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/*
* Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @bug 4143272 6548425
* @summary The natural ordering on Float and Double was not even a partial
* order (i.e., it violated the contract of Comparable.compareTo).
* Now it's a total ordering. Arrays.sort(double[])
* and Arrays.sort(double[]) reflect the new ordering. Also,
* Arrays.equals(double[], double[]) and
* Arrays.equals(float[], float[]) reflect the definition of
* equality used by Float and Double.
*/
import java.util.*;
@SuppressWarnings("unchecked")
public class FloatDoubleOrder {
void test(String[] args) throws Throwable {
double[] unsortedDbl = new double[] {1.0d, 3.7d, Double.NaN, -2.0d,
Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY, 0.0d, -0.0d};
double[] sortedDbl = new double[] {Double.NEGATIVE_INFINITY, -2.0d,
-0.0d, 0.0d, 1.0d, 3.7d, Double.POSITIVE_INFINITY, Double.NaN};
List list = new ArrayList();
for (int i=0; i<unsortedDbl.length; i++)
list.add(new Double(unsortedDbl[i]));
Collections.sort(list);
List sortedList = new ArrayList();
for (int i=0; i<sortedDbl.length; i++)
sortedList.add(new Double(sortedDbl[i]));
check(list.equals(sortedList));
Arrays.sort(unsortedDbl);
check(Arrays.equals(unsortedDbl, sortedDbl));
double negNan = Double.longBitsToDouble(0xfff8000000000000L);
for (int i = 0; i < sortedDbl.length; i++) {
equal(Arrays.binarySearch(sortedDbl, sortedDbl[i]), i);
if (Double.isNaN(sortedDbl[i]))
equal(Arrays.binarySearch(sortedDbl, negNan), i);
}
float[] unsortedFlt = new float[] {1.0f, 3.7f, Float.NaN, -2.0f,
Float.POSITIVE_INFINITY, Float.NEGATIVE_INFINITY, 0.0f, -0.0f};
float[] sortedFlt = new float[] {Float.NEGATIVE_INFINITY, -2.0f,
-0.0f, 0.0f, 1.0f, 3.7f, Float.POSITIVE_INFINITY, Float.NaN};
list.clear();
for (int i=0; i<unsortedFlt.length; i++)
list.add(new Float(unsortedFlt[i]));
Collections.sort(list);
sortedList.clear();
for (int i=0; i<sortedFlt.length; i++)
sortedList.add(new Float(sortedFlt[i]));
check(list.equals(sortedList));
Arrays.sort(unsortedFlt);
check(Arrays.equals(unsortedFlt, sortedFlt));
float negNaN = Float.intBitsToFloat(0xFfc00000);
for (int i = 0; i < sortedDbl.length; i++) {
equal(Arrays.binarySearch(sortedFlt, sortedFlt[i]), i);
if (Float.isNaN(sortedFlt[i]))
equal(Arrays.binarySearch(sortedFlt, negNaN), i);
}
// 6548425: Arrays.sort incorrectly sorts a double array
// containing negative zeros
double[] da = {-0.0d, -0.0d, 0.0d, -0.0d};
Arrays.sort(da, 1, 4);
check(Arrays.equals(da, new double[] {-0.0d, -0.0d, -0.0d, 0.0d}));
float[] fa = {-0.0f, -0.0f, 0.0f, -0.0f};
Arrays.sort(fa, 1, 4);
check(Arrays.equals(fa, new float[] {-0.0f, -0.0f, -0.0f, 0.0f}));
}
//--------------------- Infrastructure ---------------------------
volatile int passed = 0, failed = 0;
void pass() {passed++;}
void fail() {failed++; Thread.dumpStack();}
void fail(String msg) {System.err.println(msg); fail();}
void unexpected(Throwable t) {failed++; t.printStackTrace();}
void check(boolean cond) {if (cond) pass(); else fail();}
void equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) pass();
else fail(x + " not equal to " + y);}
public static void main(String[] args) throws Throwable {
new FloatDoubleOrder().instanceMain(args);}
void instanceMain(String[] args) throws Throwable {
try {test(args);} catch (Throwable t) {unexpected(t);}
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
if (failed > 0) throw new AssertionError("Some tests failed");}
}
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