What is the method called by the union community?

In Java, you can declare a union using the union keyword and call the corresponding methods through the union instance. The methods that can be called by the union instance include:

  1. Retrieve the data stored in the community using getXXX(), where XXX represents the corresponding data type, such as getInt(), getFloat(), and so on.
  2. setXXX(): set the data stored in the union, where XXX represents the corresponding data type, such as setInt(int), setFloat(float), etc.
  3. Get the size of a structure, which is the total number of bytes occupied by all its member variables.

It is important to note that in Java, communities are not natively supported data types and should be implemented through JNI (Java Native Interface). When using them, you will need to first declare a Java class, declare it as native, and then implement the specific functions of the community through JNI.

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