关于for循环效率的问题
那位大神能帮忙解释一下
一般都是外层循环小内层循环大的效率会比外层大内层小快，但是如果用一个循环为什么会比用两个循环慢呢，而且会慢很多
import java.util.Date;
public class sssfda {
public static void main(String[] args) {
long i;
long time1=System.nanoTime();
for (i = 0; i < 1000000000; i++) {
}
long time2=System.nanoTime();
System.out.println(i);
System.out.println(time2-time1);
long k = 0;
long time3=System.nanoTime();
for (int o = 0; o < 10000000; o++) {
for (int b = 0; b < 100; b++) {
k = k + 1;
}
}
long time4=System.nanoTime();
System.out.println(k);
System.out.println(time4-time3);
long f = 0;
long time5=System.nanoTime();
for (int o = 0; o < 100; o++) {
for (int b = 0; b < 10000000; b++) {
f = f + 1;
}
}
long time6=System.nanoTime();
System.out.println(f);
System.out.println(time6-time5);
}
}
1000000000
3743415992
1000000000
1709059112
1000000000
1564084821
[解决办法]
