Java Scanner nextLine() Method

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Description

The java Scanner nextLine() method advances this scanner past the current line and returns the input that was skipped. This method returns the rest of the current line, excluding any line separator at the end. The position is set to the beginning of the next line. Since this method continues to search through the input looking for a line separator, it may buffer all of the input searching for the line to skip if no line separators are present.

Declaration

Following is the declaration for java.util.Scanner.nextLine() method

public String nextLine()

Parameters

NA

Return Value

This method returns the line that was skipped

Exception

• NoSuchElementException − if no line was found

• IllegalStateException − if this scanner is closed

Getting Next Line of a Scanner on a String Example

The following example shows the usage of Java Scanner nextLine() method to advance the scanner past the current line. We've created a scanner object using a given string. Then we print a line using nextLine() method and then made a check using hasNextLine() if more data is present or not. Once lines are finished, hasNextLine() returns false. In the end scanner is closed using close() method.

package com.tutorialspoint;

import java.util.Scanner;

public class ScannerDemo {
   public static void main(String[] args) {

      String s = "Hello World! \n 3 + 3.0 = 6 ";

      // create a new scanner with the specified String Object
      Scanner scanner = new Scanner(s);

      // print the next line
      System.out.println(scanner.nextLine());

      // check if there is a next line again
      System.out.println(scanner.hasNextLine());

      // print the next line
      System.out.println(scanner.nextLine());

      // check if there is a next line again
      System.out.println(scanner.hasNextLine());

      // close the scanner
      scanner.close();
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Hello World! 
true
 3 + 3.0 = 6 
false

Getting Next Line of a Scanner on User Input Example

The following example shows the usage of Java Scanner hasNextLine() method to advance the scanner past the current line. We've created a scanner object using System.in. Then we print a line using nextLine() method and then made a check using hasNextLine() if more data is present or not. Once lines are finished, hasNextLine() returns false. In the end scanner is closed using close() method.

package com.tutorialspoint;

import java.util.Scanner;

public class ScannerDemo {
   public static void main(String[] args) {

      // create a new scanner with the System Input
      Scanner scanner = new Scanner(System.in);

      // print the next line
      System.out.println(scanner.nextLine());

      // check if there is a next line again
      System.out.println(scanner.hasNextLine());

      // close the scanner
      scanner.close();
   }
}

Output

Let us compile and run the above program, this will produce the following result − (where we've entered Hello World and pressed enter and then typed Bye and pressed enter.)

Hello World
Hello World
Bye
true

Getting Next Line of a Scanner on a Properties File Example

The following example shows the usage of Java Scanner hasNextLine() method to advance the scanner past the current line. We've created a scanner object using a file properties.txt. Then we checked each line using hasNextLine() method and printed them using nextLine() method. In the end scanner is closed using close() method.

package com.tutorialspoint;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class ScannerDemo {
   public static void main(String[] args) throws FileNotFoundException {

      // create a new scanner with a file as input
      Scanner scanner = new Scanner(new File("properties.txt"));

      // print the next line
      System.out.println(scanner.nextLine());

      // check if there is a next line again
      System.out.println(scanner.hasNextLine());

      // close the scanner
      scanner.close();
   }
}

Assuming we have a file properties.txt available in your CLASSPATH, with the following content. This file will be used as an input for our example program −

Hello World! 3 + 3.0 = 6

Output

Let us compile and run the above program, this will produce the following result −

Hello World! 3 + 3.0 = 6
false