Java learning - common class (Arrays)

An output array element --toString ()

int[] arr1 = {1,2,3};
System.out.println(Arrays.toString(arr1));

Second, compare the array elements --equals ()

int[] arr1 = {1,2,3};
int[] arr2 = {1,2,3};
System.out.println(Arrays.equals(arr1,arr2));

Third, the array elements in ascending order --sort ()

int[] arr1 = {1,3,2};
Arrays.sort(arr1);
System.out.println(Arrays.toString(arr1));

Fourth, the array to a set --asList ()

int[] arr1 = {1,3,2};
List<int[]> li = Arrays.sort(arr1);
System.out.println(li.get(1)); // 3