1. It is compact and easy to learn syntax.
  2. It integrates with Java programs and libraries.
  3. Java code can be enhanced using Groovy and we can also mix them if needed.
  4. Groovy uses advanced programming concepts like Metaprogramming, Functional Programming and Closures.
  1. Java only allows static typing whereas Groovy allows both statically-typed and dynamic-typed (no need to declare the data-type of a variable instead use def keyword).
  2. Java requires developer to write boilerplate code such as Getter and Setter methods for the class member(s) whereas Groovy generates both methods at runtime so no need to write it.
  3. In Java, developer needs to explicitly define constructor(s), equals, hashCode and toString methods whereas Groovy provides annotations such as @EqualsHashCode for generating these methods at compile time. It is also called AST Transformation.
  4. In Java by default java.lang.* package is imported whereas Groovy automatically imports commonly used packages such as java.util.* and*.
  5. In Java, the default modifier is package-private i.e. default whereas in Groovy the default modifier is public. We can enforce encapsulation based on need.
  6. In Java, semicolon is needed to separate two statements but in Groovy it is optional.




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