public static void main(String[] args) {

    String[] arr={"apple","pear"};

    List<String> list=Arrays.asList(arr);

    System.out.println(list.size()); //===>2

}

package com.cmc.util;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

public class listUtil {

    public static void main(String[] args) {

        List<String> list = new ArrayList<String>();

        list.add("str1");

        list.add("str2");

        int size=list.size();

        String[] arr2= list.toArray(new String[size]);  //*** 设置数组的大小

        for (int i = ; i < arr2.length; i++) {

            System.out.println("==arr2==:"+arr2[i]);

        }

    }

}