/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static void main(String[] args) throws Exception
    {
 
      String str;
      String numbers;
 
      Scanner SC=new Scanner(System.in);
 
      System.out.print("Enter string that contains numbers: ");
      str=SC.nextLine();
 
      //extracting string
      numbers=str.replaceAll("[^0-9. ]", "");
 
      System.out.println("Numbers are: " + numbers);
    }
}

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r ( 4.5, 1.0 ) 10.5 7