// date:17.6.28

// author: aquanox@163.com

/* compile and run

kolya@asus ~/src/Introduction-to-Java-Programming $ javac chap9/TestArrayList.java

注: chap9/TestArrayList.java使用了未经检查或不安全的操作。

注: 有关详细信息, 请使用 -Xlint:unchecked 重新编译。

kolya@asus ~/src/Introduction-to-Java-Programming $ java chap9/TestArrayList

*/

package chap9;

public class TestArrayList {

public static void main(String[] args) {

java.util.ArrayList cityList = new java.util.ArrayList();

cityList.add("London");

cityList.add("New York");

cityList.add("Paris");

cityList.add("Toronto");

cityList.add("Hong Kong");

cityList.add("Singapore");

System.out.println("List size? " + cityList.size());

System.out.println("is Toronto in the list? " + cityList.contains("Toronto"));

System.out.println("the location of new york in the list is " + cityList.indexOf("New York"));

System.out.println("is the list empty? " + cityList.isEmpty());

cityList.add(2, "Beijing");

cityList.remove("Toronto");

cityList.remove(1);

for (int i = 0; i < cityList.size(); i++) {

System.out.print(cityList.get(i) + " ");

}

System.out.println();

java.util.ArrayList list = new java.util.ArrayList();

list.add(new Circle(2));

list.add(new Circle(3));

System.out.println("the area of the circle? " + ((Circle)list.get(0)).getArea());

}

}

/*

kolya@asus ~/src/Introduction-to-Java-Programming $ java chap9/TestArrayList

List size? 6

is Toronto in the list? true

the location of new york in the list is 1

is the list empty? false

London Beijing Paris Hong Kong Singapore

the area of the circle? 12.566370614359172

*/