import javax.print.attribute.DocAttribute; //导入依赖的package包/类
public void testHashDocAttributeSet() {
    startTest("HashDocAttributeSet class testing...");

    DocAttributeSet set1 = new HashDocAttributeSet();
    DocAttributeSet set2 = 
        new HashDocAttributeSet(OrientationRequested.LANDSCAPE);
    DocAttributeSet set3 = new HashDocAttributeSet(set2);
    DocAttribute [] arr = {OrientationRequested.LANDSCAPE,
                           MediaName.NA_LETTER_WHITE};
    DocAttributeSet set4 = new HashDocAttributeSet(arr);
    Attribute [] attrArr;

    assertTrue(set1.isEmpty());
    assertFalse(set2.isEmpty());
    assertTrue(set3.equals(set2));
    assertFalse(set3.equals(set1));
    set3.clear();
    assertEquals(set3, set1);
    set3.add(OrientationRequested.LANDSCAPE);
    set3.add(MediaName.NA_LETTER_WHITE);
    assertTrue(set3.containsKey(OrientationRequested.LANDSCAPE.getClass()));
    assertFalse(set2.containsKey(MediaName.NA_LETTER_WHITE.getClass()));
    assertTrue(set3.containsValue(OrientationRequested.LANDSCAPE));
    assertFalse(set3.containsValue(OrientationRequested.PORTRAIT));
    assertFalse(set3.containsValue(PrintQuality.DRAFT));
    assertEquals(set1.size(), 0);
    assertEquals(set2.size(), 1);
    assertEquals(set3.size(), 2);
    assertTrue(set4.equals(set3));
    assertEquals(set3.get(OrientationRequested.PORTRAIT.getClass()),
                 OrientationRequested.LANDSCAPE);
    assertFalse((set3.get(OrientationRequested.PORTRAIT.getClass()))
            .equals(OrientationRequested.PORTRAIT));
    set1.addAll(set3);
    assertEquals(set3, set1);
    set1.remove(OrientationRequested.PORTRAIT.getClass());
    assertEquals(set1.size(), 1);
    attrArr = set1.toArray();
    assertEquals(attrArr.length, 1);
    assertEquals(attrArr[0], MediaName.NA_LETTER_WHITE);
}