2023.7.16

 1 import java.sql.SQLOutput;
 2 import java.util.Scanner;
 3 //数组的使用
 4 public class test {
 5     public static void main(String[] args)
 6     {
 7         int[] arrays = {1,2,3,4,5};
 8         //for_each循环
 9         for (int array : arrays) {//使用时可以写为arrays.for回车
10             System.out.print(array);
11         }
12         System.out.println("//for_each循环===========");
13         //可以作为参数
14 
15         System.out.print("max = "+max(arrays));
16         System.out.println(" //可以作为参数===========");
17 
18         //可以作为返回值类型
19         for (int i : reverse(arrays)) {
20             System.out.print(i);
21         }
22         System.out.println("//可以作为返回值类型===========");
23     }
24     public static int max(int[] arrays){
25         int max = arrays[0];
26         for (int i = 1; i < arrays.length; i++) {
27             if(arrays[i]>max){
28                 max = arrays[i];
29             }
30         }
31         return max;
32     }
33    //反转数组
34     public static int[] reverse(int[] arrays){
35         int[] ret = new int[arrays.length];
36         int n = arrays.length-1;
37         for (int i = 0; i < arrays.length; i++) {
38             ret[i] = arrays[n];
39             n--;
40         }
41         return ret;
42     }
43 }