Java Comparator.naturalOrder方法代碼示例

import java.util.Comparator; //導入方法依賴的package包/類
@Override
public int compare(T o1, T o2) {
  Comparable obj1 = null;
  Comparable obj2 = null;

  try {
    obj1 = (Comparable) PropertyUtils.getProperty(o1, this.propertyPath);
    obj2 = (Comparable) PropertyUtils.getProperty(o2, this.propertyPath);
  } catch (NestedNullException ignored) {
    // Ignored, als het property NULL is, dan vergelijken met NULL
  } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
    throw new IllegalArgumentException("Could not retrieve property " + this.propertyPath, e);
  }

  Comparator<Comparable<Object>> objectComparator = null;
  if ((obj1 != null && obj2 != null) && obj1 instanceof String) {
    obj1 = ((String) obj1).toLowerCase().trim();
    obj2 = ((String) obj2).toLowerCase().trim();

    if (!StringUtils.isEmpty((String) obj1) && !StringUtils.isEmpty((String) obj2)) {
      if (StringUtils.isNumeric((String) obj1) && StringUtils.isNumeric((String) obj2)) {
        objectComparator = Comparator.comparingDouble(o -> new Double(String.valueOf(o)));
      }
    }
  }

  if (objectComparator == null) {
    objectComparator = Comparator.naturalOrder();
  }

  //noinspection unchecked
  return Comparator.nullsLast(objectComparator).compare(obj1, obj2);
}
 

import java.util.Comparator; //導入方法依賴的package包/類
/**
 * Sort using natural order of {@literal <T>} which must be
 * {@code Comparable}.
 */
OfRef(AbstractPipeline<?, T, ?> upstream) {
    super(upstream, StreamShape.REFERENCE,
          StreamOpFlag.IS_ORDERED | StreamOpFlag.IS_SORTED);
    this.isNaturalSort = true;
    // Will throw CCE when we try to sort if T is not Comparable
    @SuppressWarnings("unchecked")
    Comparator<? super T> comp = (Comparator<? super T>) Comparator.naturalOrder();
    this.comparator = comp;
}
 

import java.util.Comparator; //導入方法依賴的package包/類
public void testComposeComparator() {
    // Longer string in front
    Comparator<String> first = (s1, s2) -> s2.length() - s1.length();
    Comparator<String> second = Comparator.naturalOrder();
    Comparator<String> composed = first.thenComparing(second);

    assertTrue(composed.compare("abcdefg", "abcdef") < 0);
    assertTrue(composed.compare("abcdef", "abcdefg") > 0);
    assertTrue(composed.compare("abcdef", "abcdef") == 0);
    assertTrue(composed.compare("abcdef", "ghijkl") < 0);
    assertTrue(composed.compare("ghijkl", "abcdefg") > 0);
}
 

import java.util.Comparator; //導入方法依賴的package包/類
private Comparator<Course> createCourseComparator (String sortType) {
    if(sortType.equalsIgnoreCase("descending")) {
        return Comparator.reverseOrder();
    } else if (sortType.equalsIgnoreCase("ascending")) {
        return Comparator.naturalOrder();
    } else {
        throw  new InvalidInputException(this.getInput());
    }
}
 

import java.util.Comparator; //導入方法依賴的package包/類
public static <T extends Comparable<T>> RelativeComparator<T> create() {
  return new RelativeComparator<T>(Comparator.naturalOrder());
}
 

import java.util.Comparator; //導入方法依賴的package包/類
public void testNaturalOrderComparator() {
    Comparator<String> comp = Comparator.naturalOrder();

    assertComparisons(stringValues, comp, comparisons);
}
 

import java.util.Comparator; //導入方法依賴的package包/類
/**
 * Ctor.
 *
 * <p>If you're using this ctor you must be sure that type {@code T}
 * implements {@link Comparable} interface. Otherwise, there will be
 * a type casting exception in runtime.</p>
 *
 * @param src The underlying collection
 */
@SuppressWarnings("unchecked")
public Sorted(final Iterable<T> src) {
    this(
        (Comparator<T>) Comparator.naturalOrder(),
        new CollectionOf<>(src)
    );
}
 

import java.util.Comparator; //導入方法依賴的package包/類
/**
 * Ctor.
 *
 * <p>If you're using this ctor you must be sure that type {@code T}
 * implements {@link Comparable} interface. Otherwise, there will be
 * a type casting exception in runtime.</p>
 *
 * @param src The underlying collection
 */
@SuppressWarnings("unchecked")
public Sorted(final Iterable<T> src) {
    this((Comparator<T>) Comparator.naturalOrder(), new ListOf<>(src));
}
 

import java.util.Comparator; //導入方法依賴的package包/類
/**
 * Ctor.
 *
 * <p>If you're using this ctor you must be sure that type {@code T}
 * implements {@link Comparable} interface. Otherwise, there will be
 * a type casting exception in runtime.</p>
 *
 * @param src The underlying iterable
 */
@SuppressWarnings("unchecked")
public Sorted(final Iterable<T> src) {
    this((Comparator<T>) Comparator.naturalOrder(), src);
}
 

import java.util.Comparator; //導入方法依賴的package包/類
/**
 * Ctor.
 *
 * <p>If you're using this ctor you must be sure that type {@code T}
 * implements {@link Comparable} interface. Otherwise, there will be
 * a type casting exception in runtime.</p>
 *
 * @param items The underlying iterator
 */
@SuppressWarnings("unchecked")
public Sorted(final Iterator<T> items) {
    this((Comparator<T>) Comparator.naturalOrder(), items);
}
 

import java.util.Comparator; //導入方法依賴的package包/類
/**
 * Convenience function to convert an array to a sorted list.
 *
 * @param <T> The array member type.
 * @param array The array to convert.
 * @return A list of the stream contents.
 */
public static <T extends Comparable<? super T>> List<T> sort(T[] array) {
    final Comparator<T> comparator = Comparator.naturalOrder();
    return sort_internal(Arrays.stream(array), comparator);
}