Scanner nextLine() method in Java with Examples

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

Syntax:

public String nextLine()

Parameters: The function does not accepts any parameter.

Return Value: This method returns the line that was skipped

Exceptions: The function throws two exceptions as described below:

• NoSuchElementException: throws if no line was found
• IllegalStateException: throws if this scanner is closed

Below programs illustrate the above function:

Program 1:

// Java program to illustrate the
// nextLine() method of Scanner class in Java
// without parameter

import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {

        String s = "Gfg \n Geeks \n GeeksForGeeks";

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

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

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

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

        scanner.close();
    }
}

Output:

Gfg 
 Geeks 
 GeeksForGeeks

Program 2: To demonstrate NoSuchElementException

// Java program to illustrate the
// nextLine() method of Scanner class in Java

import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {

        try {

            String s = "";

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

            System.out.println(scanner.nextLine());
            scanner.close();
        }
        catch (Exception e) {
            System.out.println("Exception thrown: " + e);
        }
    }
}

Output:

Exception thrown: java.util.NoSuchElementException: No line found

Program 3: To demonstrate IllegalStateException

// Java program to illustrate the
// nextLine() method of Scanner class in Java
// without parameter

import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {

        try {

            String s = "Gfg";

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

            scanner.close();

            // Prints the new line
            System.out.println(scanner.nextLine());
            scanner.close();
        }
        catch (Exception e) {
            System.out.println("Exception thrown: " + e);
        }
    }
}

Output:

Exception thrown: java.lang.IllegalStateException: Scanner closed

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#nextLine()