Java Scanner findInLine() Method

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Description

The Java Scanner findInLine(Pattern pattern) method attempts to find the next occurrence of the specified pattern ignoring delimiters. If the pattern is found before the next line separator, the scanner advances past the input that matched and returns the string that matched the pattern. If no such pattern is detected in the input up to the next line separator, then null is returned and the scanner's position is unchanged. This method may block waiting for input that matches the pattern.

Declaration

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

public String findInLine(Pattern pattern)

Parameters

pattern − the pattern to scan for

Return Value

This method returns the text that matched the specified pattern.

Exception

IllegalStateException − if this scanner is closed

Java Scanner findInLine(String pattern) Method

Description

The java Scanner findInLine(String pattern) method attempts to find the next occurrence of a pattern constructed from the specified string, ignoring delimiters.

Declaration

Following is the declaration for java.util.Scanner.findInLine(String pattern) method

public String findInLine(String pattern)

Parameters

pattern − a string specifying the pattern to search for

Return Value

This method returns the text that matched the specified pattern.

Exception

IllegalStateException − if this scanner is closed

Finding a pattern within the Line Using Scanner Example

The following example shows the usage of Java Scanner findInLine(Pattern pattern) method to find the next occurrence of pattern in a given string. We've created a scanner object using a given string. We've printed the word containing a given pattern using findInLine() method. Then we printed the string using scanner.nextLine() method.

package com.tutorialspoint;

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

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

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

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

      // find a pattern of any letter plus "ello"
      System.out.println(scanner.findInLine(Pattern.compile(".ello")));

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

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

Output

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

Hello
 World! 3 + 3.0 = 6

Finding a String within the Line Using Scanner Example

The following example shows the usage of Java Scanner findInLine(String pattern) method to find the next occurrence of pattern in a given string. We've created a scanner object using a given string. We've printed the word containing a given pattern using findInLine() method. Then we printed the string using scanner.nextLine() method.

package com.tutorialspoint;

import java.util.Scanner;

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

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

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

      // find a string "World"
      System.out.println(scanner.findInLine("World"));

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

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

Output

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

World
! 3 + 3.0 = 6

Finding a pattern with the Line Using Scanner on User Input Example

The following example shows the usage of Java Scanner findInLine(String pattern) method to find the next occurrence of matched result of pattern in an input. We've created a scanner object using System.in class. We checked the word World using findInLine(String) 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);

      // find a string "World"
      System.out.println(scanner.findInLine("World"));

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

      // 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 key.)

Hello World
World