Szathmáry László honlapja @ DEIK | Java / szöveges file olvasása soronként

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

try
{
String line;
BufferedReader br = new BufferedReader(new FileReader("szoveg.txt"));
while ((line = br.readLine()) != null)
{
System.out.println(line);
}
br.close();
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}

Lásd doksi:

https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/FileReader.html
https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/BufferedReader.html