AbstractCollection already overrides toString() to print the contents of its elements. So, just list.toString() prints the toString() of all its elements. This is true for all collections.
public StringBuilder append(Object obj)
Appends the string representation of the Object argument.
List vegetables = new ArrayList<> () ;
vegetables.add ("Kale");
vegetables.add (0, "Lettuce");
System.out.println (vegetables);
List fish = new ArrayList<> ();
fish.add ("Salmon");
fish.add(0, "Seabass");
System.out.println(fish);
Tested: C.
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