2023.7.18 周二：Arrays类

 1 import java.sql.SQLOutput;
 2 import java.util.Arrays;
 3 import java.util.Scanner;
 4 //Arrays类
 5 public class test {
 6     public static void main(String[] args) {
 7        int[] a = {5,4,6,8,9,1,7,2,3} ;
 8        //打印数组元素
 9         Arrays.toString(a);
10         System.out.println(Arrays.toString(a));
11 
12         Arrays.sort(a);//对数组进行升序排序
13         System.out.println(Arrays.toString(a));
14 
15         int index = Arrays.binarySearch(a,5);//二分查找
16         System.out.println("index = "+index);
17 
18         Arrays.fill(a,2,4,0);//数组的填充(2-4之间的元素被填充)
19         System.out.println(Arrays.toString(a));
20         
21     }
22 }