Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind Java Scanner hasNextLine() 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 hasNextLine() 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 hasNextLine() method returns true if there is another line of text available in the scanner. A line of text is a sequence of one or more characters followed by either a new line character or the end of the scanner's content.
Syntax
public boolean hasNextLine()Technical Details
| Returns: | A boolean value which is true if another line of text is available. |
|---|---|
| Throws: | IllegalStateException - If the scanner has been closed. |
❮ Scanner Methods