How to read a Text File in Java

Question

What is the simplest way to read the data from a Text File?

Answer 1

To read the data from a Text File, we have to import Scanner package.

import java.util.Scanner;

Scanner Class is used to read the data.

File file=new File("Student.txt");

try {

    Scanner input=new Scanner(file);
    String name=input.nextLine();
    int marks=input.nextInt();
    System.out.printf("Name: %s and Marks: %d",name,marks);

}catch(FileNotFoundException e)
{
   System.out.println("Exception is: "+e);
}

Answer 2

BufferedReader br = new BufferedReader(new FileReader("file.txt"));
try {
    StringBuilder sb = new StringBuilder();
    String line = br.readLine();

    while (line != null) {
        sb.append(line);
        sb.append(System.lineSeparator());
        line = br.readLine();
    }
    String everything = sb.toString();
} finally {
    br.close();
}

Answer 3

You can use readAllLines and the join method to get whole file content in one line:

String str = String.join("\n",Files.readAllLines(Paths.get("e:\\text.txt")));

Also, you can use readAllBytes:

String str = new String(Files.readAllBytes(Paths.get("e:\\text.txt")), StandardCharsets.UTF_8);

I think readAllBytes is faster and more precise because it does not replace a new line with \n and also new line may be \r\n. It is depending on your needs which one is suitable.