顺序表查找及其优化（Java）

private static void Ordersearch(int[] arr,int num) {
for (int i = 0; i < arr.length; i++) {
if (arr[i]==num) {
System.out.println(arr[i]);
return;
}
}
System.out.println("not found ");

}

private static void Ordersearch(int[] arr,int num) {
int count=arr.length-1;
int min=arr[0];
arr[0]=num;
while(arr[count]!=num){
count--;
}
if (min==arr[count]) {
System.out.println(arr[count]);
}else {
System.out.println("not found");
}
}