![]() ImmutableMap.values().forEach(System. This is assuming 'first key' means the first one you inserted. Im working with a large ArrayList, and I would repeatedly need to select a random key from a random HashMap (and do some stuff with it).For that purpose, HashMap will suffice, you might replace TreeMap with a HashMap if you are not utilizing it for anything else. Collection values() method gets all values contained in the map If you want to iterate over the Map and expect to iterate over it in the order you inserted entries, you should use a LinkedHashMap instead of a HashMap. I used TreeMap instead of HashMap so that I can sort the map if needed (maybe not need).ImmutableMap.keySet().forEach(System.out::println) Set keySet() method gets all keys contained in the map.By calling keySet () method, you can get set object with all key values. ImmutableMap.entrySet().forEach(System.out::println) Below example shows how to get all keys from the given HashMap. For Spring Boot developers, this means we need to use Spring Security for OpenID and OAuth2 connectivity with Keycloak instead of relying on Keycloak adapters. Map immutableMap = Map.of("k1", 1, "k2", 2) Java Spring Boot Security Muhammad Edwin Senior Consultant Table of contents: Quite some time ago, Keycloak deprecated its adapters, including OpenID connect for Java adapters. Set> entrySet() method gets all key-value mappings entries contained in the map This method returns a List of the keys corresponding to a given value. ![]() You can query a HashMap in Java with entrySet(), keySet() and values() methods to get all keys and values mapping get methods to return value by the specified key containsKey and containsValue methods to check existing size and isEmpty methods to check the HashMap size Get all HashMap keys and values ![]()
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