Java Arrays类

 1 package demo04;
 2
 3 import java.util.Arrays;
 4
 5 public class ArraysDemo {
 6     public static void main(String[] args) {
 7
 8         //static void sort(任意类型数组) 对数组升序排列
 9         int[] arr = {5,1,2,6,3};
10         Arrays.sort(arr);
11         for (int i = 0; i < arr.length; i++) {
12             System.out.println(arr[i]);
13         }
14
15         //static int binarySearch(数组, 被查找的有序数组) 二分查找 返回负数(-插入点-1)
16         int[] arr1 = {1,2,3,4,5,6};
17         int index = Arrays.binarySearch(arr1, 3);
18         System.out.println(index);
19
20         //static String toString(数组) 将数组转为字符串
21         int[] arr2 = {1,2,3,4,5,6};
22         String s = Arrays.toString(arr2);
23         System.out.println(s);
24
25     }
26 }