- Java.util Package Classes
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- Java.util Package Extras
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- Java.util - Discussion
Java Scanner nextLong() Method
Description
The Java Scanner nextLong() method scans the next token of the input as a long.An invocation of this method of the form nextLong() behaves in exactly the same way as the invocation nextLong(radix), where radix is the default radix of this scanner.
Declaration
Following is the declaration for java.util.Scanner.nextLong() method
public long nextLong()
Parameters
NA
Return Value
This method returns the long scanned from the input
Exception
InputMismatchException − if the next token does not match the Longeger regular expression, or is out of range
NoSuchElementException − if input is exhausted
IllegalStateException − if this scanner is closed
Java Scanner nextLong(int radix) Method
Description
The Java Scanner nextLong(int radix) method scans the next token of the input as a long. This method will throw InputMismatchException if the next token cannot be translated into a valid long value as described below. If the translation is successful, the scanner advances past the input that matched.
Declaration
Following is the declaration for java.util.Scanner.nextLong() method
public long nextLong(int radix)
Parameters
radix − the radix used to interpret the token as an int value
Return Value
This method returns the long scanned from the input
Exception
InputMismatchException − if the next token does not match the Longeger regular expression, or is out of range
NoSuchElementException − if input is exhausted
IllegalStateException − if this scanner is closed
Java Scanner nextLong(int radix) Method
Description
The java.util.Scanner.nextLong(int radix) method scans the next token of the input as an int. This method will throw InputMismatchException if the next token cannot be translated into a valid int value as described below. If the translation is successful, the scanner advances past the input that matched.
Declaration
Following is the declaration for java.util.Scanner.nextLong(int radix) method
public int nextLong(int radix)
Parameters
radix − the radix used to interpret the token as an int value
Return Value
This method returns the int scanned from the input
Exception
InputMismatchException − if the next token does not match the Longeger regular expression, or is out of range
NoSuchElementException − if the input is exhausted
IllegalStateException − if this scanner is closed
Getting Next Token as Long of a Scanner on a String Example
The following example shows the usage of Java Scanner nextLong() method to scan the next token as Long with default radix. We've created a scanner object using a given string. Then we checked each token to be Long and printed otherwise Not Found is printed along with scanned token. 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 "; Long l = 13964599874l; s = s + l; // 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 a Long if(scanner.hasNextLong()){ // print what is scanned System.out.println("Found: " + scanner.nextLong()); } else { System.out.println("Not Found: " + scanner.next()); } } // close the scanner scanner.close(); } }
Output
Let us compile and run the above program, this will produce the following result −
Not Found: Hello Not Found: World! Found: 3 Not Found: + Not Found: 3.0 Not Found: = Found: 6 Found: 13964599874
Getting Next Token as Long with Radix of a Scanner on a String Example
The following example shows the usage of Java Scanner nextLong() method to scan the next token as Long with given radix. We've created a scanner object using a given string. Then we checked each token to be Long and printed otherwise Not Found is printed along with scanned token. 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"; Long l = 13964599874l; s = s + l; // 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 a Long if(scanner.hasNextLong(4)){ // print what is scanned System.out.println("Found: " + scanner.nextLong(4)); } else { System.out.println("Not Found: " + scanner.next()); } } // close the scanner scanner.close(); } }
Output
Let us compile and run the above program, this will produce the following result −
Not Found: Hello Not Found: World! Found: 3 Not Found: + Not Found: 3.0 Not Found: = Not Found: 6 Not Found: 13964599874
Getting Next Token as Long of a Scanner on User Input Example
The following example shows the usage of Java Scanner nextLong() method to scan the next token as Long with given radix. We've created a scanner object using System.in class. Then we checked each token to be Long and printed otherwise Not Found is printed along with scanned token. 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 Long if(scanner.hasNextLong()){ // print what is scanned System.out.println("Found: " + scanner.nextLong()); } else { System.out.println("Not Found: " + 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)
13964599874 Found: 13964599874
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