What’s the difference between instance method reference types in Java 8?

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  1. myString::charAt would take an int and return a char, and might be used for any lambda that works that way. It translates, essentially, to index -> myString.charAt(index).

  2. String::length would take a String and return an int. It translates, essentially, to string -> string.length().

  3. String::charAt would translate to (string, index) -> string.charAt(index).

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