一、list、int[]、Integer[]
1.1 list转int[]
int[] arr = list.stream().mapToInt(Integer::valueOf).toArray();
1.2 list转Intefer[]
Integer[] integers = list.toArray(new Integer[0]);
1.3 int[]转Integer[]
int[] arr={1,2,3};
Integer[] integers = Arrays.stream(arr).boxed().toArray(Integer[]::new);
1.4 int[]转list
int[] arr={1,2,3};
List list = Arrays.stream(arr).boxed().collect(Collectors.toList());
1.5 Integer[]转int[]
Integer[] integers={1,2,3};
int[] arr = Arrays.stream(integers).mapToInt(Integer::valueOf).toArray();
1.6 Integer[]转list
Integer[] integers={1,2,3};
List list = Arrays.asList(integers);
二、list、String[]
2.1 String[]转list
String[] strs={"1","2","3"};
List list3 = Arrays.asList(strs);
2.2 list转String[]
String[] strs = list.toArray(new String[0]);
![Java中list、int[]、Integer[]与list、String[]相互转换](http://www.mshxw.com/aiimages/31/343279.png "Java中list、int[]、Integer[]与list、String[]相互转换")
