Holder class usage

Javax. xml. ws. Holder

 

In Java, "call by value" is called by copying the original value (instead of the original value)

If the parameter is an object reference, and the parameter reference changes the object's domain or calls a method to change the object's state, the object changes for other code that holds the object reference.

That is to say, the in parameter is a Java parameter, and the out and inout parameters are not inherent in Java.

While the JAX-WS2.0 supports the out, inout parameters.

Holder provides a variable packaging for immutable object references and supports reference transfer in Java. In this way, Java can communicate with Web services that support inout and out parameters.