[英]Why does ArrayList takes more time to insert element in the beginning than LinkedList in java
[英]Measure time taken by insert operation on the ArrayList and LinkedList
我想在中创建方法以查看创建 10000 个ArrayList
和LinkedList
需要多少时间。 我在找什么?
public class Solution
{
public static void main(String[] args)
{
System.out.println(getTimeMsOfInsert(new ArrayList()));
System.out.println(getTimeMsOfInsert(new LinkedList()));
}
public static long getTimeMsOfInsert(List list)
{
insert10000(list);
}
public static void insert10000(List list)
{
for (int i=0;i<10000;i++)
{
list.add(0, new Object());
}
}
}
你的代码有一个compilation errors
,所以我修复了它们并添加了一些代码可能对你有帮助。
所以你可以这样做:
public class Solution{
public static void main(String[] args) {
System.out.println(getTimeMsOfInsert(new ArrayList()));
System.out.println(getTimeMsOfInsert(new LinkedList()));
}
public static long getTimeMsOfInsert(List list) {
return getInsertTime(list);
}
public static long getInsertTime(List list) {
long start = System.currentTimeMillis();
for (int i = 0; i < 10000; i++) {
list.add(new Object());
}
return System.currentTimeMillis() - start;
}
}
来自 codegym 社区的您好:) 以下是我的解决方案。 您可以轻松使用 System.currentTimeMillis()
public static long getInsertTimeInMs(List list) {
// write your code here
long start = System.currentTimeMillis();
insert10000(list);
// write your code here
long finish = System.currentTimeMillis();
return finish - start;
}
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