@Override
	public boolean equals(Object obj) {
		if (!(obj instanceof StringField)) {
			return false;
		}
		StringField f = (StringField) obj;
		if (str == null) {
			return (f.str == null);
		}
		return str.equals(f.str);
	}
Construct a String field with an initial value of s.
@param str initial string value or null
@param immutable true if field value is immutable
Ghidra/Framework/DB/src/main/java/db/StringField.java