feat: read and print the contents of a file

Signed-off-by: https://github.com/Someshdiwan <[email protected]>

Author: Someshdiwan

Section23JavaIOStreams/src/AppendLogsToFile.java

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+import java.io.FileWriter;
+import java.io.IOException;
+
+class AppendLogsToFile {
+    public static void addLogsToFile(String filepath, String log1, String log2){
+        try {
+            // Create a FileWriter in append mode
+            FileWriter writer = new FileWriter(filepath, true);
+
+            // Append text to the file
+            writer.write(log1 + "\n");  // Write log1 and move to new line
+            writer.write(log2 + "\n");  // Write log2 and move to new line
+
+            // Close the writer to save changes
+            writer.close();
+        } catch (IOException e) {
+            System.out.println("An error occurred");
+        }
+    }
+    public static void main (String[] args) throws java.lang.Exception
+    {
+        String filepath = "/Users/somesh/Java SE/JavaEvolution-Learning-Growing-Mastering/Section23JavaIOStreams/src/MyJAVA/logs.txt";
+        String log1 = "log 1";
+        String log2 = "log 2";
+        addLogsToFile(filepath, log1, log2);
+    }
+}

Section23JavaIOStreams/src/CSVFileWritingInJava.java

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+import com.opencsv.CSVWriter;
+import java.io.FileWriter;
+
+public class CSVFileWritingInJava {
+    public static void main(String[] args) {
+        // Step 1: Path to the CSV file
+        String filePath = "/Users/somesh/Java SE/JavaEvolution-Learning-Growing-Mastering/Section23JavaIOStreams/src/MyJAVA/data.csv";
+
+        try {
+            // Step 2: FileWriter to write to the file
+            FileWriter fileWriter = new FileWriter(filePath);
+
+            // Step 3: CSVWriter from OpenCSV to write CSV rows
+            CSVWriter csvWriter = new CSVWriter(fileWriter);
+
+            // Step 4: Write header
+            String[] header = { "Name", "Age", "City" };
+            csvWriter.writeNext(header);
+
+            // Step 5: Write data rows
+            String[] row1 = { "Alice", "25", "Bangalore" };
+            String[] row2 = { "Bob", "30", "Delhi" };
+            String[] row3 = { "Charlie", "22", "Mumbai" };
+
+            csvWriter.writeNext(row1);
+            csvWriter.writeNext(row2);
+            csvWriter.writeNext(row3);
+
+            csvWriter.close();
+
+        } catch (Exception e) {
+            System.out.println("Something went wrong while writing to the file.");
+            e.printStackTrace();
+        }
+    }
+}

Section23JavaIOStreams/src/DailyGratitudeLogger.java

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+import java.io.FileWriter;
+import java.io.IOException;
+
+class DailyGratitudeLogger {
+    public static void addFormattedLinesToFile(String filepath, String line) {
+        try {
+            // Create a FileWriter in append mode
+            FileWriter writer = new FileWriter(filepath, true);
+
+            // Convert string to uppercase and write it to the file
+            writer.write(line.toUpperCase());
+            writer.write("\n");  // Move to the next line
+
+            // Convert string to lowercase and write it to the file
+            writer.write(line.toLowerCase());
+            writer.write("\n");  // Move to the next line
+
+            // Close the writer to save changes
+            writer.close();
+        } catch (IOException e) {
+            System.out.println("An error occurred");
+        }
+    }
+
+    public static void main (String[] args) throws java.lang.Exception
+    {
+        String filepath = "/home/chef/workspace/output.txt";
+        String line = "This is a sample line.";
+        addFormattedLinesToFile(filepath, line);
+    }
+}

Section23JavaIOStreams/src/FindLongestCommentLength.java

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+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.io.IOException;
+import java.util.List;
+
+public class FindLongestCommentLength {
+    // Method to find length of longest comment
+    public static int findLongestComment(String filePath) {
+        try {
+            // Read all lines from the file
+            List<String> lines = Files.readAllLines(Paths.get(filePath));
+
+            int maxLength = 0;
+
+            // Loop through each line to find the longest
+            for (int i = 0; i < lines.size(); i++) {
+                int length = lines.get(i).length();
+                if (length > maxLength) {
+                    maxLength = length;
+                }
+            }
+
+            return maxLength;
+
+        } catch (IOException e) {
+            System.out.println("Error reading file: " + e.getMessage());
+            return -1;
+        }
+    }
+    public static void main(String[] args) {
+        String filePath = "";
+        System.out.println(findLongestComment(filePath));
+    }
+}

Section23JavaIOStreams/src/MyJAVA/Data.txt

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+Name, Age, City
+John Doe, 25, New York
+Jane Smith, 30, Los Angeles
+Alex Johnson, 22, Chicago
+Maria Garcia, 27, Miami
+David Lee, 35, San Francisco
+Emily Davis, 28, Dallas
+Michael Brown, 33, Seattle
+Sophia Wilson, 24, Boston
+James Taylor, 29, Austin
+Olivia Martin, 31, Portland

Section23JavaIOStreams/src/MyJAVA/Employee.csv

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+Name,Designation,Salary
+John,Manager,75000
+Emma,Developer,55000
+Sophia,Designer,60000

Section23JavaIOStreams/src/MyJAVA/cities.txt

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+New York
+London
+Tokyo
+Paris
+Sydney
+Mumbai

Section23JavaIOStreams/src/MyJAVA/comments.txt

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+hi
+Longest Comment
+hello

Section23JavaIOStreams/src/MyJAVA/data.csv

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+"Name","Age","City"
+"Alice","25","Bangalore"
+"Bob","30","Delhi"
+"Charlie","22","Mumbai"

Section23JavaIOStreams/src/MyJAVA/forecast.json

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+{
+  "city": "New Delhi",
+  "temperature": "25C",
+  "condition": "Clear Skies"
+}