16f6c0aecf
Inline adoc files when they are included exactly once. Also fix language tags because this inlining gives us better information on what language the code is written in.
85 lines
1.5 KiB
Plaintext
85 lines
1.5 KiB
Plaintext
== Why is this an issue?
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In Java 14 there is a new way to write cases in Switch Statement and Expression when the same action should be performed for different cases. Instead of declaring multiples branches with the same action, you can combine all of them in a single case group, separated with commas. It will result in a more concise code and improved readability.
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This rule reports an issue when multiple cases in a Switch can be grouped into a single comma-separated case.
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=== Noncompliant code example
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[source,java]
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----
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// Switch Expression
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int i = switch (mode) {
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case "a":
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case "b":
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yield 1;
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default:
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yield 3;
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};
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// Switch Statement
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switch (mode) {
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case "a":
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case "b":
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doSomething();
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break;
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default:
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doSomethingElse();
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}
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----
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=== Compliant solution
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[source,java]
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----
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// Switch Expression
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int i = switch (mode) {
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case "a", "b":
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yield 1;
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default:
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yield 3;
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};
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// Switch Statement
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switch (mode) {
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case "a", "b":
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doSomething();
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break;
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default:
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doSomethingElse();
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}
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// Or even better:
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switch (mode) {
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case "a", "b" -> doSomething();
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default -> doSomethingElse();
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}
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----
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== Resources
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* https://openjdk.java.net/jeps/361[JEP 361: Switch Expressions]
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ifdef::env-github,rspecator-view[]
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'''
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== Implementation Specification
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(visible only on this page)
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=== Message
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Merge the previous cases into this one using comma-separated label.
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=== Highlighting
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* Primary: Last "case" keyword
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* Secondaries: all previous cases
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endif::env-github,rspecator-view[]
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