How to fix Set.of() cannot find symbol: method of(String,String)?

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I'm trying to use Set.of() to create a set of string. Here is my import and code. I don't know why it always reports cannot find symbol:

import java.util.Set;
Set<String> existedFieldsValueList = Set.of("field1", "field2");

Here is the error log

[javac]     Set<String> existedFieldsValueList = Set.of("field1", "field2");
[javac]                                             ^
[javac]   symbol:   method of(String,String)
[javac]   location: interface Set

Did I miss anything?

compiler-errors set java
1 Answers

This method was introduced in JDK 9. From the error message, it looks like you're using an older JDK. Upgrade to a newer one and you should be fine.

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