TombSor

public class TombSor implements Sor {
    public int[] tomb;
    public int ptr;

    public TombSor() {
        tomb = new int[ 100 ];
        ptr = 0;
    }

    public TombSor( int size ) {
        if( size < 0 ) {
            tomb = new int[ 100 ];
        }
        else {
            tomb = new int[ size ];
        }
        ptr = 0;
    }

    public boolean isUres() {
        if( ptr == 0 ) {
            return true;
        }
        return false;
    }

    public int kivesz() {
        int tmp;
        if( isUres() ) {
            System.out.println( "Nincs mit kivenni, a sor ures!" );
            return 0;
        }
        tmp = tomb[ ptr - 1 ];
        tomb[ --ptr ] = 0;
        return tmp;
    }

    public void betesz( int num ) {
        if( ptr == tomb.length ) {
            tomb = Arrays.copyOf( tomb , tomb.length * 2 );
        }
        tomb[ ptr ] = num;
        ++ptr;
    }
}