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When you write String::toUpperCase, Java binds each element of the stream (String object) to the toUpperCase() method. This means String::toUpperCase is interpreted as s -> s.toUpperCase(), where ...
Running Tests If you look within the src/test/java folder, you will find the Java class OtherStringMethodsTest.java. The src/test/java folder will contain your test files. To run the tests, click on ...
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