Ex: If the input is: -Hello, 1 world$! he output is: Helloworld The program must define and call the following method that takes a string as a parameter and returns the string w alphabetic characters. public static String removeNonAlpha(String userString) 65076.2342078.qx3zay7 LAB 22.27.1: LAB: Remove all non-alphabetic characters - method АСTIVITY LabProgram.java

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Methods of StringBuilder class

The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.