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If you are looking to improve your code, perhaps CODE REVIEW is more appropriate.

chars are effectively deprecated. Iterate over code points instead.

This way, you avoid a lot of processing in case there aren't any. That doesn't make sense really. Let's leave aside the fact that the current spec and implementation indicate that the requirement ...

Save a new String, in which you store a reference to: String testCaps = sentence.toLowerCase(); if ( !testCaps.equals(sentence) ) => you know there's at least one upper case. This way, you avoid a ...

I see two possibilities: either you convert onlyCaps into a class attribute and getCapitalsOnly() returns a boolean indicating whether capital letters were found, or you return an array of Object, ...

Try it with this: getCapitalsOnly("🅒hallenge" ); How is that defined? Run echo 'Character.isUpperCase("🅒".codePointAt(0))' | jshell

The current code mixes status with results—to quote Brian Fellows, that method is a liar. There are several ways to address that particular nit. Re: exceptions (as suggested) is one of them; I don't ...

Please edit your question to have a more descriptive title. It will help if you can also describe what you've done already and clarify what exactly the problem is. The one thing that jumps out at me ...

tl;dr Use code point integer numbers when working with individual characters. Avoid char type. "Hello 42" .codePoints() // Generate an ` IntStream ` of code points. .filter ...

Initialize your list Perhaps you neglected to establish an empty list to hold your destinations. In this example, we use new ArrayList<>() to establish a new empty list on the same line where we ...

The linked "performance tips section" notes that what is reasonable depends on how it will be used: OK if fm are time consuming so dispatch is a tiny part of the time, or OK if the user type ...

Array list is part of the java.util package and implements the List interface. The difference between a built-in array and an ArrayList in Java, is that the size of an array cannot be modified (if you ...