Apache Groovy: Combining the Best of Python and Java

Odd choice to tell readers to stay tuned for the other articles instead of linking to them. The intro seems a bit superficial – if Groovy combines Java & Python, wouldn't it make sense to at least mention what inspiration it takes from Python and where it's on the untyped-typed scale is? The tone of the series feels like marketing speech: "Variables in Apache Groovy: Powerful, concise and easy"

Instead we get an entire article about getters and setters, which uses a Java example with pointless getters and setters that just directly read/write a variable.

> Groovy has syntactic support for maps using [] to get and set the value based on the variable within the square brackets

Why variable? Does that mean you can't use expressions for indexing?

    System.err.println "Usage: groovy Groovy01.groovy input-file"
    System.exit(0)

Why does only the second call need parentheses?

    String s
    s = 42

Looks like Groovy is weakly typed?

    strParam != null && strParam.isInteger() ? Integer.parseInt(strParam) : 0

Doesn't Groovy already have if-else? Why also add `?:` ?

> In the previous article, you learned that Groovy’s version of truth means you don’t need to test for not null

The previous article doesn't even mention the word truth.