Final answer:
The student's question is about a Java method implementation for converting characters to uppercase using the built-in Character.toUpperCase method.
Step-by-step explanation:
The question pertains to a method in the Java programming language that is used to convert characters to uppercase. Specifically, it seems the student is asking how to implement a method that converts a given character to uppercase using the Character.toUpperCase method provided by the Java API. A corrected version of the method signature provided would be 'public static char toUpperCase(char argument)', and the implementation of this method would call Character.toUpperCase(argument) to convert the passed character argument to its uppercase equivalent.