import org.apache.commons.lang.StringUtils;
public class MainClass {
public static void main(String[] args) {
//Check if string contains only a specified set of characters. Return boolean
System.out.println("4) Check if 643287460 contains only 0123456789 >>>" +
StringUtils.containsOnly("643287460", "0123456789"));
}
}
4) Check if 643287460 contains only 0123456789 true