How To - Create & Write to a TextFile

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Creating & Writing to a TextFile

The below methods is the easiest way to create and write to a Text File in Java, using the following I/O Components:

  • java.io.File

  • java.io.FileWriter



Writing to a text file, replacing contents

  public class IOTest {

      public void writeToTextFile(String content, String fileName) throws IOException {
          File file = new File(fileName);
          if (file.exists() != true) { // Checking if the file exists or not. If it doesn't exist create a new file.
              file.createNewFile(); // Remeber to add catch clause for IOException
          }
          FileWriter writer = new FileWriter(file);
          writer.write(content); // Could also use -- writer.append() -- method.
          writer.flush();
          writer.close();
      }

  }

Writing to an existing text file and keeping contents

  public class IOTest {

      public void writeToTextFile(String content, String fileName) throws IOException {
          File file = new File(fileName);
          if (file.exists() != true) { // Checking if the file exists or not. If not create a new file.
              file.createNewFile(); // Remeber to add catch clause for IOException
          }
          // The "true" will append the new data, while retaining the old data.
          FileWriter writer = new FileWriter(file, true);
          writer.write(content); // Could also use -- writer.append() -- method.
          writer.flush();
          writer.close();
      }

  }
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