How to open Java's api: first download Oracle and select [...for Developers]; then click [Java APIs] on the right side of the interface; finally click on the version you need, and you can open the corresponding online Java API documentation.
Java api opening method:
1. Open Baidu, search for Oracle, and open the Oracle official website.
#2. Click "Download Java for Developers" at the bottom of the Oracle website interface.
#3. Click "Java APIs" on the right side of the interface.
#4. Then you can see the Java API of each version.
#5. Click on the version you need to open the corresponding Java API document online.
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