Thelist.size()-1gives the index of an last element. Here is an example, that removes the last element4from thepricesArrayList: importjava.util.List;importjava.util.Arrays;importjava.util.ArrayList;publicclassMain{publicstaticvoidmain(String[]args){List<Integer>prices=newArrayList<>(Arrays.asList...
ArrayList<String>arraylist2=newArrayList<>();//1 - Remove an element from the specified index positionarraylist.remove(indexPosition);//2 - Remove the first occurence of element by its valuearraylist.remove(element);//3 - Remove all elements of the specified collection from arraylistarraylist.remo...
int length : 要copy的数组的长度 如果一个arraylist集合有0,1,2,3,4,5的数据 然后remove(3)从原数组的下标为4就是4开始,复制两个长度也就是4和5复制这两个, 接着 从目标数组开始(这里也是当前数组)的下标为3这里将其覆盖也就是变成0,1,2,4,5,5, 最后将最后一位置为null就变成0,1,2,4,5,null ...
element at index 5.myAL.RemoveAt(5);// Displays the current state of the ArrayList.Console.WriteLine("After removing the element at index 5:"); PrintValues( myAL );// Removes three elements starting at index 4.myAL.RemoveRange(4,3);// Displays the current state of the ArrayList....
}privateclassItrimplementsIterator<E> {intcursor;// index of next element to returnintlastRet=-1;// index of last element returned; -1 if no suchintexpectedModCount=modCount;//省略部分实现} Itr是ArrayList中的内部类,所以list.iterator()的作用是返回了一个Itr对象赋值到var2,后面调用var2.hasNext...
都说ArrayList在用foreach循环的时候,不能add元素,也不能remove元素,可能会抛异常,那我们就来分析一下它具体的实现。我目前的环境是java8。 有下面一段代码: public class TestForEachList extends BaseTests { @Test public void testForeach() {
Console.WriteLine( "The ArrayList initially contains the following:" ); PrintValues( myAL ); // Removes the element containing "lazy". myAL.Remove( "lazy" ); // Displays the current state of the ArrayList. Console.WriteLine( "After removing \"lazy\":" ); PrintValues( myAL ); // Re...
myAL.Remove( "lazy" ); // Displays the current state of the ArrayList. Console.WriteLine( "After removing \"lazy\":" ); PrintValues( myAL ); // Removes the element at index 5. myAL.RemoveAt( 5 ); // Displays the current state of the ArrayList. Console.WriteLine( "After removing...
int lastRet = -1; // index of last element returned; -1 if no such int expectedModCount = modCount; //省略部分实现 } Itr是ArrayList中的内部类,所以list.iterator()的作用是返回了一个Itr对象赋值到var2,后面调用...
Last but not least, we are traversing the set, which, in the worst scenario, will take O(N) time (if every element is unique) As a result, this method’s worst-case time complexity to remove duplicates from an array is O(N)+O(NlogN)+O(N)=O(NlogN). Auxiliary Space Analysis For...