Cadenas

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package cadenas;
import java.util.Scanner;
import java.io.IOException;
/**
 *
 * @author JesseKislev
 */
public class Cadenas {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)throws IOException {

        Scanner leer = new Scanner(System.in);

        String x, y;
        String w="123";

        System.out.println("Ingresa una cadena");
        x = leer.nextLine();

        for(int x1=0; x1<x.length(); x1++){
            char b = x.charAt(x1);
            for(int z=0; z<w.length(); z++){
                char a = w.charAt(z);
                if(a==b){
                    System.out.println(b);
                }
            }
        }


    }

}