数组的反转。

public class Demo07_Array {
public static void main(String[] args) {
int[] arr = { 1, 5, 6, 8, 9, 7 };
rev(arr);
}

public static void rev(int arr[]) {
for (int i = 0; i < arr.length / 2; i++) {
int t = arr[i];
arr[i] = arr[arr.length - i - 1];
arr[arr.length - i - 1] = t;

}
for (int i : arr) {
System.out.print(i + "\t");
}
}
}