数组常见操作【最大/最小/数据反转操作】

import java.util.Scanner;

public class day_4_5 {
    public static void main(String[] args) {
        /*数组的常见操作*/
        //遍历
        int[] arr = {3, 5, 2, 1, 4};
        int max = arr[0];
        int max1 = 0;
        int max2 = 0;
        for (int i = 0; i < arr.length; i++) {
            System.out.println(arr[i]);
        }
        //取数组中的最大值
        for (int i = 1; i < arr.length; i++) {
            if (max < arr[i]) {
                max = arr[i];
            }
        }
        ;
        System.out.println(max);
        for (int i = 1; i < arr.length; i++) {
            if (arr[max1] < arr[i]) {
                max1 = i;
            }
        }
        ;
        System.out.println(arr[max1]);
        //取数组中的最小值
        for (int i = 1; i < arr.length; i++) {
            if (arr[max2] > arr[i]) {
                max2 = i;
            }
        }
        ;
        System.out.println(arr[max2]);
        //查询输入的数据是否在数组中存在
//        Scanner sc = new Scanner(System.in);
//        System.out.println("请输入一个数字:");
//        int num = sc.nextInt();
//        int[] arr4 = {1, 2, 3, 4, 5};
//        for (int i = 0; i < arr4.length; i++) {
//            if (num == arr4[i]) {
//                System.out.println("数据存在");
//                break;
//            }
//        }

        int[] arr5 = {1, 2, 3, 4, 5};
        //反转前
        for(int i = 0; i < arr5.length;i++){
            System.out.print(arr5[i] + " ");
        }
        //数组反转
        for (int i = 0, j = arr5.length - 1; i < arr5.length / 2; i++, j--) {
            int temp = arr5[i];
            arr5[i] = arr5[j];
            arr5[j] = temp;
        }
        //反转后
        for(int i = 0; i < arr5.length;i++){
            System.out.print(arr5[i] + " ");
        }
    }
}