从头开始实现`Stack`

Question

I'd like to implement Stack from scratch and encountered a problem. I feel like I'm writing the parameters for push method wrong such as:

public void push(<T> foo){
    myList.add(foo);
}

How else can I write the parameter when I'm not sure what type the foo is going to be?

package Stack;
import java.util.*;

public class Stack<T> {

    private List<T> myList;

    public Stack(){
        myList = null;
    }

    public boolean empty(){
        return (myList == null);
    }

    public void push(<T> foo){
        myList.add(foo);
    }
}

Answer 1

public void push(T foo) {
    myList.add(foo);
}

You can read more on generics here .

Answer 2

The correct syntax is :

public void push(T foo) {
    myList.add(foo);
}

Answer 3

It just needs to be

public void push(T foo){
    myList.add(foo);
}

Answer 4

Type cast foo to Object type

public void push(Object foo){
    myList.add(foo);
}