public void setSticky(final boolean sticky) {
        this.sticky = sticky;
    }
@Test
    public void testSetSticky() {
        assertTrue(new Permission(1755).isSticky());
        assertTrue(new Permission(3755).isSticky());
        assertTrue(new Permission(5755).isSticky());
        assertFalse(new Permission(2755).isSticky());
        assertFalse(new Permission(6755).isSticky());
        assertEquals("1000", new Permission(1000).getMode());
        assertEquals("--------T", new Permission(1000).getSymbol());
    }