What are optional parameters in Java

Question

How can we use optional parameters in Java? What are the specifications that should be kept in mind regarding optional parameters?

Answer 1

Using three dots:

public void move(Object... x) {
    String first    =  x.length > 0 ? (String)x[0]  : "Hello";
    int duration    =  x.length > 1 ? Integer.parseInt((String) x[1])     : 888;
}   
move("Hello", ); 
move("Hello", 23);