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add one map to another

This commit is contained in:
mherbaghinyan 2018-10-02 11:42:11 +04:00
parent 7773f968da
commit 1f1baf97e9
1 changed files with 22 additions and 5 deletions
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27
core-java-collections/src/main/java/com/baeldung/map/java_8/MergeMaps.java
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@ -28,6 +28,24 @@ public class MergeMaps {
streamOf();
streamEx();
streamMerge();
}
private static void streamMerge() {
Map<String, Employee> map3 = map2.entrySet()
.stream()
.collect(
Collectors.toMap(
Map.Entry::getKey,
Map.Entry::getValue,
(v1, v2) -> new Employee(v1.getId(), v2.getName()),
() -> new HashMap<>(map1)
)
);
System.out.println(map3);
}
private static void streamEx() {
@ -55,9 +73,9 @@ public class MergeMaps {
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())
Map.Entry::getKey,
Map.Entry::getValue,
(value1, value2) -> new Employee(value1.getId(), value2.getName())
));
result.entrySet().forEach(System.out::println);
@ -68,14 +86,13 @@ public class MergeMaps {
map2.forEach(
(key, value) -> map3.merge(key, value, (v1, v2) ->
new Employee(v1.getId(),v2.getName()))
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);