数组不能在方法中实现保存
```java
package week15_activity3;
import java.util.Scanner;
public class menu_driven {
public static void main(String[] args) {
while(true){
System.out.println("1:Accept elements of an array from the user\n" +
"2:Display elements of the array \n" +
"3:Search an element given by the user within that array \n" +
"4:Sort the array using the bubble sort method.\n"+
"Please choose you need:");
Scanner s = new Scanner(System.in);
int a = s.nextInt();
switch (a){
case 1:
int array[] = accept();
continue;
case 2:
display(array);
continue;
case 3:
search(array);
continue;
case 4:
sort1(array);
continue;
case 5:
break;
}
}
}
public static int[] accept() {
Scanner s1 = new Scanner(System.in);
System.out.println("请输入数组(空格隔开):");
String str = s1.next();
String[] arr = str.split(" ");
int[] b = new int[arr.length];
for (int j = 0; j < b.length; j++) {
b[j] = Integer.parseInt(arr[j]);
}
return b;
}
public static void display(int[] a){
System.out.println("该数组内容:");
for (int i = 0; i < a.length; i++) {
System.out.println(a[i]+" ");
}
}
public static void search(int[] a){
Scanner s2 = new Scanner(System.in);
System.out.println("请输入要查找的数:");
int index = s2.nextInt();
int flag = 0;
for (int i = 0; i < a.length; i++) {
if(index == a[i]){
System.out.println("已找到,该元素在数组中的下标为:"+i+"\n");
flag = 1;
break;
}
}
if(flag == 0){
System.out.println("未找到该元素\n");
}
}
public static void sort1(int[] a){
for (int i = 0; i < a.length; i++) {
for (int j = 1;j<a.length-i;j++){
if(a[j-1]>a[j]){
int t = a[j-1];
a[j-1] = a[j];
a[j] = t;
}
}
}
System.out.println("已排序,排序结果为:");
for (int i = 0; i < a.length; i++) {
System.out.println(a[i]);
}
}
}
```