Java Utility Library

Java Scanner - hasNextFloat() Method



The java.util.Scanner.hasNextFloat() method returns true if the next token in the scanner's input can be interpreted as a float value using the nextFloat() method. The scanner does not advance past any input.

Syntax

public boolean hasNextFloat()

Parameters

No parameter is required.

Return Value

Returns true if and only if the scanner's next token is a valid float value.

Exception

Throws IllegalStateException, if the scanner is closed.

Example:

In the example below, the java.util.Scanner.hasNextFloat() method is used to check whether the scanner's next token is a valid float value or not.

import java.util.*;

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

    //String to scan
    String MyString = "Hello World 10 + 20 = 30.0";

    //creating a Scanner
    Scanner MyScan = new Scanner(MyString);

    while(MyScan.hasNext()) {
      //check if the next token is a float
      //if yes, prints float value
      if(MyScan.hasNextFloat())
        System.out.println("Float value is: "+ MyScan.nextFloat());
      //if the next token is not a float
      else
        System.out.println("No Float Value found: "+ MyScan.next());
    }

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

The output of the above code will be:

No Float Value found: Hello
No Float Value found: World
Float value is: 10.0
No Float Value found: +
Float value is: 20.0
No Float Value found: =
Float value is: 30.0

❮ Java.util - Scanner