JavaSE_List&Array_Java1.7

这里简单写了下List和Array的相互转换

 package cn.rocker.collection.list;

 import org.junit.Test;

 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;

 /**
  * @author rocker
  * @version V1.0
  * @Description:
  * @date 2018/5/7 21:01
  */
 public class ArrayListDemo1 {
     @Test
     /**
      * @Description:    ArrayList转换成数组
      * @auther: rocker
      * @date: 2018/5/7 21:20
      */
     public void test1(){
         List<Object> list = new ArrayList<>();
         list.add(6);
         list.add(2);
         list.add(7);
         list.add(4);
         //list转成数组
         Object[] objects = list.toArray();
         //对转换后的数组进行排序
         Arrays.sort(objects);
         System.out.println(Arrays.toString(objects));
     }

     @Test
     /**
      * @Description:    数组转换成List,
      *                  需要注意的是asList(arr)的参数arr的元素不能为基本类型
      *                  short|int|long|float|double|byte|char|boolean
      * @auther: rocker
      * @date: 2018/5/7 21:20
      */
     public void test2(){
         int[] arr1 = {1,2,3};
         List<int[]> list = Arrays.asList(arr1);
         System.out.println(list.size());

         char[] arr2 = {'a','b','c'};
         List<char[]> chars = Arrays.asList(arr2);
         System.out.println(chars.size());

         String[] arr3 = {"d","e","f"};
         List<String> strings = Arrays.asList(arr3);
         System.out.println(strings.size());
     }
 }