Find Salesforce Reports using specific fields

ReportsFinder.java

package com.MyProject;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

//This class looks into the reports folder and finds reports using the specific fields that we are interested in.
public class ReportsFinder {
	
        //This variable holds report name as key and API field names(we are interested) in as values.
	static Map<String, Set<String>> reportFieldSet = new HashMap<>();
        //This variable contains the API field names that we are looking for in Reports.
	static List<String> fieldNames = new ArrayList<String>();
	
	public static void main(String[] args){
    
                // Base reports folder.
		File folder = new File("/home/ram/deter/My_SFDC_Project/src/reports");
		
                //Add field names to the list
		fieldNames.add("FieldOne__c");
		fieldNames.add("FieldTwo__c");
		
		try{
			searchReports(folder);
		}catch(Exception e){
			System.out.println(e.getMessage());
		}
		
		for(String reportName: reportFieldSet.keySet()){
			if(reportFieldSet.get(reportName).size() > 0){
				System.out.println(reportName +  " uses the below fields: ");
			}
			
			for(String fieldName: reportFieldSet.get(reportName)){
				System.out.println("    " + fieldName);
			}
		}
	}
	
	public static void searchReports(File folderName) throws FileNotFoundException,IOException{
		for (File fileEntry : folderName.listFiles()) {
			
			if(fileEntry.isDirectory()){
				searchReports(fileEntry);
			}else{
				reportFieldSet.put(folderName.getName() + "/" + fileEntry.getName(), new HashSet<>());
				
				FileReader fileReader = new FileReader(fileEntry);
				BufferedReader bufferedReader = new BufferedReader(fileReader);
				String line;
				
				while ((line = bufferedReader.readLine()) != null) {
					for(String fieldName : fieldNames){
						if(line.contains(fieldName)){
							reportFieldSet.get(folderName.getName() + "/" + fileEntry.getName()).add(fieldName);
						}
					}
				}
				fileReader.close();
			}
	    }
	}
}