import java.util.ArrayList;
 
public class TestArrayList {
	public static void main(String[] args) {
		//create a list to store cities
		ArrayList cityList = new ArrayList();
		
		//add some cities to the list
		cityList.add("London");
		//citylist now contains [London]
		cityList.add("Denver");
		cityList.add("Paris");
		cityList.add("Timbuktu");
		cityList.add("Burlington");
		cityList.add("Dublin");
		cityList.add("Miami");
		cityList.add("Tokyo");
		//cityList now contains[London,Denver,Paris,Timbuktu,Burlington, Dublin,Miami,Tokyo]
		
		System.out.println("list size " + cityList.size());
		System.out.println("is miami in the list? " + cityList.contains("Miami"));
		System.out.println("location of denver in the list " + cityList.indexOf("Denver"));
		System.out.println("Is the list empty " + cityList.isEmpty());
		
		//insert new city at index 2
		cityList.add(2, "Xian");
		//remove a city from the list
		cityList.remove("Miami");
		//remove city at index 1
		cityList.remove(1);
		//display contents in the list
		System.out.println(cityList.toString());
		
		//display contents in reverse order
		for (int i = 0; i < cityList.size(); i++) {
			System.out.println(cityList.get(i) + " ");
		}
		
		//create a list to store two circle
		ArrayList list = new ArrayList();
		
		//add two circles
		list.add(new Circle4(2));
		list.add(new Circle4(3));
		
		//display area of first circle in list
		System.out.println("\nthe area of the circle? " + ((Circle4)list.get(0)).getArea());
	}
}
 

TestArrayList.java:43: cannot find symbol
symbol  : class Circle4

import java.util.ArrayList;
 
public class TestArrayList {
	public static void main(String[] args) {
		//create a list to store cities
		ArrayList cityList = new ArrayList();
		
		//add some cities to the list
		cityList.add("London");
	}
}

$ javac TestArrayList.java -Xlint:unchecked
TestArrayList.java:9: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.ArrayList
                cityList.add("London");
                            ^
1 warning

import java.util.ArrayList;
 
public class TestArrayList {
	public static void main(String[] args) {
		//create a list to store cities
		ArrayList<String> cityList = new ArrayList<String>();
		
		//add some cities to the list
		cityList.add("London");
	}
}