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merge maps more examples

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This commit is contained in:
mherbaghinyan 2018-09-28 17:32:11 +04:00
parent 03f28236b8
commit ee7fa854b4
1 changed files with 38 additions and 2 deletions
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40
core-java-collections/src/main/java/com/baeldung/map/java_8/MergeMaps.java
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@ -4,6 +4,8 @@ import com.baeldung.sort.Employee;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class MergeMaps {
@ -14,16 +16,50 @@ public class MergeMaps {
initialize();
//mergeFunction();
//streamConcat();
streamOf();
}
private static void streamOf() {
Map<String, Employee> map3 = Stream.of(map1, map2)
.flatMap(map -> map.entrySet().stream())
.collect(
Collectors.toMap(
Map.Entry::getKey,
Map.Entry::getValue,
(v1, v2) -> new Employee(v1.getId(), v2.getName())
)
);
map3.entrySet().forEach(System.out::println);
}
private static void streamConcat() {
Map<String, Employee> result = Stream.concat(map1.entrySet().stream(), map2.entrySet().stream()).collect(Collectors.toMap(
Map.Entry::getKey,
Map.Entry::getValue,
(value1, value2) -> new Employee(value1.getId(), value2.getName())
));
result.entrySet().forEach(System.out::println);
}
private static void mergeFunction() {
Map<String, Employee> map3 = new HashMap<>(map1);
map2.forEach(
(key, value) -> map3.merge(key, value, (v1, v2) ->
new Employee(v1.getId(),v2.getName()))
(key, value) -> map3.merge(key, value, (v1, v2) ->
new Employee(v1.getId(),v2.getName()))
);
map3.entrySet().forEach(System.out::println);
}
private static void initialize() {
Employee employee1 = new Employee(1L, "Henry");
map1.put(employee1.getName(), employee1);