Lab Max-Min

iimport java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
public class Untitled2
{
public static void main(String[] args) throws IOException
{
System.out.println("要輸入幾個數字?");
BufferedReader keyboard= new BufferedReader(new InputStreamReader(System.in));
String inputString = keyboard.readLine();
int x = Integer.parseInt(inputString);
System.out.println("輸入 "+x+" 個數字");
BufferedReader keyboard1= new BufferedReader(new InputStreamReader(System.in));
String inputString1 = keyboard1.readLine();
double x1 = Double.parseDouble(inputString1);
BufferedReader keyboard2= new BufferedReader(new InputStreamReader(System.in));
String inputString2 = keyboard2.readLine();
double x2 = Double.parseDouble(inputString2);
int i=x;
double max,min;
if(x2>x1)
{
max=x2;
min=x1;
}
else
{
max=x1;
min=x2;
}
for(i=x;i>2;i--)
{
BufferedReader keyboard3= new BufferedReader(new InputStreamReader(System.in));
String inputString3 = keyboard3.readLine();
double x3 = Double.parseDouble(inputString3);
if((x3>x1)&&(x3>x2))
max=x3;
else if((x3 min=x3;
}
System.out.println("max="+max);
System.out.println("min="+min);
}
}