java.util.Arrays
static void sort(Object[] a)
static void sort(Object[] a, int fromIndex, int toIndex)
static <T> void sort(T[] a, Comparator<? super T> c)
static <T> void sort(T[] a, int fromIndex, int toIndex, Comparator<? super T> c)
String
static String toString(Object[] a)
static String deepToString(Object[] a)
static void fill(Object[] a, Object val)
static void fill(Object[] a, int fromIndex, int toIndex, Object val) // [from, to)
static boolean equals(Object[] a, Object[] a2)
static boolean deepEquals(Object[] a1, Object[] a2)
List
static <T> List<T> asList(T... a) //
这里有两个坑:
int[] array = new int[]{3, 10, 4, 0, 2};
List<int[]> ints = Arrays.asList(array);
Integer[] arr = new Integer[]{3, 10, 4, 0, 2};
List<Integer> integers = Arrays.asList(arr);
List
是Arrays.ArrayList
,不是java.util.ArrayList
,不可以增删改,需要再包装一个成 ArrayList。static <T> T[] copyOf(T[] original, int newLength)
static <T> T[] copyOfRange(T[] original, int from, int to)
static int binarySearch(Object[] a, Object key)
static int binarySearch(Object[] a, int fromIndex, int toIndex, Object key)
// Returns a hash code based on the contents of the specified array.
static int hashCode(Object[] a)