2023.7.18 周二：Arrays类

import java.sql.SQLOutput;
import java.util.Arrays;
import java.util.Scanner;
//Arrays类
public class test {
    public static void main(String[] args) {
       int[] a = {5,4,6,8,9,1,7,2,3} ;
       //打印数组元素
        Arrays.toString(a);
        System.out.println(Arrays.toString(a));

        Arrays.sort(a);//对数组进行升序排序
        System.out.println(Arrays.toString(a));

        int index = Arrays.binarySearch(a,5);//二分查找
        System.out.println("index = "+index);

        Arrays.fill(a,2,4,0);//数组的填充(2-4之间的元素被填充)
        System.out.println(Arrays.toString(a));
        
    }
}