java的int[] array、List＜Integer＞、Set＜Integer＞互转

    public void test(){
        int[] array = {1, 2, 3, 4, 5, 6, 7};
 
        /*int[]转list*/
        //方法一：需要导入apache commons-lang3  jar 
        List<Integer> list = Arrays.asList(ArrayUtils.toObject(array));
        //方法二：java8及以上版本
        List<Integer> list1 = Arrays.stream(array).boxed().collect(Collectors.toList());
 
        /*list转int[]*/
        //方法一：
        Integer[] intArr =  list.toArray(new Integer[list.size()]);
        //方法二：java8及以上版本
        int[] intArr1 =  list.stream().mapToInt(Integer::valueOf).toArray();
		
		//array转set
		Set<Integer> sets = new HashSet<>(Arrays.stream(array).boxed().collect(Collectors.toList()));
		//set转array
		Integer arrayInt = sets.toArray(new Integer[sets.size()]);
		System.out.println("dest: " + Arrays.toString(dest));
        
    }