数组的使用

/**
 * @Description 数组的使用
 */
package com.aifu.array;

public class ArrayDemo04 {
    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 = 0; i < arrays.length; i++) {
            if (arrays[i]>max){
                max = arrays[i];
            }
        }

        System.out.println("max="+max);
    }
}

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/**
 * @Description 数组的使用
 */
package com.aifu.array;

public class ArrayDemo05 {
    public static void main(String[] args) {
        int[] arrays = {1, 2, 3, 4, 5};

        //JDK1.5,没有下标
        /*     foreach循环
        for (int array : arrays) {
            System.out.println(array);
        }
        */
        int[] reverse = reverse(arrays);
        printArray(reverse);
    }


    //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;
    }

    //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] + " ");
        }
    }
}

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