```
import java.util.Scanner;
public class TestArray03{
public static void main(String[] agrs){
int arr[]={12,3,7,4,8,125,9,45};
int a=maxNum(arr);
System.out.println(a);
}
public static int maxNum(int arr[]){
//封裝的函數
int maxNum=arr[0];
for(int i=0;i<arr.length;i++){
if(arr[i]>maxNum){
maxNum=arr[i];
}
}
return maxNum;
}
}
```
