05、数组的使用

package com.wzt.www.array;

import java.util.Arrays;

/**
 * @author WZT
 * @create 2021-03-26 18:06
 */
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);
        System.out.println("=========================");
        printArray(reserve(arrays));
    }

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

        }
    }
    //翻转数组
    public static int[] reserve(int[] a){
    
    
        int[] result = new int[a.length];
        //翻转操作
        for (int i = 0,j = a.length-1; i < a.length; i++,j--) {
    
    
            result[j] = a[i];

        }
        return result;
    }
}

输出

1
2
3
4
5
=========================
5
4
3
2
1

Process finished with exit code 0

#常规操作

package com.wzt.www.array;

/**
 * @author WZT
 * @create 2021-03-26 18:06
 */
public class ArrayDemo03 {
    
    
    public static void main(String[] args) {
    
    
        int[] array = {
    
    1,2,3,4,5};

        //打印所有元素
        for (int i = 0; i < array.length; i++) {
    
    
            System.out.println(array[i]);}

        System.out.println("===================");
        //计算所有元素的和
           int sum = 0;
            for (int i = 0; i < array.length; i++) {
    
    
                sum += array[i];
                
            }
        System.out.println("和为："+sum);

        System.out.println("======================");

            int max = array[0];
        for (int i = 1; i < array.length; i++) {
    
    
            if (max<array[i]){
    
    
                max = array[i];
            }

        }
        System.out.println("最大值为："+max);
        }
    }

输出

1
2
3
4
5
===================
和为：15
======================
最大值为：5

Process finished with exit code 0