java 中的 remove(int) 方法的作用是什么?
java.util.ArrayList 类的remove(int index) 方法移除此列表中指定位置的元素。将任意后续元素向左移动(从其索引中减一)。
示例
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
Size of list: 4 Number = 20 Number = 15 Number = 30 Number = 45 Now, Size of list: 3 Number = 20 Number = 15 Number = 45
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