Eine Klasse für Sammler

import java.util.*;

public class Lister {
	
	public List<String> fillList() {
		
	 java.util.Scanner userInput = new java.util.Scanner(System.in);
	
	 List<String> collected = new LinkedList<String>();
     String next = "na";
     
	while (userInput.hasNext()) {
		next = userInput.next();
		
		 
		 collected.add(next);
		 
		 if (next.contentEquals("ende")) {
			 
			 break;
		 }
	 }

	 
	 System.out.println(collected);
	 System.out.println(collected.size());
	 

	userInput.close();
   return collected;

  }
	public int countListItems(List<String> list) {
		int i =0;
		
		i=list.size();
		
		return i;
		
	}
	public int countListItems(List<String> list, String type) {
		int i =0;
		
		i=list.size();
		
		if (type.contentEquals("num")) {	
			i=i - countListStrings(list);
		}
		if (type.contentEquals("str")) {
			i=countListStrings(list);
		}
		
		return i;
		
	}
	public int countListStrings(List<String> list) {
	 int i =0;
	 int is =0;
	  while (i < list.size()) {
		  
		String  next=list.get(i);
		
		 if (!next.matches("\\d+(\\.\\d+)?")) {
			 
			 is++;
			 
		 }
		 i++;		  
	  }
	 
	 return is;
	
	}
	
	public Double[] getNumberArray(List<String> list) {
		
		int size=countListItems(list,"num");
		
		Double[] NumberArray = new Double[size];
		
		int i=0;
		
		while (i < size) {
			String  next=list.get(i);
			
			if (next.matches("\\d+(\\.\\d+)?")) {
				NumberArray[i]=Double.parseDouble(next);
				
			}
			i++;
		}
		
		System.out.println(NumberArray.length);
		
		return NumberArray;
		
		
	}
	
	
}
  
  

Anwendung:

  	public static void main(String[] args) {
		
		System.out.println("Hallo Leute");
	  
		Lister list=new Lister();
		
	List<String> flist=list.fillList();
		
		System.out.println("Total Items:  "+list.countListItems(flist));
		
		System.out.println("Strings:  "+list.countListStrings(flist));
		
		System.out.println("Numbers:  "+list.countListItems(flist,"num"));
		
		System.out.println("Array:  "+list.getNumberArray(flist).length);
	}