JAVA program to check given string is number or not

Video Link : ➽ https://youtu.be/KLVLYuDT2-o

Source program :

import java.util.Scanner;
class NumberValidation{
public static void main(String args[]){
String str ;
System.out.println("Enter String :");

Scanner sc = new Scanner(System.in);
str = sc.next();

boolean b = true;

try{
Double.parseDouble(str);
}catch(NumberFormatException ex){
b = false;
}

if(b){
System.out.println("\n\n Enter String is number ...");
}else{
System.out.println("\n\n Enter String is Not a number ...");
}
}
}