how to write in a file java code example

Example 1: Java program to write to text file

// Java program to write to text file
import java.io.FileNotFoundException;
import java.io.PrintWriter;
public class WriteIntoTextFile 
{
   public static void main(String[] args)
   {
      try
      {    
         FileWriter fw = new FileWriter("B:\\demo.txt");    
         fw.write("Hello World");    
         fw.close();    
      }
      catch(Exception ex)
      {
         System.out.println(ex);
      }    
      System.out.println("Successful");
   }
}

Example 2: write file java

@Test
public void givenUsingJava7_whenWritingToFile_thenCorrect() 
  throws IOException {
    String str = "Hello";
 
    Path path = Paths.get(fileName);
    byte[] strToBytes = str.getBytes();
 
    Files.write(path, strToBytes);
 
    String read = Files.readAllLines(path).get(0);
    assertEquals(str, read);
}