根据要求,完成相应操作 - 黑马程序员技术交流社区

package Exercise_0311;
import java.util.Scanner;
public class Test_Homework {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请指定数组长度:");
int a = sc.nextInt();
int[] arr = new int[a];
System.out.println("请输入数组:");
for (int i = 0; i < arr.length; i++) {
arr[i] = sc.nextInt();
}
System.out.print("原来数组:");
printArray(arr);
System.out.println();
System.out.println("请输入你需要的操作:");
System.out.println("-------------------------------------------");
System.out.println("1.反转" + "\n" + "2.查找" + "\n" + "3.找最大值");
System.out.println("------------input 886 end------------------");
int x = sc.nextInt();
if (x == 1) {
System.out.println();
exchangeArray(arr);
System.out.print("反转之后数组数组:");
printArray(arr);
} else if (x == 2) {
System.out.println();
System.out.println("请输入你要查找的内容:");
int b = sc.nextInt();
searchArray(arr, b);
} else if (x == 3) {
System.out.println();
int max = arr[0];
getMax(arr, max);
} else if (x == 886) {
System.out.println("goodbye!");
} else {
System.out.println("输入错误!");
}
}
public static void printArray(int[] arr) {
for (int i = 0; i < arr.length; i++) {
System.out.print(arr[i] + " ");
}
}
public static void exchangeArray(int[] arr) {
for (int i = 0; i < arr.length / 2; i++) {
int temp = arr[i];
arr[i] = arr[arr.length - i - 1];
arr[arr.length - i - 1] = temp;
}
}
public static void searchArray(int[] arr, int b) {
boolean c = false;
int d = 0;
for (int i = 1; i < arr.length; i++) {
if (b == arr[i]) {
d = i;
break;
} else {
d = 0;
}
}
if (d == 0) {
System.out.println("输入错误");
} else {
System.out.println(b + "第一次出现的索引位置是:" + (d + 1));
}
}
private static void getMax(int[] arr, int max) {
max = arr[0];
for (int i = 0; i < arr.length; i++) {
if (max < arr[i]) {
max = arr[i];
}
}
System.out.println("最大值是:" + max);
}
}

复制代码