Why java is called robust?

Robust means reliable and no programming language can really assure reliability. Java puts a lot of emphasis on early checking for possible errors, as Java compilers are able to detect many problems that would first show up during execution time in other languages.

Java has the strong memory allocation and automatic garbage collection mechanism. It provides the powerful exception handling and type checking mechanism as compare to other programming languages. Compiler checks the program whether there any error and interpreter checks any run time error and makes the system secure from crash. All of the above features makes the java language robust.

 Java example of "robust" code:

if (var == true) {
    ...
} else if (var == false) {
    ...
} else {
    ...
}

 "robust code" means that your program takes into account all possibilities, and that there is no such thing as an error - all situations are handled by the code and result in valid state, hence the "else".

I am doubtful, however. If the variable is a boolean, what is the point of checking a third state when a third state is logically impossible?

"Having no such thing as an error" seems ridiculous as well; even Google applications show errors directly to the user instead of swallowing them up silently or somehow considering them as valid state. And it's good - I like knowing when something goes wrong. And it seems quite the claim to say an application would never have any errors.