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HashMap<String, Double> missions = new HashMap<>();
missions.put("name", 1.0);
missions.put("name1", 2.0);
missions.keySet().stream().forEach(el-> System.out.println(el));
This prints only the keys, how do I print the map's values instead?
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Print HashMap Elements in Java This is the simplest way to print HashMap in Java. Just pass the reference of HashMap into the println() method, and it will print key-value pairs into the curly braces.
Printing All Keys and Values From the HashMap keys. forEach(key -> System. out. println(key));
In this article, we will discuss how to sort HashMap by its Keys and Values using stream in Java 8 Prior to Java 8 release, we can sort HashMap either by its Keys or Values as explained in the below articles, With the release of Java 8, we can use sorted () method of Stream class by passing Comparator objects 1. Sorting HashMap by its Keys
The keySet method of the HashMap class returns a Set view containing all the keys of the HashMap. You can also use the System.out.println statement instead of using the for loop if you do not want to change the output format. //will print all keys in format [key1, key2...]
A HashMap is a subclass of AbstractMap class and it is used to store key & value pairs. Each key is mapped to a single value in the map and the keys are unique. It means we can insert a key only once in a map and duplicate keys are not allowed, but the value can be mapped to multiple keys.
There are 3 ways to print the elements of a Stream in Java: Below are the three ways to print the Stream in detail: Stream forEach (Consumer action): This method performs an action for each element of the stream. Stream forEach (Consumer action) is a terminal operation i.e, it may traverse the stream to produce a result or a side-effect.
Use entrySet() (or values() if that's what you need) instead of keySet():
Map<String, Double> missions = new HashMap<>();
missions.put("name", 1.0);
missions.put("name1", 2.0);
missions.entrySet().stream().forEach(e-> System.out.println(e));
HashMap<String, Double> missions = new HashMap<>();
missions.put("name", 1.0);
missions.put("name1", 2.0);
missions.entrySet().forEach(System.out::println);
Output:
name=1.0
name1=2.0
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