Method That Accept Object As A Parameter

I have a method that accepts as a parameter an object:

public void addClient(Client c){ }

Client is a class which has a constructor that has two String parameters:

public Cliente (String name, String lastname){
this.name = name;
this.lastname = lastname;
}

In the main add a Client in this way:

addClient(new Cliente("first", "second"));

Now, i have an array of Client, so I would like to enter within this. Example:

public void addClient(Client c){
for (int i = 0; i<client.length ; i++) { // client is an array of Client object
client[i] = c; // Enter a c in the array, but does not work!
System.out.println("test "+clienti[i]); // print Client@15db9743
}
}

I have used the println for check if worked insertion, but the result shows no