Get keys from value in HashMap To find all the keys that map to a certain value, we can loop the entrySet() and Objects. equals to compare the value and get the key .
Read moreWhat is containsKey in Java?
HashMap containsKey() Method in Java The java. util. HashMap. containsKey() method is used to check whether a particular key is being mapped into the HashMap or not . It takes the key element as a parameter and returns True if that element is mapped in the map.
Read moreHow do you make a HashMap key immutable?
Make HashMap key object immutable Also, this class must honor the hashCode() and equals() methods contract . This is the main reason why immutable classes like String , Integer or other wrapper classes are a good key object candidate.
Read moreIs map containsKey case sensitive?
Show activity on this post. Closed 6 years ago. I want to know whether a particular key is present in a HashMap, so i am using containsKey(key) method. But it is case sensitive ie it does not returns true if there is a key with Name and i am searching for name.
Read moreIs HashMap keys case sensitive?
You know keys in the java. util. HashMap are case sensitive . It means you can keep both “abc” and “ABC” as keys in the same map.
Read more