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Java Scanner findInLine() Method with Example

Scanner Class findInLine() method: Here, we are going to learn about the findInLine() method of Scanner Class with its syntax and example.
Submitted by Preeti Jain, on March 26, 2020

Scanner Class findInLine() method

Syntax:

    public String findInLine(Pattern patt);
    public String findInLine(String patt);

• findInLine() method is available in java.util package.
• findInLine(Pattern patt) method is used to get the string that meets the given pattern (Pattern).
• findInLine(String patt) method is used to get the string that meets the given String (patt).
• These methods may throw an exception at the time of returning pattern.
  IllegalStateException: This exception may throw when this Scanner is not opened.
• These are non-static methods, it is accessible with class object & if we try to access these methods with the class name then we will get an error.

Parameter(s):

• In the first case, findInLine(Pattern patt),
  • Pattern patt – represents the pattern to find for.
• In the second case, findInLine(String patt),
  • String patt – represents the string denotes the pattern to find for.

Return value:

In both the cases, the return type of the method is String, it returns the message that meets the given pattern.

Example:

// Java program is to demonstrate the
// example of findInLine

import java.util.*;
import java.util.*;
import java.util.regex.*;

public class FindInLine {
 public static void main(String[] args) {
  String str = "Java Programming! 3 * 8= 24";

  // Instantiates Scanner
  Scanner sc = new Scanner(str);

  // By using findInLine(Pattern) method
  // is to find the next pattern from the given
  // parameter ".Program"
  String pattern = sc.findInLine(Pattern.compile(".Program"));
  System.out.println("sc.findInLine(Pattern.compile(.Program)): " + pattern);

  // By using findInLine(string) method
  // is to find the next pattern from the given
  // parameter of string "Java"

  pattern = sc.findInLine("ava");
  System.out.println("sc.findInLine(ava): " + pattern);

  // Scanner closed
  sc.close();
 }
}

Output

sc.findInLine(Pattern.compile(.Program)):  Program
sc.findInLine(ava): null