如何在 Java 中查找ArrayList的长度

通过使用ArrayList size() ArrayList类的方法，我们可以很容易地确定ArrayList的大小。此方法返回ArrayList的元素数。

public int size()

示例：

package beginnersbook.com;import java.util.ArrayList;public class Details{    public static void main(String [] args)    {        ArrayList<Integer> al=new ArrayList<Integer>();        System.out.println("Initial size: "+al.size());        al.add(1);        al.add(13);        al.add(45);        al.add(44);        al.add(99);        System.out.println("Size after few additions: "+al.size());        al.remove(1);        al.remove(2);        System.out.println("Size after remove operations: "+al.size());        System.out.println("Final ArrayList: ");        for(int num: al){            System.out.println(num);        }   }}

输出：

Initial size: 0Size after few additions: 5Size after remove operations: 3Final ArrayList: 14599