代码:
package com.zhiyou100.test; import org.junit.Test; import java.util.*; publicclasstestarraylistandarray { @ testpublicvoidtest () /数组转换集合//Arrays.asList (数组元素1、数组元素2、数组元素3、数组元素4、数组元素5、) system.out.println(list1: ) list1; //Collections.addAll (集合名称、数组名称); integer [ ] arr={ 12,321,1,5,87,80,57 }; arraylistintegerlist2=new ArrayList (; collections.addall (列表2,arr ); system.out.println(list2: ) list2; //遍历,每人addarraylistintegerlist3=new ArrayList (; for(integerI:ARR ) list3.add ) I; }system.out.println(list: ) list3); //以集合数组list2为例//toArray方法Object[] objects=list2.toArray (; system.out.println (Objects ' arrays.tostring ) objects ); //integer [ ] integers=new integer [ list2. size (]; for(intI=0; i list2.size (; I({integers[I]=list2.get ) I; } system.out.println (integers ' arrays.tostring ) integers ); }运行结果: