- Java.util Package Classes
- Java.util - Home
- Java.util - ArrayDeque
- Java.util - ArrayList
- Java.util - Arrays
- Java.util - BitSet
- Java.util - Calendar
- Java.util - Collections
- Java.util - Currency
- Java.util - Date
- Java.util - Dictionary
- Java.util - EnumMap
- Java.util - EnumSet
- Java.util - Formatter
- Java.util - GregorianCalendar
- Java.util - HashMap
- Java.util - HashSet
- Java.util - Hashtable
- Java.util - IdentityHashMap
- Java.util - LinkedHashMap
- Java.util - LinkedHashSet
- Java.util - LinkedList
- Java.util - ListResourceBundle
- Java.util - Locale
- Java.util - Observable
- Java.util - PriorityQueue
- Java.util - Properties
- Java.util - PropertyPermission
- Java.util - PropertyResourceBundle
- Java.util - Random
- Java.util - ResourceBundle
- Java.util - ResourceBundle.Control
- Java.util - Scanner
- Java.util - ServiceLoader
- Java.util - SimpleTimeZone
- Java.util - Stack
- Java.util - StringTokenizer
- Java.util - Timer
- Java.util - TimerTask
- Java.util - TimeZone
- Java.util - TreeMap
- Java.util - TreeSet
- Java.util - UUID
- Java.util - Vector
- Java.util - WeakHashMap
- Java.util Package Extras
- Java.util - Interfaces
- Java.util - Exceptions
- Java.util - Enumerations
- Java.util Useful Resources
- Java.util - Useful Resources
- Java.util - Discussion
Java Scanner hasNextInt() Method
Description
The Java Scanner hasNextInt() method returns true if the next token in this scanner's input can be interpreted as an int value in the default radix using the nextInt() method. The scanner does not advance past any input.
Declaration
Following is the declaration for java.util.Scanner.hasNextInt() method
public boolean hasNextInt()
Parameters
NA
Return Value
This method returns true if and only if this scanner's next token is a valid int value
Exception
IllegalStateException − if this scanner is closed
Java Scanner hasNextInt(int radix) Method
Description
The java.util.Scanner.hasNextInt(int radix) method returns true if the next token in this scanner's input can be interpreted as an int value in the specified radix using the nextInt() method. The scanner does not advance past any input.
Declaration
Following is the declaration for java.util.Scanner.hasNextInt() method
public boolean hasNextInt(int radix)
Parameters
radix − the radix used to interpret the token as an int value
Return Value
This method returns true if and only if this scanner's next token is a valid int value
Exception
IllegalStateException − if this scanner is closed
Checking Next Token as Int Using Scanner on a String Example
The following example shows the usage of Java Scanner hasNextInt() method to check if next token is a Int using a default radix. We've created a scanner object using a given string. Then we checked each token to be Int and printed. 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); while (scanner.hasNext()) { // check if the scanner's next token is an Int System.out.println("" + scanner.hasNextInt()); // print what is scanned System.out.println("" + scanner.next()); } // close the scanner scanner.close(); } }
Output
Let us compile and run the above program, this will produce the following result −
false Hello false World! true 3 false + false 3.0 false = true 6
Checking Next Token as Int with Radix 4 Using Scanner on a String Example
The following example shows the usage of Java Scanner hasNextInt() method to check if next token is a Int using a radix of 4. We've created a scanner object using a given string. Then we checked each token to be Int and printed. 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); while (scanner.hasNext()) { // check if the scanner's next token is an Int System.out.println("" + scanner.hasNextInt(4)); // print what is scanned System.out.println("" + scanner.next()); } // close the scanner scanner.close(); } }
Output
Let us compile and run the above program, this will produce the following result −
false Hello false World! true 3 false + false 3.0 false = false 6
Checking Next Token as Int Using Scanner on User Input Example
The following example shows the usage of Java Scanner hasNextInt() method to check if next token is a Int. We've created a scanner object using System.in class. Then we checked each token to be Int and printed. 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 System Input Scanner scanner = new Scanner(System.in); // check if the scanner's next token is a Int if(scanner.hasNextInt()){ // print what is scanned System.out.println(scanner.next()); } else { scanner.next(); } // close the scanner scanner.close(); } }
Output
Let us compile and run the above program, this will produce the following result − (where we've entered 3.0.)
3 3
To Continue Learning Please Login
Login with Google