public static void main(String[] args) {
var myPets = new ArrayList();
myPets.add("cat");//cat类
myPets.add("dog");//dog类
myPets.add("horse");//horse类
for(var pet:myPets) {
System.out.print(pet+"");
System.out.println();
var bigPets = new String[] {"tiger","lion"};
List list = new ArrayList<>();
list.add(bigPets[0]);
list.add(bigPets[1]);
myPets.addAll(list);
System.out.println(myPets.contains("elephant"));
var iterator = myPets.iterator();
while(iterator.hasNext()) {
String pet1 = iterator.next();
System.out.print(pet1+"");
}
}