数组的使用 

 1 package com.pingfan.array;
 2 
 3 public class ArrayDemo3 {
 4     public static void main(String[] args) {
 5         int[] arrays = {1,2,3,4,5};
 6         //打印全部的数组元素
 7         for (int i = 0; i < arrays.length; i++) {
 8             System.out.println(arrays[i]);
 9         }
10         System.out.println("=========");
11         //计算所有元素的和
12         int sum = 0;
13         for (int i = 0; i < arrays.length; i++) {
14             sum = sum + arrays[i];
15         }
16         System.out.println("sum" + sum);
17         System.out.println("=========");
18         //查找最大元素
19         int max = arrays[0];
20 
21         for (int i = 1; i < arrays.length; i++) {
22             if (arrays[i]>max){
23                 max = arrays[i];
24             }
25         }
26         System.out.println("max=" + max);
27     }
28 }
 1 package com.pingfan.array;
 2 
 3 public class ArrayDemo4 {
 4     public static void main(String[] args) {
 5         int[] arrays = {1,2,3,4,5};
 6 //        //JDK1.5  没有下标
 7 //        for (int array : arrays) {
 8 //            System.out.println(array);
 9 //        }
10         //printArray(arrays);
11         int[] reverse = reverse(arrays);
12         printArray(reverse);
13     }
14     //反转数组
15     public static int[] reverse(int[] arrays){
16         int[] result = new int[arrays.length];
17 
18         //反转的操作
19         for (int i = 0,j = result.length-1; i < arrays.length; i++,j--) {
20             result[j] = arrays[i];
21         }
22         return result;
23     }
24 
25 
26     //打印数组元素
27     public static void printArray(int[] arrays){
28         for (int i = 0; i < arrays.length; i++) {
29             System.out.println(arrays[i] + " ");
30         }
31     }
32 }

 

posted @ 2021-04-30 10:23  HeartlessHero  阅读(50)  评论(0)    收藏  举报