Java Scanner toString() Method

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Description

The java Scanner toString() method returns the string representation of this Scanner. The string representation of a Scanner contains information that may be useful for debugging. The exact format is unspecified.

Declaration

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

public String toString()

Parameters

NA

Return Value

This method returns the string representation of this scanner

Exception

NA

Getting String Representation of a Scanner on a String Example

The following example shows the usage of Java Scanner toString() method to get the string representation of the scanner. We've created a scanner object using a given string. Then we print the string representation using toString() method. In the end scanner is closed using close() 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);
      
      System.out.println(scanner.toString());

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

Output

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

java.util.Scanner[delimiters=\p{javaWhitespace}+][position=0][match valid=false][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]

Getting String Representation of a Scanner on User Input Example

The following example shows the usage of Java Scanner toString() method to get the string representation of the scanner. We've created a scanner object using System.in class. Then we print the string representation using toString() method. In the end scanner is closed using close() 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);
      
      System.out.println(scanner.toString());
      
      // close the scanner
      scanner.close();
   }
}

Output

Let us compile and run the above program, this will produce the following result − (We've entered Hello World.)

java.util.Scanner[delimiters=\p{javaWhitespace}+][position=0][match valid=false][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]

Getting String Representation of a Scanner on Properties File Example

The following example shows the usage of Java Scanner toString() method to get the string representation of the scanner. We've created a scanner object using properties.txt iile. Then we print the string representation using toString() method. In the end scanner is closed using close() method.

package com.tutorialspoint;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

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

      // create a new scanner with a file as input
      Scanner scanner = new Scanner(new File("properties.txt"));
         
      System.out.println(scanner.toString());

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

Assuming we have a file properties.txt available in your CLASSPATH, with the following content. This file will be used as an input for our example program −

Hello World! 3 + 3.0 = 6

Output

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

java.util.Scanner[delimiters=\p{javaWhitespace}+][position=0][match valid=false][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]