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BAEL-2800_Copying_a_HashMap_in_Java - types corrected

This commit is contained in:
Anshul Bansal 2019-04-09 07:22:59 +03:00
parent aae74f3b6c
commit 58f416fbb8
1 changed files with 17 additions and 17 deletions
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34
core-java-collections-2/src/main/java/com/baeldung/copyinghashmap/CopyHashMap.java
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@ -10,45 +10,45 @@ import org.apache.commons.lang3.SerializationUtils;
public class CopyHashMap { public class CopyHashMap {
public static <K, V> HashMap<K, V> copyUsingConstructor(HashMap<K, V> originalMap) { public static <String, Employee> HashMap<String, Employee> copyUsingConstructor(HashMap<String, Employee> originalMap) {
return new HashMap<K, V>(originalMap); return new HashMap<String, Employee>(originalMap);
} }
public static <K, V> HashMap<K, V> copyUsingClone(HashMap<K, V> originalMap) { public static <String, Employee> HashMap<String, Employee> copyUsingClone(HashMap<String, Employee> originalMap) {
return (HashMap<K, V>) originalMap.clone(); return (HashMap<String, Employee>) originalMap.clone();
} }
public static <K, V> HashMap<K, V> copyUsingPut(HashMap<K, V> originalMap) { public static <String, Employee> HashMap<String, Employee> copyUsingPut(HashMap<String, Employee> originalMap) {
HashMap<K, V> copyMap = new HashMap<K, V>(); HashMap<String, Employee> copyMap = new HashMap<String, Employee>();
Set<Entry<K, V>> entries = originalMap.entrySet(); Set<Entry<String, Employee>> entries = originalMap.entrySet();
for(Map.Entry<K, V> mapEntry: entries) { for(Map.Entry<String, Employee> mapEntry: entries) {
copyMap.put((K)mapEntry.getKey(), (V)mapEntry.getValue()); copyMap.put(mapEntry.getKey(), mapEntry.getValue());
} }
return copyMap; return copyMap;
} }
public static <K, V> HashMap<K, V> copyUsingPutAll(HashMap<K, V> originalMap) { public static <String, Employee> HashMap<String, Employee> copyUsingPutAll(HashMap<String, Employee> originalMap) {
HashMap<K, V> copyMap = new HashMap<K, V>(); HashMap<String, Employee> copyMap = new HashMap<String, Employee>();
copyMap.putAll(originalMap); copyMap.putAll(originalMap);
return copyMap; return copyMap;
} }
public static <K, V> HashMap<K, V> copyUsingJava8Stream(HashMap<K, V> originalMap) { public static <String, Employee> HashMap<String, Employee> copyUsingJava8Stream(HashMap<String, Employee> originalMap) {
Set<Entry<K, V>> entries = originalMap.entrySet(); Set<Entry<String, Employee>> entries = originalMap.entrySet();
HashMap<K, V> copyMap = (HashMap<K, V>) entries HashMap<String, Employee> copyMap = (HashMap<String, Employee>) entries
.stream() .stream()
.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)); .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
return copyMap; return copyMap;
} }
public static <K, V> HashMap<K, V> shallowCopy(HashMap<K, V> originalMap) { public static <String, Employee> HashMap<String, Employee> shallowCopy(HashMap<String, Employee> originalMap) {
return (HashMap<K, V>) originalMap.clone(); return (HashMap<String, Employee>) originalMap.clone();
} }
public static <K, V> HashMap<K, V> deepCopy(HashMap<K, V> originalMap) { public static <String, Employee> HashMap<String, Employee> deepCopy(HashMap<String, Employee> originalMap) {
return SerializationUtils.clone(originalMap); return SerializationUtils.clone(originalMap);
} }