import java.util.*;
import java.util.stream.Collectors;
import static java.util.Arrays.*;
public class ZhuanHuan{
public static void main(String[] args) {
//数组: int[]
int[] arrayInt = new int[]{1,2,3,4,5,6};
printElement(arrayInt);
//原生数组转包装类数组: int[] 2 Integer[]
Integer[] arrayInter = Arrays.stream(arrayInt).boxed().toArray(Integer[]::new);
printElement(arrayInter);
//*包装类数组转List/ArrayList: Integer[] 2 List<Integer>
List<Integer> listInter = Arrays.asList(arrayInter);
printElement(listInter);
//*List/ArrayList转包装类数组: List<Integer> 2 Integer[]
Integer[] arrayInter2 = listInter.toArray(new Integer[listInter.size()]);
printElement(arrayInter2);
//包装类数组转原生数组: Integer[] 2 int[]
int[] arrayInt2 = Arrays.stream(arrayInter2).mapToInt(Integer::valueOf).toArray();
printElement(arrayInt2);
//原生数组转List/ArrayList: int[] 2 List<Integer>
List<Integer> listInter2 = Arrays.stream(arrayInt2).boxed().collect(Collectors.toList());
printElement(listInter2);
//List/ArrayList转原生数组: List<Integer> 2 int[]
int[] arrayInt3 = listInter2.stream().mapToInt(Integer::valueOf).toArray();
printElement(arrayInt3);
}
//原生数组遍历输出
private static void printElement(int[] arr){
for(int i=0;i<arr.length;i++){
System.out.println(arr[i]);
}
}
//包装类数组遍历输出
private static void printElement(Integer[] arr){
for(int i=0;i<arr.length;i++){
System.out.println(arr[i]);
}
}
//List遍历输出
private static void printElement(List list){
Iterator iter = list.iterator();
while(iter.hasNext()){
System.out.println(iter.next());
}
}
}
标签:原生,遍历,包装,List,int,数组,Integer,printElement
From: https://www.cnblogs.com/rosetta/p/16824545.html