how are objects passed into methods

Answer 1

public void xyz (int x, int y, int x)

xyz (1,2,3);

Answer 2

Here is a method that accepts a String object and a List of Integer object:
public class Test {
public static void myMethod(String strObj, List<Integer> listObj) {}
}
Here is how you call that method and pass your objects to it:
public static void main(String[] args) {
String strObj ="Hello";
List<Integer> listObj = new ArrayList<Integer>();
listObj.add(1);
listObj.add(2);
Test.myMethod(strObj, listObj);
}