Demonstrate Multithreading (With Issues)

Pluralsite/src/intermediate/Java Fundamentals - The Core Platform/src/multi/threading/Adder.java

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+package multi.threading;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+public class Adder implements Runnable {
+    private final String inFile;
+    private final String outFile;
+
+    public Adder(String inFile, String outFile) {
+        this.inFile = inFile;
+        this.outFile = outFile;
+    }
+
+    public void doAdd() throws IOException {
+        int total = 0;
+        String line;
+
+        try (BufferedReader reader = Files.newBufferedReader(Paths.get(inFile))) {
+            while ((line = reader.readLine()) != null)
+                total += Integer.parseInt(line);
+        }
+
+        try (BufferedWriter writer = Files.newBufferedWriter(Paths.get(outFile))) {
+            writer.write("Total: " + total);
+        }
+    }
+
+    @Override
+    public void run() {
+        try {
+            doAdd();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

Pluralsite/src/intermediate/Java Fundamentals - The Core Platform/src/multi/threading/Main.java

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+package multi.threading;
+
+public class Main {
+    private static final String rootResources = "C:\\Users\\sgoud\\JavaProjects\\Learning-Java\\Pluralsite\\src\\intermediate\\Java Fundamentals - The Core Platform\\resources\\threading\\";
+
+    public static void main(String[] args) throws InterruptedException {
+        String[] inFiles = {
+                rootResources + "inputFile1.txt",
+                rootResources + "inputFile2.txt",
+                rootResources + "inputFile3.txt",
+                rootResources + "inputFile4.txt",
+                rootResources + "inputFile5.txt",
+                rootResources + "inputFile6.txt"
+        };
+        String[] outFiles = {
+                rootResources + "outputFile1.txt",
+                rootResources + "outputFile2.txt",
+                rootResources + "outputFile3.txt",
+                rootResources + "outputFile4.txt",
+                rootResources + "outputFile5.txt",
+                rootResources + "outputFile6.txt"
+        };
+        Thread[] threads = new Thread[inFiles.length];
+
+        for(int i=0; i < inFiles.length; i++) {
+            Adder adder = new Adder(inFiles[i], outFiles[i]);
+            Thread thread = new Thread(adder);
+            thread.start();
+        }
+
+        for (Thread thread : threads) {
+            thread.join();
+        }
+    }
+}