File: DuplicateMapKeys.md

package info (click to toggle)
error-prone-java 2.4.0-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 15,076 kB
  • sloc: java: 171,398; xml: 1,459; sh: 34; makefile: 7
file content (14 lines) | stat: -rw-r--r-- 459 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
 
JDK 9 has
[`Map#ofEntries`](https://docs.oracle.com/javase/9/docs/api/java/util/Map.html#ofEntries-java.util.Map.Entry...-)
factory which throws runtime error when provided multiple entries with the same
key.

For eg, the following code is erroneously adding two entries with `Foo` as key.

```
Map<String, String> map = Map.ofEntries(
    Map.entry("Foo", "Bar"),
    Map.entry("Ping", "Pong"),
    Map.entry("Kit", "Kat"),
    Map.entry("Foo", "Bar"));
```