java的小問題

我檢查了好幾次

可是編譯時一直出現 home5.java:37: illegal start of expression

請高手指點一下

import java.util.*;
import javax.swing.*;

class home5{

long x = 0;
long n = 0;
long sum = 0;
long etime = 0;

Date startTime, endTime;

public home5(){
start();
}

(這排有問題)private void start(){
x=Long.parseLong(JOptionPane(null, "Input x"));
n=Long.parseLong(JOptionPane(null, "Input n"));

if(x<=0)
x = 0;
if(n<=0)
n = 0;

startTime = new Date();

for(int i=n; i>0 ; i--){
sum = sum+(x^i)/fact(n);
}

sum++;

endTime = new Date();
etime = endTime.getTime() - startTime.getTime();

private long fact(long m){
if(m == 1){
return 1;
}else{
m = m*fact(m-1);
}
}

public static void main(String[] args){
home5 home = new home5();

System.out.println("The sum of e^x is" + sum);
System.out.println("Time used" + etime);
}
}