Scanner skip(Pattern) in Java

skip(Pattern): This method is available in java.util.Scanner class of Java.

Syntax:

Scanner java.util.Scanner.skip(Pattern pattern)

This method takes one argument. This method skips input that matches the specified pattern, ignoring delimiters.

Parameters: One parameter is required for this method.

pattern: a string specifying the pattern to skip over.

Returns: this scanner.

Throws:

1. NoSuchElementException - if the specified pattern is not found.

2. IllegalStateException - if this scanner is closed

Approach 1: When no exception

Java

import java.util.Scanner;
import java.util.regex.Pattern;

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

        String source = "Hello World";
        Scanner scanner = new Scanner(source);

        Pattern pattern = Pattern.compile("...lo");
        System.out.println(scanner.skip(pattern));
        scanner.close();
    }
}

Output:

java.util.Scanner[delimiters=\p{javaWhitespace}+][position=5][match valid=true][need input=false][source closed=false][skipped=false][group separator=\x{2c}][decimal separator=\x{2e}][positive prefix=][negative prefix=\Q-\E][positive suffix=][negative suffix=][NaN string=\QNaN\E][infinity string=\Q∞\E]

Approach 2: NoSuchElementException 

Java

import java.util.Scanner;
import java.util.regex.Pattern;

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

        String source = "Hello World";
        Scanner scanner = new Scanner(source);

        Pattern pattern = Pattern.compile("...loo");
        System.out.println(scanner.skip(pattern));
        scanner.close();
    }
}

Output:

Exception in thread "main" java.util.NoSuchElementException
	at java.base/java.util.Scanner.skip(Scanner.java:1843)
	

Approach 3: IllegalStateException

Java

import java.util.Scanner;
import java.util.regex.Pattern;

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

        String source = "Hello World";
        Scanner scanner = new Scanner(source);

        Pattern pattern = Pattern.compile("...lo");

        scanner.close();
        System.out.println(scanner.skip(pattern));

    }
}

Output:

Exception in thread "main" java.lang.IllegalStateException: Scanner closed
	at java.base/java.util.Scanner.ensureOpen(Scanner.java:1150)
	at java.base/java.util.Scanner.skip(Scanner.java:1827)