highschool/Grade 10/Computer Science/ICS4U1/Reading And Writing To Files.md

## Reading and Outputting Files

Outputing To Files
- you can save it for future use
- The printwriter class can be used to createa file and wrtie data to it
- necessay imports:
```java
import java.io.IOException;
import java.io.PrintWriter;
```

- Or:
```
import java.io.*;
```

- It is declared similarly to the scanner class

Different types of file can be created for data to be written to, depends on the extension eg. ".txt" creates a text file while docsx creates a docx document

```java
code

```

## Reading To Files
- Speed
- Less errors
- Easier to read individual cases
- able to get data from sources other than keyboard
- changing information is easy only to file
- more efficient less time to test
- large amounts of data can be entered quickly
- at the testing stage, data can be easily

## How
- The file class is java's representation of a file or directoy path
- it is used to identify/ocate the file that is to be read
- code
- Scanner calss is used to read from file

## Sample Code
```java
import java.util.Scanner;
import java.io.File;
import java.io.IOException;
public class ReadingToFileDemo {
    public static void (String[]args) throws IOException {
        File file = new File("test.txt); // the file you are reading from
        Scanner read = new Scanner(file);
        while(read.hasNext()) {
            System.out.println(read.nextLine());
            read.next();
        }
    }
}
```