方法remove(int)在Java中做什么?
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)。
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);
}
}
}
输出结果
Size of list: 4Number = 20
Number = 15
Number = 30
Number = 45
Now, Size of list: 3
Number = 20
Number = 15
Number = 45
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