JAVA

FileInputStream

import java.io.FileInputStream;
import java.io.InputStream;

class Main {
  public static void main(String args[]) {

    byte[] array = new byte[100];

    try {
      InputStream input = new FileInputStream("input.txt");

      System.out.println("Available bytes in the file: " + input.available());

      // Read byte from the input stream
      input.read(array);
      System.out.println("Data read from the file: ");

      // Convert byte array into string
      String data = new String(array);
      System.out.println(data);

      // Close the input stream
      input.close();
    } catch (Exception e) {
      e.getStackTrace();
    }
  }
}

FileInputStream from file

@Test
public void givenUsingPlainJava_whenConvertingFileToInputStream_thenCorrect() 
  throws IOException {
    File initialFile = new File("src/main/resources/sample.txt");
    InputStream targetStream = new FileInputStream(initialFile);
}
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