flatMap Developer Language Skillshttps://www.golabs.ch/l?&atomFri, 29 Mar 2024 06:13:47 +0000stack.ch
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812bf1e2-ed93-11ee-8c11-005056bb85fbSimtech AG - Ausbildung - Java - Kurs Java Advanced - Kurs Java Advanced - Ressourcen - Kurs Java Advanced - Übungen Lambda & Stream API - flatMap Developer Language Skills
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812bf34f-ed93-11ee-8c11-005056bb85fbFri, 29 Mar 2024 06:13:47 +0000flatMap Developer Language Skills
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812bf46f-ed93-11ee-8c11-005056bb85fbFri, 29 Mar 2024 06:13:47 +0000
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812bf55d-ed93-11ee-8c11-005056bb85fbFri, 29 Mar 2024 06:13:47 +0000Eine Software Team besteht aus mehreren Entwicklern mit unterschiedlichen Kenntnissen von einer oder mehrerer Programmiersprachen. Jeder Entwickler wird über die Klasse ch.std.jpf2.lambda.flatmap.Developer abgebildet:package ch.std.jpf2.lambda.flatmap;
import java.util.HashSet;
import java.util.Set;
public class Developer {
private String name;
private Set languages;
public Developer(String name) {
this.languages = new HashSet<>();
this.name = name;
}
public void add(String language) {
this.languages.add(language);
}
public Set getLanguages() {
return languages;
}
public String getName() {
return name;
}
}
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812bf8bb-ed93-11ee-8c11-005056bb85fbFri, 29 Mar 2024 06:13:47 +0000Der folgende Unit Test zeigt die flatMap Anwendung:package ch.std.jpf2.lambda.flatmap.test;
import static org.junit.Assert.assertTrue;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import org.junit.Test;
import ch.std.jpf2.lambda.flatmap.Developer;
public class FlatMapTest {
@Test
public void flatMap() {
List<Developer> team = new ArrayList<>();
Developer polyglot = new Developer("esoteric");
polyglot.add("clojure");
polyglot.add("scala");
polyglot.add("groovy");
polyglot.add("go");
Developer busy = new Developer("pragmatic");
busy.add("java");
busy.add("javascript");
team.add(polyglot);
team.add(busy);
List<String> teamLanguages = team.stream().
map(d -> d.getLanguages()).
flatMap(l -> l.stream()).
collect(Collectors.toList());
assertTrue(teamLanguages.containsAll(polyglot.getLanguages()));
assertTrue(teamLanguages.containsAll(busy.getLanguages()));
}
}Mit FlatMap wird die Liste der Developer und deren Language Skills auf eine einzelne Liste reduziert.
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