To clean ASCII text in Java and remove non-printable characters, you can use a regular expression to match non-printable characters and then remove them from the input string. Here is one way to do this:

public static String cleanAsciiText(String text) {
    // Remove non-printable characters from the text
    String cleanText = text.replaceAll("\\p{C}", "");

    return cleanText;
}

In this code, the cleanAsciiText method takes a String argument representing the input text and returns a String with non-printable characters removed. The regular expression used in this example matches any Unicode control character, including ASCII control characters such as tabs, line breaks, and carriage returns.

The replaceAll method of the String class is used to replace all instances of the regular expression with an empty string. This effectively removes any non-printable characters from the input text.

You can call this method from your Java code to clean ASCII text and remove non-printable characters as needed. This can be useful for sanitizing input text before processing or displaying it.