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Java Scanner useDelimiter() Method with Example

Scanner Class useDelimiter() method: Here, we are going to learn about the useDelimiter() method of Scanner Class with its syntax and example.
Submitted by Preeti Jain, on March 24, 2020

Scanner Class useDelimiter() method

Syntax:

    public Scanner skip(Pattern patt);
    public Scanner skip(String patt);

• useDelimiter() method is available in java.util package.
• useDelimiter(Pattern patt) method is used to put the delimiter pattern to the given pattern (patt) of this Scanner.
• useDelimiter(String patt) method is used to put the delimiter pattern to the pattern formed from the given string (patt) of this Scanner.
• These methods don’t throw an exception at the time of the set delimiter pattern.
• These are non-static methods and it is accessible with the class object only and if we try to access these methods with the class name then we will get an error.

Parameter(s):

• In the first case, useDelimiter(Pattern patt),
  • Pattern patt – represents the delimiter pattern.
• In the second case, useDelimiter(String patt),
  • String patt – represents a string denoting the delimiter pattern.

Return value:

In both the cases, the return type of the method is Scanner, it retrieves this Scanner object.

Example 1:

// Java program to demonstrate the example 
// of useDelimiter() method of Scanner

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

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

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

  // By using useDelimiter(Pattern) method
  // is to use delimiter set by the given
  // pattern
  sc.useDelimiter(Pattern.compile("IH--"));
  System.out.println("sc.useDelimiter(Pattern): " + sc.delimiter());

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

Output

sc.useDelimiter(Pattern): IH--

Example 2:

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

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

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

  // By using useDelimiter(String) method
  // is to use delimiter set by the given
  // string
  sc.useDelimiter("IH--");
  System.out.println("sc.useDelimiter(String): " + sc.delimiter());

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

Output

sc.useDelimiter(String): IH--