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並前往https://newbedev.com/java-adding-another-string-value-to-existing-hashmap-key-without-overwriting

Java - Adding another String value to existing HashMap Key ...

What are you hoping to achieve here? A Map (the HashMap) in your case is a direct "mapping" from one "key" to another value. E.g. "foo" -> 123 "bar" -> 321 ...

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