5.数组的使用,最值和反转

package com.duan.array;

public class ArrayDemo03 {
    public static void main(String[] args) {
        int[] arrays = {1, 2, 3, 4, 5};

        //打印全部的数组元素
        for (int i = 0; i < arrays.length; i++) {
            System.out.println(arrays[i]);
        }
        System.out.println("=================");
        //计算所有元素的和
        int sum = 0;
        for (int i = 0; i < arrays.length; i++) {
            sum += arrays[i];
        }
        System.out.println("sum=" + sum);
        System.out.println("==================");
        //查找最大元素
        int max = arrays[0];
        for (int i = 1; i < arrays.length; i++) {
            if (arrays[i] > max) {
                max = arrays[i];
            }
        }
        System.out.println("max=" + max);
    }
}
结果：
1
2
3
4
5
=================
sum=15
==================
max=5

package com.duan.array;

public class ArrayDemo04 {
    public static void main(String[] args) {
        int[] arrays = {1, 2, 3, 4, 5};
        //for (int array : arrays) {
        //    System.out.println(array);
        //}

        printArray(arrays);
        int[] reverse = reverse(arrays);
        System.out.println();
        printArray(reverse);
    }

    //打印数组元素
    public static void printArray(int[] arrays) {
        for (int i = 0; i < arrays.length; i++) {
            System.out.print(arrays[i] + " ");
        }
    }

    //反转数组
    public static int[] reverse(int[] arrays) {
        int[] result = new int[arrays.length];

        //反转的操作
        for (int i = 0, j = result.length - 1; i < arrays.length; i++, j--) {
            result[j] = arrays[i];
        }

        return result;
    }
}
结果：
1 2 3 4 5 
5 4 3 2 1