遍历List效率分析

/*使用迭代器去遍历*/ 
long time1 = System.nanoTime(); 
Iterator<ApiResponse> iterator = spiderResults.iterator(); 
while (iterator.hasNext()){ 
 System.out.println(iterator.next()); 
} 
System.out.println("Iterater程序耗时："+(System.nanoTime()-time1)+" ms"); 
/*使用foreach循环去遍历*/ 
long time2 = System.nanoTime(); 
for(ApiResponse i:spiderResults) 
{ 
} 
System.out.println("Foreach程序耗时："+(System.nanoTime()-time2)+" ms"); 
/*使用for循环遍历*/ 
long time3 = System.nanoTime(); 
for(int l=0;l<spiderResults.size();l++){ 
 ApiResponse o = spiderResults.get(l); 
} 
System.out.println("For循环程序耗时："+(System.nanoTime()-time3)+" ms"); 
/*使用Stream遍历*/ 
long time4 = System.nanoTime(); 
spiderResults.stream().forEach(x->{ 
 Object o = x; 
}); 
System.out.println("Stream程序耗时："+(System.nanoTime()-time4)+" ms");