ArrayList的扩容

import java.util.*;public class TestJcf{public static void main(String []args){        List<Integer>list = new ArrayList<Integer>(50);        Collections.addAll(list,1,2,3,4,5);        Collections.sort(list);        list.forEach(System.out::println);}}//可变参/*public void addAll(List<Integer> list,Integer...data ){for(Integer x:data){list.add(x);}}*/