I agree with you about the checked exceptions being thrown from these methods. But did you have a look at the assumptions mentioned on the exam topics tab of the official OCPJP8 certification exam page? Here is the text fragment I am referring to
Assume the following:
* Missing package and import statements: If sample code do not include package or import statements, and the question does not explicitly refer to these missing statements, then assume that all sample code is in the same package, and import statements exist to support them.
* No file or directory path names for classes: If a question does not state the file names or directory locations of classes, then assume one of the following, whichever will enable the code to compile and run:
- All classes are in one file
- Each class is contained in a separate file, and all files are in one directory
* Unintended line breaks: Sample code might have unintended line breaks. If you see a line of code that looks like it has wrapped, and this creates a situation where the wrapping is significant (for example, a quoted String literal has wrapped), assume that the wrapping is an extension of the same line, and the line does not contain a hard carriage return that would cause a compilation failure.
* Code fragments: A code fragment is a small section of source code that is presented without its context. Assume that all necessary supporting code exists is present and that the supporting environment fully supports the correct compilation and execution of the code shown and its omitted environment.
* Descriptive comments: Take descriptive comments, such as "setter and getters go here," at face value. Assume that correct code exists, compiles, and runs successfully to create the described effect.
If you look at the Code fragments assumption, it applies to these code snippets. Based on this assumption, you can assume that all necessary throws clauses and/or catch handlers do exist and therefore all these code snippets compile successfully and you don't have to consider the checked exceptions not being handled-or-declared while answering the questions. So the answers given in the study guide are spot-on and don't need to be changed.