feature wise Comparison Guide 3

1. Objective of Java vs Scala

Scala – the language of Big Data.In this tutorial we will learn Scala programming vs Java programming, what features make programming in Scala easier than java and how you can compare java scala. It explains java vs Scala to make you understand why java programmer must learn scala now. It will also give you scala vs java performance to explain how scala development is easy and why scala developer is preferred.

Java vs Scala Feature wise Comparison Guide

2. Difference between Java and Scala

Object Oriented Java language is object oriented Scala language is also object oriented
Functional programming Java programming does not support functional programming paradigm . Scala programming supports functional programming paradigm, which is one of its core strength
Multi core CPU
Java doesn’t take advantage of multi core CPU architecture as current CPU development trend is towards adding more CPU cores rather than increasing CPU cycle. Scala takes advantage of multi core architecture of current CPU as it supports functional programming paradigm.
Compiler Java has javac compiler which compiles the java code into byte code. Scala has scalac compiler which compiles scala code into byte code. At the compiler level, all the JVM languages like Scala, Groovy, JRuby become similar to java as they all use same memory space,type system,and run inside the same JVM
JVM Java is a JVM based language. The byte code generated by javac compiler runs on java virtual machine (JVM) Scala is also JVM based language .The byte code generated after compilation is run inside the same JVM and it also takes the advantage of ubiquity, administrative tool, profiling, garbage collection etc.
IDE support Java has a good IDE support, many IDEs are specifically developed for java. Major java programming IDE are Eclipse, Netbeans and IntelliJ IDE support for Scala is not good as compared to java. Scala plugins are still under development. Major java programming IDE like Eclipse, Netbeans support Scala but not effectively. InteliJ IDEA has got a better support for scala as compared to other IDEs.
REPL application Java does not support REPL (Read-Evaluate-Print Loop) interactive shell. Scala supports REPLdue to which developers can explore and access their dataset and prototype their application easily without full-blown development cycle.
Succinct and
Concise code
Java is always on firing line for being too verbose. Any code written in java in 5 to 6 lines can be written in Scala in 2 to 3 lines.
e.g : A java program of Hello world program-public class HelloJava {
public static void main(String[] args) {
System.out.println(“Hello World !!!”)
Scala reduces the number of lines of code by clever use of type inference, treating everything as an object. Scala is designed to express common programming pattern in an ellegant, concise, immutable and type safe way. Scala compiler avoids the developer to write those things explicitly that the compiler can infer.
e.g :- A Scala program of Hello Word program-Object HelloScala {
def main(args : Array[String]):Unit {
Lazy Evaluation Java does not support lazy evaluation Scala key feature is lazy evaluation, that allows differing time consuming computation until absolutely needed by using keyword “lazy”
e.g. // As loading image is a slow process, it shall be done only if needed to show images. This can be done using Lazy evaluationlazy val images = getImages() // lazy keyword is used for lazy computationif (viewProfile) {
else (editProfile) {
else { // do something without loading image.
Readability Java is more readable than Scala because less nested code is used here as compared to scala. In Scala, the code can be very nested as we can define function inside function, inside other function, inside an object or inside a class.Sometime it may improve clarity, but if written poorly, it can be really tricky to understand.
Operator Overloading Java does not supprt Operator overloading. Scala supports Operator Overloading. We can overload any operator here and can create new operator of any type.
Learning curve Java is less nested as compared to Scala and as operator overloading is not supported by it, learning java is simpler than scala. Scala supports nested coding and user define operator overloading. This makes learning Scala tough and messy as compared to java as user might come up with multiple meaning for same operator.
Compile Time Java compiles faster than Scala.It can generate byte code within a second which is a great performance feature of java. Scala compiles slowly as compared to java.It can even take an hour to compile if your processor is not super fast with a bundle of cores. A new compiler is under development for high speed for Scala.
Programming error Java does not support user defined operator overloading which reduces chances for programming error. Scala supports operator overloading hence there are chances of programming error.
Finding Error Java compiler gives all its error with complete traceability. One can simply double click on the error to go to its exact location. In Scala, you need to give considerable amount of time to find the errors. For beginners, tracking errors from stack trace is a screwing job.
Backward Compatibility Java provides backward compatibility that means Java 8 is completely compatible with code written in older versions and can execute it. Scala has all advantages of java except backward compatibility that is  a key difference between java and Scala
Dynamic Behaviour Java is Dynamic Language that means you can not find all the bugs at compile time until and unless the system is deployed. Scala is purely Static language, due to which you will never face hectic time destroying errors.You will never see null pointer exception in scala as there is no concept of null in scala.


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