JAVA HashMap get keys by values
Map<String, String> map = new HashMap<String, String>();
map.put("abc", "123");
map.put("xyz", "456");
for(Entry<String, String> entry : map.entrySet()) {
if(entry.getValue().equalsIgnoreCase("456")) {
System.out.println(entry.getKey());
}
}java map get key from value
import java.util.HashMap;
import java.util.Map;
class Main
{
public static <K, V> K getKey(Map<K, V> map, V value)
{
return map.entrySet().stream()
.filter(entry -> value.equals(entry.getValue()))
.findFirst().map(Map.Entry::getKey)
.orElse(null);
}
public static void main(String[] args)
{
Map<String, Integer> hashMap = new HashMap();
hashMap.put("A", 1);
hashMap.put("B", 2);
hashMap.put("C", 3);
System.out.println(getKey(hashMap, 2)); // prints `B`
}
}Copyright © 2021 Codeinu
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