谁帮我编写一个java程序：

孩子，程序只有自己敲过，才有收获，总不能以后总找人写程序吧~

public class Test {
public static void main(String[] args) throws IOException
{
//写到文件中
FileWriter file=new FileWriter("D:\\data.txt");
PrintWriter out=new PrintWriter(file,true);
Scanner keyIn=new Scanner(System.in);
for(int i=0;i<5;i++)
{
int temp=keyIn.nextInt();
out.println(temp);
}
file.close();
out.close();
//读取文件内容
FileReader in=new FileReader("D:\\data.txt");
Scanner cin=new Scanner(in);
int[] arr=new int[5];
int i=0;
int sum=0;
while(cin.hasNextInt())
{
arr[i]=cin.nextInt();
sum+=arr[i];
i++;
}
//平均值
double average=sum/5.0;
System.out.println("平均值是"+average);
//排序
Arrays.sort(arr);
System.out.println(Arrays.toString(arr));

}
}