Java Scanner - hasNext() Method
The java.util.Scanner.hasNext() method returns true if the next token matches the pattern constructed from the specified string. The scanner does not advance past any input.
Syntax
public boolean hasNext(Pattern pattern)
Parameters
pattern |
Specify the pattern to scan for. |
Return Value
Returns true if the next token matches the specified pattern.
Exception
Throws IllegalStateException, if this scanner is closed.
Example:
In the example below, the java.util.Scanner.hasNext() method is used to check whether the next token matches the specified pattern or not.
import java.util.*;
public class MyClass {
public static void main(String[] args) {
//String to scan
String MyString = "Hello Cello Hullo Hallo Jello";
//creating a Scanner
Scanner MyScan = new Scanner(MyString);
while(MyScan.hasNext()) {
//print the next token if matches if specified pattern
if(MyScan.hasNext(".ello"))
System.out.println(MyScan.next(".ello"));
//else move to the next token
else
MyScan.next();
}
//close the scanner
MyScan.close();
}
}
The output of the above code will be:
Hello Cello Jello
❮ Java.util - Scanner
