How to invoke another Java file in Java program?

Hello all,
Now I am building a commnity of agents that can talk in Java, I have another Java-Based dialogue system to handle the dialogue between the agents. But I don'y know how to invoke the Java dialogue system file in the agent class.
Is there any methods can call another .java file in a Java program?
Help!!!!!please

Yep, vaguest of the vaguey vague vague.
Anyhoo,
I'm guessing you want to call a method from a different class?
Assuming you have the "Runner" class and then "Agent1", "Agent2", etc.
Agent1 whatever = new Agent1();

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