In Java, a method can receive a variable number of arguments if its signature contains an argument of the varargs type.

For example, the plantation() method takes a variable number of arguments, for example, Seed... seeds:

public class Melon {
  ...
  public void plantation(String type, Seed...seeds) {}
  ...
}

Now, the Java Reflection API can tell whether this method supports a variable number of arguments via the Method.isVarArgs() method, as follows:

Class<Melon> clazz = Melon.class;
Method[] methods = clazz.getDeclaredMethods();

for (Method method: methods) {
  System.out.println("Method name: " + method.getName() 
    + " varargs? " + method.isVarArgs());
}

You will receive output similar to the following:

Method name: plantation, varargs? true
Method name: getWeight, varargs? false
Method name: toString, varargs? false
Method name: getType, varargs? false