public static void tiskniPoleDoSloupcu(Clovek[] a){
    System.out.format("%1$-8s %2$-8s","Jmeno", "Prijmeni");
    System.out.println("");

    for(int i = 0; i<a.length; i++){
        System.out.format("%1$-8s %2$-8s",a[i].jmeno, a[i].prijmeni);
        System.out.println("");
    }

    System.out.println();
}