12.基础编程：将一个数组逆序输出。

1.代码 

package demo12;

import java.util.Arrays;

//12、将一个数组逆序输出。
public class Demo12 {
    public static void main(String[] args) {
        Integer[] arr1 = {1, 2, 3, 4, 5};
        reverse(arr1);
        String[] arr2 = {"令狐冲","任盈盈","仪琳"};
        reverse(arr2);
    }

    private static  void reverse(T[] arr) {
        T temp;
        for (int i = 0; i < arr.length / 2; i++) {
            temp = arr[i];
            arr[i] = arr[arr.length - i - 1];
            arr[arr.length - i - 1] = temp;
        }
        System.out.println(Arrays.toString(arr));
    }

}

2.测试结果：

"D:\Program Files\Java\jdk-9.0.4\bin\java.exe" "-javaagent:D:\Program Files\JetBrains\IntelliJ IDEA 2018.2.5\lib\idea_rt.jar=61932:D:\Program Files\JetBrains\IntelliJ IDEA 2018.2.5\bin" -Dfile.encoding=UTF-8 -classpath E:\Java练习\基础类型题\chap01\out\production\Java练习 demo12.Demo12
[5, 4, 3, 2, 1]
[仪琳, 任盈盈, 令狐冲]

Process finished with exit code 0