The java.lang.String class gives a considerable measure of methods to deal with a string. By the assistance of these methods, one can perform operations on the string like trimming, concatenating, converting and comparing. We can extract the numbers from a given string by using the replaceAll() method of a String class.
Example
import java.util.Scanner; public class StringExtractTest { public static void main(String[] args) { String input; String numbers; Scanner scanner = new Scanner(System.in); System.out.print(" Please enter a string from the keyboard that contains numbers: "); input = scanner.nextLine(); numbers = input.replaceAll("[^0-9]", ""); System.out.println("The Numbers are: " + numbers); } }
Output
Please enter a string from the keyboard that contains numbers: Welcome to Tutorials Point 1234567890 The Numbers are: 1234567890