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* Copyright (c) 2009, 2015, 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
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*/
/*
* @test
* @bug 6797535 6889858 6891113 8013712 8011800 8014365
* @summary Basic tests for methods in java.util.Objects
* @author Joseph D. Darcy
*/
import java.util.*;
import java.util.function.*;
public class BasicObjectsTest {
public static void main(String... args) {
int errors = 0;
errors += testEquals();
errors += testDeepEquals();
errors += testHashCode();
errors += testHash();
errors += testToString();
errors += testToString2();
errors += testCompare();
errors += testRequireNonNull();
errors += testIsNull();
errors += testNonNull();
errors += testNonNullOf();
if (errors > 0 )
throw new RuntimeException();
}
private static int testEquals() {
int errors = 0;
Object[] values = {null, "42", 42};
for(int i = 0; i < values.length; i++)
for(int j = 0; j < values.length; j++) {
boolean expected = (i == j);
Object a = values[i];
Object b = values[j];
boolean result = Objects.equals(a, b);
if (result != expected) {
errors++;
System.err.printf("When equating %s to %s, got %b instead of %b%n.",
a, b, result, expected);
}
}
return errors;
}
private static int testDeepEquals() {
int errors = 0;
Object[] values = {null,
null, // Change to values later
new byte[] {(byte)1},
new short[] {(short)1},
new int[] {1},
new long[] {1L},
new char[] {(char)1},
new float[] {1.0f},
new double[]{1.0d},
new String[]{"one"}};
values[1] = values;
for(int i = 0; i < values.length; i++)
for(int j = 0; j < values.length; j++) {
boolean expected = (i == j);
Object a = values[i];
Object b = values[j];
boolean result = Objects.deepEquals(a, b);
if (result != expected) {
errors++;
System.err.printf("When equating %s to %s, got %b instead of %b%n.",
a, b, result, expected);
}
}
return errors;
}
private static int testHashCode() {
int errors = 0;
errors += (Objects.hashCode(null) == 0 ) ? 0 : 1;
String s = "42";
errors += (Objects.hashCode(s) == s.hashCode() ) ? 0 : 1;
return errors;
}
private static int testHash() {
int errors = 0;
Object[] data = new String[]{"perfect", "ham", "THC"};
errors += ((Objects.hash((Object[])null) == 0) ? 0 : 1);
errors += (Objects.hash("perfect", "ham", "THC") ==
Arrays.hashCode(data)) ? 0 : 1;
return errors;
}
private static int testToString() {
int errors = 0;
errors += ("null".equals(Objects.toString(null)) ) ? 0 : 1;
String s = "Some string";
errors += (s.equals(Objects.toString(s)) ) ? 0 : 1;
return errors;
}
private static int testToString2() {
int errors = 0;
String s = "not the default";
errors += (s.equals(Objects.toString(null, s)) ) ? 0 : 1;
errors += (s.equals(Objects.toString(s, "another string")) ) ? 0 : 1;
return errors;
}
private static int testCompare() {
int errors = 0;
String[] values = {"e. e. cummings", "zzz"};
String[] VALUES = {"E. E. Cummings", "ZZZ"};
errors += compareTest(null, null, 0);
for(int i = 0; i < values.length; i++) {
String a = values[i];
errors += compareTest(a, a, 0);
for(int j = 0; j < VALUES.length; j++) {
int expected = Integer.compare(i, j);
String b = VALUES[j];
errors += compareTest(a, b, expected);
}
}
return errors;
}
private static int compareTest(String a, String b, int expected) {
int errors = 0;
int result = Objects.compare(a, b, String.CASE_INSENSITIVE_ORDER);
if (Integer.signum(result) != Integer.signum(expected)) {
errors++;
System.err.printf("When comparing %s to %s, got %d instead of %d%n.",
a, b, result, expected);
}
return errors;
}
private static int testRequireNonNull() {
int errors = 0;
final String RNN_1 = "1-arg requireNonNull";
final String RNN_2 = "2-arg requireNonNull";
final String RNN_3 = "Supplier requireNonNull";
Function<String, String> rnn1 = s -> Objects.requireNonNull(s);
Function<String, String> rnn2 = s -> Objects.requireNonNull(s, "trousers");
Function<String, String> rnn3 = s -> Objects.requireNonNull(s, () -> "trousers");
errors += testRNN_NonNull(rnn1, RNN_1);
errors += testRNN_NonNull(rnn2, RNN_2);
errors += testRNN_NonNull(rnn3, RNN_3);
errors += testRNN_Null(rnn1, RNN_1, null);
errors += testRNN_Null(rnn2, RNN_2, "trousers");
errors += testRNN_Null(rnn3, RNN_3, "trousers");
return errors;
}
private static int testRNN_NonNull(Function<String, String> testFunc,
String testFuncName) {
int errors = 0;
try {
String s = testFunc.apply("pants");
if (s != "pants") {
System.err.printf(testFuncName + " failed to return its arg");
errors++;
}
} catch (NullPointerException e) {
System.err.printf(testFuncName + " threw unexpected NPE");
errors++;
}
return errors;
}
private static int testRNN_Null(Function<String, String> testFunc,
String testFuncName,
String expectedMessage) {
int errors = 0;
try {
String s = testFunc.apply(null);
System.err.printf(testFuncName + " failed to throw NPE");
errors++;
} catch (NullPointerException e) {
if (e.getMessage() != expectedMessage) {
System.err.printf(testFuncName + " threw NPE w/ bad detail msg");
errors++;
}
}
return errors;
}
private static int testIsNull() {
int errors = 0;
errors += Objects.isNull(null) ? 0 : 1;
errors += Objects.isNull(Objects.class) ? 1 : 0;
return errors;
}
private static int testNonNull() {
int errors = 0;
errors += Objects.nonNull(null) ? 1 : 0;
errors += Objects.nonNull(Objects.class) ? 0 : 1;
return errors;
}
private static int testNonNullOf() {
int errors = 0;
String defString = new String("default");
String nullString = null;
String nonNullString = "non-null";
// Confirm the compile time return type matches
String result = Objects.requireNonNullElse(nullString, defString);
errors += (result == defString) ? 0 : 1;
errors += (Objects.requireNonNullElse(nonNullString, defString) == nonNullString) ? 0 : 1;
errors += (Objects.requireNonNullElse(nonNullString, null) == nonNullString) ? 0 : 1;
try {
Objects.requireNonNullElse(null, null);
errors += 1;
} catch (NullPointerException npe) {
// expected
errors += npe.getMessage().equals("defaultObj") ? 0 : 1;
}
// Test requireNonNullElseGet with a supplier
errors += (Objects.requireNonNullElseGet(nullString, () -> defString) == defString) ? 0 : 1;
errors += (Objects.requireNonNullElseGet(nonNullString, () -> defString) == nonNullString) ? 0 : 1;
errors += (Objects.requireNonNullElseGet(nonNullString, () -> null) == nonNullString) ? 0 : 1;
try {
Objects.requireNonNullElseGet(null, () -> null);
errors += 1;
} catch (NullPointerException npe) {
// expected
errors += npe.getMessage().equals("supplier.get()") ? 0 : 1;
}
try { // supplier is null
Objects.requireNonNullElseGet(null, null);
errors += 1;
} catch (NullPointerException npe) {
// expected
errors += npe.getMessage().equals("supplier") ? 0 : 1;
}
return errors;
}
}