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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(); streamOf();
streamEx(); 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() { private static void streamEx() {
@ -55,9 +73,9 @@ public class MergeMaps {
private static void streamConcat() { private static void streamConcat() {
Map<String, Employee> result = Stream.concat(map1.entrySet().stream(), map2.entrySet().stream()).collect(Collectors.toMap( Map<String, Employee> result = Stream.concat(map1.entrySet().stream(), map2.entrySet().stream()).collect(Collectors.toMap(
Map.Entry::getKey, Map.Entry::getKey,
Map.Entry::getValue, Map.Entry::getValue,
(value1, value2) -> new Employee(value1.getId(), value2.getName()) (value1, value2) -> new Employee(value1.getId(), value2.getName())
)); ));
result.entrySet().forEach(System.out::println); result.entrySet().forEach(System.out::println);
@ -68,14 +86,13 @@ public class MergeMaps {
map2.forEach( map2.forEach(
(key, value) -> map3.merge(key, value, (v1, v2) -> (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); map3.entrySet().forEach(System.out::println);
} }
private static void initialize() { private static void initialize() {
Employee employee1 = new Employee(1L, "Henry"); Employee employee1 = new Employee(1L, "Henry");
map1.put(employee1.getName(), employee1); map1.put(employee1.getName(), employee1);