/*
* Copyright ( c ) 2018 , 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 8050818
* @ run testng PredicateNotTest
*/
import java.util.List;
import java.util.function .Predicate;
import org.testng.annotations.Test;
import static java.util.function .Predicate.not;
import static java.util.stream.Collectors.joining;
import static org.testng.Assert .assertEquals;
import static org.testng.Assert .fail;
@Test(groups = "unit" )
public class PredicateNotTest {
static class IsEmptyPredicate implements Predicate<String> {
@Override
public boolean test(String s) {
return s.isEmpty();
}
}
public void test() {
List<String> test = List.of(
"A non-empty line" ,
"" ,
"A non-empty line" ,
"" ,
"A non-empty line" ,
"" ,
"A non-empty line" ,
""
);
String expected = "A non-empty line\nA non-empty line\nA non-empty line\nA non-empty line" ;
assertEquals(test.stream().filter(not(String::isEmpty)).collect(joining("\n" )), expected);
assertEquals(test.stream().filter(not(s -> s.isEmpty())).collect(joining("\n" )), expected);
assertEquals(test.stream().filter(not(new IsEmptyPredicate())).collect(joining("\n" )), expected);
assertEquals(test.stream().filter(not(not(not(String::isEmpty)))).collect(joining("\n" )), expected);
assertEquals(test.stream().filter(not(not(not(s -> s.isEmpty())))).collect(joining("\n" )), expected);
assertEquals(test.stream().filter(not(not(not(new IsEmptyPredicate())))).collect(joining("\n" )), expected);
}
}
Messung V0.5 in Prozent C=96 H=90 G=93
¤ Dauer der Verarbeitung: 0.0 Sekunden
(vorverarbeitet am 2026-10-11)
¤
*© Formatika GbR, Deutschland