static int binarySearch (type [] a, type key) using the binary search method to search the index key element in the array; if the array does not include a key, returns a negative number. (This method must be invoked by the ascending order).
static int binarySearch (type [] a, int fromIndex, int toIndex, type key) using the binary search method to search for the key element in an array to toIndex from fromIndex index; if the array does not include a key, returns a negative number. (This method must be invoked by the ascending order).
static boolean [] copyOf (type [] original, int newLength) Copies the specified array See notes below
static byte [] copyOfRange (type [] original, int from, int to) copies the specified range of the array into a new array.
static boolean equals (type [] a, type [] a2) if the two arrays are equal in length and eleven elements are equal Returns true
static void fill (type [] a, type val) Ode to all array elements is a val.
static void fill (type [] a, int fromIndex, int toIndex, type val) from the formIndex to a array element Ode between tiondex index val.
static void sort (type [] a) // sort (int [] arr) the specified array into ascending numerical order.
static void sort (type [] a, int fromIndex, int toIndex) to be specified array into ascending numerical order from the element between tiondex formIndex index.
static String toString (type [] a) Returns a string representation of the contents of an array. Separated by commas or spaces between the plurality of array elements.
My summary: using array tools can save time, improve efficiency, pay attention to regular inspection API ;
Eg：
package reviewDemo;
import java.util.Arrays;
// use the Arrays class
public class Demo4 {
public static void main(String[] args) {
int[] age = new int[] { 12, 26, 3, 60, 55, 6, 48, 4, 98 };
The System. OUT .println (Arrays,. ToString (Age)); // printing out an array of methods
int [] = {1,2,3,4,5,6,98,65,23 AGE2};
int i = Arrays.binarySearch(age2, 98);
System.out.println(i);
}
}