ArrayListDemo.java

packageLecture7;

importjava.util.ArrayList;

publicclassArrayListDemo {

publicstaticvoidmain(String[] args) {

ArrayList<Integer> list = newArrayList<Integer>();

System.out.println(list); // []

list.add(10);

System.out.println(list); // [10]
System.out.println(list.size()); // 1

list.add(20);

System.out.println(list); // [10, 20]
System.out.println(list.size()); // 2

list.add(30);

System.out.println(list); // [10, 20, 30]
System.out.println(list.size()); // 3

list.add(40);

System.out.println(list); // [10, 20, 30, 40]
System.out.println(list.size()); // 4

list.add(50);

System.out.println(list); // [10, 20, 30, 40, 50]
System.out.println(list.size()); // 5

// displaying elements in list
System.out.println();
for (inti = 0; i < list.size(); i++) {
System.out.print(list.get(i) + " ");
 }

System.out.println("\n");
System.out.println("test");
System.out.println(list.get(0)); // 10

System.out.println("before removing size is: " + list.size());
System.out.println();
list.remove(2);
System.out.println(list); // [10, 20, 40, 50]
System.out.println("after removing size is: " + list.size());

System.out.println("\n adding 30 in 2nd index position");
list.add(2, 30);
System.out.println(list); // [10, 20, 30, 40, 50]

System.out.println();
System.out.println(list.remove(0)); // 10
System.out.println(list); // [20, 30, 40, 50]


 }
}