Java for循环和foreach循环的性能对比分析

for (int i = 0; i < integers.length; i++) {
    System.out.println(intergers[i]);
}

for(Integer in : integers){
    System.out.println(in);
}

public class Main { 
 public static void main(String[] args){
  //实例化arrayList
  List<Integer> arrayList = new ArrayList<Integer>();
  //实例化linkList
  List<Integer> linkList = new LinkedList<Integer>();
 
  //插入10万条数据
  for (int i = 0; i < 100000; i++) {
   arrayList.add(i);
   linkList.add(i);
  }
  
  int array = 0;
  //用for循环arrayList
  long arrayForStartTime = System.currentTimeMillis();
  for (int i = 0; i < arrayList.size(); i++) {
   array = arrayList.get(i);
  }
  long arrayForEndTime = System.currentTimeMillis();
  System.out.println("用for循环arrayList 10万次花费时间：" + (arrayForEndTime - arrayForStartTime) + "毫秒");
  
  //用foreach循环arrayList
  long arrayForeachStartTime = System.currentTimeMillis();
  for(Integer in : arrayList){
   array = in;
  }
  long arrayForeachEndTime = System.currentTimeMillis();
  System.out.println("用foreach循环arrayList 10万次花费时间：" + (arrayForeachEndTime - arrayForeachStartTime ) + "毫秒");
  
  //用for循环linkList
  long linkForStartTime = System.currentTimeMillis();
  int link = 0;
  for (int i = 0; i < linkList.size(); i++) {
   link = linkList.get(i);
  }
  long linkForEndTime = System.currentTimeMillis();
  System.out.println("用for循环linkList 10万次花费时间：" + (linkForEndTime - linkForStartTime) + "毫秒");
  
  //用froeach循环linkList
  long linkForeachStartTime = System.currentTimeMillis();
  for(Integer in : linkList){
   link = in;
  }
  long linkForeachEndTime = System.currentTimeMillis();
  System.out.println("用foreach循环linkList 10万次花费时间：" + (linkForeachEndTime - linkForeachStartTime ) + "毫秒");
 }
}