merge reading stock data from json

src/main/java/millions/StockInformationCSVReader.java

@@ -0,0 +1,38 @@
+package millions;
+
+import java.io.*;
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.List;
+
+
+public class StockInformationCSVReader {
+  private final File file;
+
+  public StockInformationCSVReader(File file) {
+    this.file = file;
+  }
+
+  public List<Stock> readFile() {
+    List<Stock> stocks = new ArrayList<>();
+    try (Reader reader = new FileReader(file); BufferedReader bufferedReader = new BufferedReader(reader)) {
+      List<String> lines = bufferedReader.readAllLines();
+      for (String line : lines) {
+        // Skips comment and blank lines
+        if ( !(line.startsWith("#") || line.isEmpty()) ) {
+          String[] data = line.split(",");
+          // Ensures only fields of the correct length are read
+          if (data.length == 3) {
+            String symbol = data[0];
+            String company = data[1];
+            BigDecimal price = new BigDecimal(data[2]);
+            stocks.add(new Stock(symbol, company, price));
+          }
+        }
+      }
+    } catch (IOException e) {
+      e.printStackTrace();
+    }
+    return stocks;
+  }
+}

src/main/java/millions/StockInformationCSVWriter.java

@@ -0,0 +1,34 @@
+package millions;
+
+import java.io.*;
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.List;
+
+public class StockInformationCSVWriter {
+  private final List<Stock> stocks;
+  private final File destinationFile;
+
+  public StockInformationCSVWriter(List<Stock> stocks,File destinationFile) {
+    this.stocks = stocks;
+    this.destinationFile = destinationFile;
+  }
+
+  public void write() {
+    StringBuilder builder = new StringBuilder();
+    for (Stock stock : stocks) {
+      builder.append(stock.getSymbol());
+      builder.append(",");
+      builder.append(stock.getCompany());
+      builder.append(",");
+      // Unsure if price history or just latest price should be saved
+      builder.append(stock.getSalesPrice().toPlainString());
+      builder.append("\n");
+    }
+    try (FileWriter writer = new FileWriter(destinationFile); BufferedWriter bufferedWriter = new BufferedWriter(writer)) {
+      bufferedWriter.write(builder.toString());
+    } catch (IOException e) {
+      e.printStackTrace();
+    }
+  }
+}