- Java.util Package Classes
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- Java.util - Scanner
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- Java.util Useful Resources
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- Java.util - Discussion
Java Scanner findWithinHorizon() Method
Description
The Java Scanner findWithinHorizon(Pattern pattern,int horizon) method Attempts to find the next occurrence of the specified pattern. This method searches through the input up to the specified search horizon, ignoring delimiters. If the pattern is found the scanner advances past the input that matched and returns the string that matched the pattern. If no such pattern is detected then the null is returned and the scanner's position remains unchanged. This method may block waiting for input that matches the pattern. A scanner will never search more than horizon code points beyond its current position. Note that a match may be clipped by the horizon; that is, an arbitrary match result may have been different if the horizon had been larger.
Declaration
Following is the declaration for java.util.Scanner.findWithinHorizon(Pattern pattern,int horizon) method
public String findWithinHorizon(Pattern pattern,int horizon)
Parameters
pattern − a string specifying the pattern to search for
Return Value
This method returns the text that matched the specified pattern.
Exception
IllegalStateException − if this scanner is closed
IllegalArgumentException − if horizon is negative
Java Scanner findWithinHorizon(String pattern, int horizon) Method
Description
The Java Scanner findWithinHorizon(String pattern,int horizon) method attempts to find the next occurrence of a pattern constructed from the specified string, ignoring delimiters.An invocation of this method of the form findWithinHorizon(pattern) behaves in exactly the same way as the invocation findWithinHorizon(Pattern.compile(pattern, horizon)).
Declaration
Following is the declaration for java.util.Scanner.findWithinHorizon() method
public String findWithinHorizon(String pattern,int horizon)
Parameters
pattern − a string specifying the pattern to search for
Return Value
This method returns the text that matched the specified pattern.
Exception
IllegalStateException − if this scanner is closed
IllegalArgumentException − if horizon is negative
Finding Next Token with Help of a Pattern Using Scanner On a String Example
The following example shows the usage of Java Scanner findWithinHorizon(Pattern pattern, int horizon) method to find the next occurrence of pattern in a given string. We've created a scanner object using a given string. Then using findWithinHorizon(pattern, horizon) to search a string within horion of 10 and then a pattern is searched in horizon of 20. Then we've printed the rest of the string.
package com.tutorialspoint; import java.util.Scanner; import java.util.regex.Pattern; 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); // find a pattern of 2 letters before rld, with horizon of 10 System.out.println(scanner.findWithinHorizon(Pattern.compile("..rld"), 10)); // find a pattern of 2 letters before rld, with horizon of 20 System.out.println(scanner.findWithinHorizon(Pattern.compile("..rld"), 20)); // print the rest of the string System.out.println(scanner.nextLine()); // close the scanner scanner.close(); } }
Output
Let us compile and run the above program, this will produce the following result −
null World ! 3 + 3.0 = 6
Finding Next Token with Help of a String pattern Using Scanner On a String Example
The following example shows the usage of Java Scanner findWithinHorizon(String pattern, int horizon) method to find the next occurrence of pattern in a given string. We've created a scanner object using a given string. Then using findWithinHorizon(pattern, horizon) to search a string within horion of 10 and then a pattern is searched in horizon of 20. Then we've printed the rest of the string.
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); // find a string of world, with horizon of 10 System.out.println(scanner.findWithinHorizon("World", 10)); // find a string of world, with horizon of 20 System.out.println(scanner.findWithinHorizon("World", 20)); // print the rest of the string System.out.println(scanner.nextLine()); // close the scanner scanner.close(); } }
Output
Let us compile and run the above program, this will produce the following result −
null World ! 3 + 3.0 = 6
Finding Next Token with Help of a String Pattern Using Scanner On User Input Example
The following example shows the usage of Java Scanner findWithinHorizon(String pattern, int horizon) method to find the next occurrence of pattern in a given input. We've created a scanner object using System.in class. Then using findWithinHorizon(pattern, horizon) to search a string within horion of 10 and then a pattern is searched in horizon of 20.
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 System input Scanner scanner = new Scanner(System.in); // find a string of world, with horizon of 10 System.out.println(scanner.findWithinHorizon("World", 10)); // find a string of world, with horizon of 20 System.out.println(scanner.findWithinHorizon("World", 20)); // close the scanner scanner.close(); } }
Output
Let us compile and run the above program, this will produce the following result − (where we've entered Hello World and pressed enter key.)
Hello World null World
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