Java Scanner - hasNextBoolean() Method
The java.util.Scanner.hasNextBoolean() method returns true if the next token in the scanner's input can be interpreted as a boolean value using a case insensitive pattern created from the string "true|false". The scanner does not advance past any input.
Syntax
public boolean hasNextBoolean()
Parameters
No parameter is required.
Return Value
Returns true if and only if the scanner's next token is a valid boolean value.
Exception
Throws IllegalStateException, if the scanner is closed.
Example:
In the example below, the java.util.Scanner.hasNextBoolean() method is used to check whether the scanner's next token is a valid boolean value or not.
import java.util.*;
public class MyClass {
public static void main(String[] args) {
//String to scan
String MyString = "Hello World 10 == 20 returns false";
//creating a Scanner
Scanner MyScan = new Scanner(MyString);
while(MyScan.hasNext()) {
//check if the next token is a boolean
//if yes, prints boolean value
if(MyScan.hasNextBoolean())
System.out.println("Boolean value is: "+ MyScan.nextBoolean());
//if the next token is not a boolean
else
System.out.println("No Boolean Value found: "+ MyScan.next());
}
//close the scanner
MyScan.close();
}
}
The output of the above code will be:
No Boolean Value found: Hello No Boolean Value found: World No Boolean Value found: 10 No Boolean Value found: == No Boolean Value found: 20 No Boolean Value found: returns Boolean value is: false
❮ Java.util - Scanner
