reading from a text file in java

/**
 * @author lautturi.com 
 * Java example: read text file in java
 */

import java.util.*;
import java.io.*;

public class Lautturi {
    
	public static void main(String[] args) throws NumberFormatException, IOException  {
		try(BufferedReader br = new BufferedReader(new FileReader("test.txt"))) {
		    StringBuilder sb = new StringBuilder();
		    String line = br.readLine();

		    while (line != null) {
		        sb.append(line);
		        sb.append(System.lineSeparator());
		        line = br.readLine();
		    }
		    String filecontent = sb.toString();
		    System.out.println("the content of file "+ filecontent);
		}
	}
}