為什么這段相同邏輯的代碼，java的竟然比lua快那么多？

為什么這段相同邏輯的代碼在同一個(gè)機(jī)子上運(yùn)行時(shí)，java的竟然比lua快那么多？

Java代碼：

import java.lang.Math;
import java.util.*;
import java.util.Date;

public class Test {
    public int isprime(int num){
       int count = (int) Math.sqrt(num);
       while (count >1){
           if (num % count == 0){
               return 0;
           }
           count -= 1;
       }
       return 1;
     }
     
     public static void main(String[] args) {
         Test t = new Test();
         Date begin = new Date();         
         for (int i=0;i<100000;i++){
             t.isprime(i);
         }
         Date end = new Date();
         long interval = end.getTime() - begin.getTime();
         System.out.println(begin.getTime());
         System.out.println(end.getTime());
         System.out.println(interval);
     
 }
}

輸出：
1516427548266
1516427548329
63

Lua代碼：

function isprime(num)
    t1,t2 = math.modf(math.sqrt(num));
    while (t1 > 1)
    do
        if (num % t1 == 0) then
            return 0;
        end
        t1 = t1 - 1;
    end

    return 1;
end

time1 = os.clock();
print(time1);

for i=2,100000,1 do
    isprime(i);
end

time2 = os.clock();
print(time2);

print((time2 - time1));

輸出：
lua -e "io.stdout:setvbuf 'no'" "test.lua"
0.001
1.464
1.463
Exit code: 0