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());
}
}get key from value hashmap
import java.util.HashMap;
import java.util.Map.Entry;
class Main {
public static void main(String[] args) {
// create a hashmap
HashMap<String, Integer> numbers = new HashMap<>();
numbers.put("One", 1);
numbers.put("Two", 2);
numbers.put("Three", 3);
System.out.println("HashMap: " + numbers);
// value whose key is to be searched
Integer value = 3;
// iterate each entry of hashmap
for(Entry<String, Integer> entry: numbers.entrySet()) {
// if give value is equal to value from entry
// print the corresponding key
if(entry.getValue() == value) {
System.out.println("The key for value " + value + " is " + entry.getKey());
break;
}
}
}
}Copyright © 2021 Codeinu
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