Java Scanner findInLine() Method

The findInLine() is a Java Scanner class method which is used to find the next occurance of a pattern. There is two different types of Java findInLine() method which can be differentiated depending on its parameter. These are:

Java Scanner findInLine(String pattern) Method
Java Scanner findInLine(Pattern pattern) Method

findInLine(String pattern) Method:

This is a Java Scanner class method which is used to find the next occurrence of a pattern constructed from the specified string, ignoring delimiters.

findInLine(Pattern pattern) Method:

This is an inbuilt method of Java Scanner class which is used to find the next occurrence of the specified pattern ignoring delimiters.

Syntax

Following is the declaration of findInLine() method:

public String findInLine(String pattern)
public String findInLine(Pattern pattern)

Parameter

DataType	Parameter	Description	Required/Optional
String	pattern	It is a string specifying the pattern to search for	Required
Pattern	pattern	It is the pattern to scan for	Required

Returns

The findInLine() method returns the text that matched the specified pattern.

Exceptions

IllegalStateException- This method throws exception if the innvocation is done after the scanner has been closed.

Compatibility Version

Java 1.5 and above

Example 1

import java.util.Scanner;  
public class ScannerFindInLineExample1{  
   public static void main(String args[]){ 
	   String str = "Hello World!";
	      //Create a new scanner Object
	      Scanner scanner = new Scanner(str);
	      //Find a string "World"
	      System.out.println("Output: " + scanner.findInLine("World"));
	      //Print the rest of the string
	      System.out.println("Left String: " + scanner.nextLine());
	      scanner.close();
   }  
}

Output:

Output: World
Left String: !

Example 2

import java.util.Scanner;  
public class ScannerFindInLineExample2{  
   public static void main(String args[]){ 
	   String str = "Hello World!";
	      //Create a new scanner Object
	      Scanner scanner = new Scanner(str);	      
	      scanner.close();
	    //Find a string "World"
	      System.out.println("Output: " + scanner.findInLine(""));
	      //Print the rest of the string
	      System.out.println("Left String: " + scanner.nextLine());
   }  
}

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.findInLine(Scanner.java:1699)
	at java.base/java.util.Scanner.findInLine(Scanner.java:1677)
	at myPackage.ScannerFindInLineExample2.main(ScannerFindInLineExample2.java:10)

Example 3

import java.util.Scanner;
import java.util.regex.Pattern;  
public class ScannerFindInLineExample3{  
      public static void main(String args[]){ 
	      String str = "Hello World! Hello India! ";
	      //Create a new scanner Object
	      Scanner scanner = new Scanner(str);
	      //Find a pattern of any letter plus "ello"
	      System.out.println("Output: "+scanner.findInLine(Pattern.compile(".ello")));
	      //Print the next line of the string
	      System.out.println("Left String: " + scanner.nextLine());
	      //Close the scanner
	      scanner.close();
      }  
}

Output:

Output: Hello
Left String:  World! Hello India!

Example 4

import java.util.*;
import java.util.regex.Pattern;  
public class ScannerFindInLineExample4{  
   public static void main(String args[]){ 
	   Scanner scan = new Scanner(System.in);
	   String userName;  
	   System.out.print("Enter your email address: ");
	   userName = scan.findInLine(Pattern.compile("[a-z]+"));
	   System.out.println("Output:"+userName);
	   scan.close();
   }  
}

Output:

Enter your email address: [email protected]
Output:rahul

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