Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind Java Scanner nextLine() Method?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Fill blank
Complete the missing token from the example code.
import java.io.File; // Import the File ___3Order
Put the learning moves in the order that makes the concept easiest to apply.
Output the contents a file line by line:
Definition and Usage
Java Scanner nextLine() Method
❮ Scanner Methods
Example
Output the contents a file line by line:
import java.io.File; // Import the File class
import java.io.FileNotFoundException; // Import this class to handle errors
import java.util.Scanner; // Import the Scanner class to read text files
public class ReadFile {
public static void main(String[] args) {
try {
File myObj = new File("filename.txt");
Scanner myReader = new Scanner(myObj);
while (myReader.hasNextLine()) {
String data = myReader.nextLine();
System.out.println(data);
}
myReader.close();
} catch (FileNotFoundException e) {
System.out.println("An error occurred.");
e.printStackTrace();
}
}
}Definition and Usage
The nextLine() method returns a string containing all of the characters up to the next new line character in the scanner, or up to the end of the scanner if there are no more new line characters.
Syntax
public String nextLine()Technical Details
| Returns: | A String value containing the next line of text in the scanner. |
|---|---|
| Throws: | NoSuchElementException - If there are no more lines in the scanner. IllegalStateException - If the scanner has been closed. |
❮ Scanner Methods