Examples of java.util.Comparator.compare()

java.util.Comparator.compare()
Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.
In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive.
The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.)
The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0.
Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z.
It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." @param o1 the first object to be compared. @param o2 the second object to be compared. @return a negative integer, zero, or a positive integer as thefirst argument is less than, equal to, or greater than the second. @throws ClassCastException if the arguments' types prevent them frombeing compared by this comparator.

    SearchHit h1 = new SearchHit(null, "", "", "", "", new Date(123), 0.5F);
    SearchHit h2 = new SearchHit(null, "", "", "", "", new Date(321), 0.3F);


    assertTrue(comp.compare(h1, h1) == 0);
    assertTrue(comp.compare(h1, h2) != 0);
    assertTrue(comp.compare(h1, h2) < 0);
    assertTrue(comp.compare(h2, h1) > 0);
  }


}

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    SearchHit h2 = new SearchHit(null, "", "", "", "", new Date(321), 0.3F);


    assertTrue(comp.compare(h1, h1) == 0);
    assertTrue(comp.compare(h1, h2) != 0);
    assertTrue(comp.compare(h1, h2) < 0);
    assertTrue(comp.compare(h2, h1) > 0);
  }


}

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          return _compare(value1.toString(), value2.toString());
        }
      }
      else
      {
        return comparator.compare(value1, value2);
      }
    }


    private int _compare(
      String s1,

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        currentValue = getText(current, null);
      else
        currentValue = getValue(current, null);
      if (value == null)
        value = currentValue;
      else if (0 != comparatorToUse.compare(currentValue, value)) {
        value = null;
        break;
      }
    }
    if (value == null && useMultipleValue) {

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        // iterate over all comparators in the chain
        Iterator comparators = comparatorChain.iterator();
        for (int comparatorIndex = 0; comparators.hasNext(); ++comparatorIndex) {


            Comparator comparator = (Comparator) comparators.next();
            int retval = comparator.compare(o1,o2);
            if (retval != 0) {
                // invert the order if it is a reverse sort
                if (orderingBits.get(comparatorIndex) == true) {
                    retval *= -1;
                }

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        // =====================================================================
        //   Test Expectations
        // =====================================================================
        Comparator comparator = createComparator();
        int result = comparator.compare(normalPriorityHighSpecificityMock,
                                        normalPriorityLowSpecificityMock);
        assertEquals("Comparator result", GREATER_THAN, result);
    }


    /**

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        // =====================================================================
        //   Test Expectations
        // =====================================================================
        Comparator comparator = createComparator();
        int result = comparator.compare(importantPriorityLowSpecificityMock, 
                normalPriorityLowSpecificityMock);
        assertEquals("Comparator result", expectedResult, result);
    }


    /**

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    Object o1 = filteredModel.getValueAt(row1, column);
    Object o2 = filteredModel.getValueAt(row2, column);


    Comparator comparator = columnComparators[column];
    if (comparator != null) {
      return comparator.compare(o1, o2);
    }


    return COMPARABLE_COMPARATOR.compare(o1, o2);
  }

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        Object[] tree = heap.elements;
        for (int i = 1; i <= heap.size; i++) {
            Object parent = tree[i];
            if (i * 2 <= heap.size) {
                assertTrue("Parent is less than or equal to its left child", c.compare(parent, tree[i * 2]) <= 0);
            }
            if (i * 2 + 1 < heap.size) {
                assertTrue("Parent is less than or equal to its right child", c.compare(parent, tree[i * 2 + 1]) <= 0);
            }
        }

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            Object parent = tree[i];
            if (i * 2 <= heap.size) {
                assertTrue("Parent is less than or equal to its left child", c.compare(parent, tree[i * 2]) <= 0);
            }
            if (i * 2 + 1 < heap.size) {
                assertTrue("Parent is less than or equal to its right child", c.compare(parent, tree[i * 2 + 1]) <= 0);
            }
        }
    }


    //-----------------------------------------------------------------------

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