java.util.ArrayList类的 remove(int index)方法删除此列表中指定位置的元素。将所有后续元素向左移动(从其索引中减去一个)。
import java.util.ArrayList; public class ArrayListDemo { public static void main(String[] args) { ArrayList<Integer> arrlist = new ArrayList<Integer>(5); arrlist.add(20); arrlist.add(15); arrlist.add(30); arrlist.add(45); System.out.println("Size of list: " + arrlist.size()); for (Integer number : arrlist) { System.out.println("Number = " + number); } arrlist.remove(2); System.out.println("Now, Size of list: " + arrlist.size()); for (Integer number : arrlist) { System.out.println("Number = " + number); } } }
输出结果
Size of list: 4 Number = 20 Number = 15 Number = 30 Number = 45 Now, Size of list: 3 Number = 20 Number = 15 Number = 45