Java 如何使用exception使代码在列出的所有内容中运行？

我有两个具有相同文件夹树结构和文件名的目录。这些是本周和上周的数据。我将把新数据添加到旧数据中，每对数据都要命名，并将其保存在另一个具有原始文件树结构的目录下

如果我想让exception/use try catch通过skip（如果目录中不存在列出的所有文件），如何抛出exception/use try catch

还是我犯了什么错误

import java.io.*;
import java.util.ArrayList;
import java.util.List;

public class Merge {
    public static void  main(String[] args) {
        List<String> fileListA = new ArrayList<String>();
        if (args.length != 3) {
            System.out.println("Usage: Merge -DirA -DirB -OutputDir");
        } else {
            System.out.println("Path:" + args[0]);
            // Read all text file from the specified path
            fileListA = getInputFileNames(args[0], "txt");

            int count = 0;
            for (String str : fileListA){
                String data;
                // Path of files form DirA and DirB
                String filePathA = str;
                System.out.println("PathA:" + filePathA);
                String filePathB = str.replace(args[0], args[1]);
                System.out.println("PathB:" + filePathB);
                // Buffer for reading fileA and fileB
                BufferedReader brA = new BufferedReader(new FileReader(filePathA));
                BufferedReader brB = new BufferedReader(new FileReader(filePathB));
                // Create fileOut object
                File fileOut = new File(str.replace(args[0], args[2]));
                System.out.println("PathOut:" + str.replace(args[0], args[2]));
                // Create fileOut if doesn't exist
                if (!fileOut.exists()) {
                    fileOut.createNewFile();
                }
                // Buffer for writing fileOut
                BufferedWriter bw = new BufferedWriter(new FileWriter(fileOut.getAbsoluteFile()));
                // Read through fileA and fileB, append each line to fileOut
                while ((data = brA.readLine()) != null) {
                    bw.write(data);
                    bw.newLine();
                }
                brA.close();
                while ((data = brB.readLine()) != null) {
                    bw.write(data);
                    bw.newLine();
                }
                brB.close();
                bw.close();
                count++;
            }

            System.out.println("Files done"+ count);
        }

    }

    public static List<String> getInputFileNames(String sDir, String ext){
        // Get all file names from a given path, recursively go into each sub-directory as well

        //System.getProperty("file.separator");
        List<String> results = new ArrayList<String>();
        File [] files = new File(sDir).listFiles();
        for (File file : files){
            if (file.isFile()){
                String fName = file.getAbsolutePath();
                if (fName.substring(fName.lastIndexOf(".")+1).equalsIgnoreCase(ext)){
                    results.add(fName);
                }               
            } else if (file.isDirectory()){
                List<String> subResults = getInputFileNames(file.getPath(), ext); 
                if (!subResults.isEmpty()){
                    results.addAll(subResults);
                }
            } else {
                // Not a file or directory
            }
        }
        return results;
    }

}