Skip to content

Update java/concepts/maps/introduction.md #2918

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
kadrisamuel wants to merge 1 commit into from
Closed

Update java/concepts/maps/introduction.md #2918

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
12 changes: 7 additions & 5 deletions concepts/maps/introduction.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -37,15 +37,15 @@ fruitPrices.get("apple"); // => 100
Use [containsKey][map-containskey-javadoc] to see if the map contains a particular key.

```java
fruitPrices.containsKey("apple"); // => true
fruitPrices.containsKey("apple"); // => true
fruitPrices.containsKey("orange"); // => false
```

Remove entries with [remove][map-remove-javadoc].

```java
fruitPrices.put("plum", 90); // Add plum to map
fruitPrices.remove("plum"); // Removes plum from map
fruitPrices.put("plum", 90); // Add plum to map
fruitPrices.remove("plum"); // Removes plum from map
```

The [size][map-size-javadoc] method returns the number of entries.
Expand All @@ -54,10 +54,10 @@ The [size][map-size-javadoc] method returns the number of entries.
fruitPrices.size(); // Returns 2
```

You can use the [keys] or [values] methods to obtain the keys or the values in a Map as a Set or collection respectively.studentScores
You can use the [keySet][map-keyset-javadoc] or [values][map-values-javadoc] methods to obtain the keys or the values in a Map as a Set or collection respectively.studentScores

```java
fruitPrices.keys(); // Returns "apple" and "pear" in a set
fruitPrices.keySet(); // Returns "apple" and "pear" in a set
fruitPrices.values(); // Returns 100 and 80, in a Collection
```

Expand All @@ -68,3 +68,5 @@ fruitPrices.values(); // Returns 100 and 80, in a Collection
[map-containskey-javadoc]: https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/Map.html#containsKey(java.lang.Object)
[map-remove-javadoc]: https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/Map.html#remove(java.lang.Object)
[map-size-javadoc]: https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/Map.html#size()
[map-keyset-javadoc]: https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/Map.html#keySet()
[map-values-javadoc]: https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/Map.html#values()