ArrayList的用法，初始容量10

new ArrayList()：初始容量是10

package day20200818;

import java.util.ArrayList;

public class Demo03 {
    
    
	public static void main(String[] args) {
    
    
		ArrayList<String> al = new ArrayList<String>();
		al.add("apple");
		al.add("orange");
		al.add("banana");
		System.out.println(al.size());
		al.add(1, "car");
		System.out.println(al);
		al.remove(2);
		System.out.println(al);
	}

}