| It was originally designed to be an object-oriented language, but it began supporting functional programming features in recent years. |
Originally intended to be both an object-oriented and functional language, Scala supports concurrency and immutability, as well as many other features of functional programming. |
| It takes a short time to convert source code to byte code. |
It takes a long time to compile the source code into byte code. |
| In Java, even the most mundane and simple tasks require long-form code. |
Scala is designed to be concise. One line of Scala code can easily replace twenty lines of “simple” Java code, even though it is a slightly more complex language. |
| Lazy evaluation and operator overloading are not supported. |
Lazy evaluation and operator overloading are supported. |
| Due to Java's backward compatibility, code written in the new version will run without error in an older version. |
The language does not provide backward compatibility. |
| Grails, spring, and many other frameworks are supported. |
Scala supports frameworks such as Play and Lift. |
| Objects are treated as functions in Java. |
In Scala, any method or function can be treated as a variable. |
| Java variables are mutable by default. |
Scala variables are immutable by default. |
| When compared to Scala, Java is easier to read. |
Unlike Java, Scala includes nested coding, making it less readable. |
| Static keywords are used in Java. |
There are no static keywords in Scala. |
| Multiple inheritances are not supported by classes, but by interfaces. |
The language supports multiple inheritances through classes, but not through abstract classes. |
