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##On the append The append method returns the writer, so one improvement could be to leverage this and chain the calls together.

So, where you're currently doing this:

fileWriter.append("Date");
fileWriter.append(',');
fileWriter.append("Source");
fileWriter.append(',');
fileWriter.append("AUIDR");
fileWriter.append(',');
fileWriter.append("ADIDR");
fileWriter.append(',');
fileWriter.append("AUEDR");
fileWriter.append(',');
fileWriter.append("ADEDR");
fileWriter.append(',');
fileWriter.append("AUTPG");
fileWriter.append(',');
fileWriter.append("ADTPG");
fileWriter.append(',');
fileWriter.append("AST");
fileWriter.append('\n');

You can instead write it as:

fileWriter
 .append("Date")
 .append(',')
 .append("Source")
 .append(',')
 .append("AUIDR")
 .append(',')
 .append("ADIDR")
 .append(',')
 .append("AUEDR")
 .append(',')
 .append("ADEDR")
 .append(',')
 .append("AUTPG")
 .append(',')
 .append("ADTPG")
 .append(',')
 .append("AST")
.append('\n');

On the append

The append method returns the writer, so one improvement could be to leverage this and chain the calls together.

So, where you're currently doing this:

fileWriter.append("Date");
fileWriter.append(',');
fileWriter.append("Source");
fileWriter.append(',');
fileWriter.append("AUIDR");
fileWriter.append(',');
fileWriter.append("ADIDR");
fileWriter.append(',');
fileWriter.append("AUEDR");
fileWriter.append(',');
fileWriter.append("ADEDR");
fileWriter.append(',');
fileWriter.append("AUTPG");
fileWriter.append(',');
fileWriter.append("ADTPG");
fileWriter.append(',');
fileWriter.append("AST");
fileWriter.append('\n');

You can instead write it as:

fileWriter
 .append("Date")
 .append(',')
 .append("Source")
 .append(',')
 .append("AUIDR")
 .append(',')
 .append("ADIDR")
 .append(',')
 .append("AUEDR")
 .append(',')
 .append("ADEDR")
 .append(',')
 .append("AUTPG")
 .append(',')
 .append("ADTPG")
 .append(',')
 .append("AST")
.append('\n');