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(ele
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 ...
checkForComodification();//问题出在这行代码,然后看这个方法是什么?inti=cursor;if(i >= size)thrownewNoSuchElementException(); Object[] elementData = ArrayList.this.elementData;if(i >= elementData.length)thrownewConcurrentModificationException(); cursor = i +1;return(E) elementData[lastRet = i];...
Object remove(int index)– removes the element at the specified position in this list. Shifts any subsequent elements to the left. Returns the removed element from the list. ThrowsIndexOutOfBoundsExceptionif the argument index is invalid. 2. Examples to remove an element from ArrayList 2.1. Re...
我们经常会使用ArrayList的remove方法删除元素,看起来是很简单的调用,但是真的是机关重重。 1. 删除jdk中的类对象 我们先来创建一个ArrayList数组列表 ArrayList<Integer> array = new ArrayList<>(); array.add(2); array.add(2); array.add(1);
首先看一下ArrayList.remove(int index)的源码,读代码前先看方法注释:移除列表指定位置的一个元素,将该元素后面的元素们往左移动一位。返回被移除的元素。 源代码也比较好理解,ArrayList底层是数组,size是数组长度大小,index是数组索引坐标,modCount是被修改次数的计数器,oldValue就是被移除索引的元素对象,numMoved是...
("dog");// Displays the ArrayList.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\":"); Print...
* Removes the element at the specified position in this list. * Shifts any subsequent elements to the left (subtracts one from their * indices). * * @param index the index of the element to be removed * @return the element that was removed from the list ...
The deletion of an element in the ArrayList is straight forward. It requires one simple call to an inbuilt function. package com.journaldev.java; import java.util.ArrayList; import java.util.Arrays; public class Main { public static void main(String[] args) { int[] arr = new int[]{1,...
Remove Element 问题:删除数组中和elem相等的元素,并且返回新数组大小。英语不好。。。读错题了。。 class Solution { public: int remo... 2K80 微课系列(一):Python列表remove()方法工作原理 2)remove()方法删除列表中指定值的首次出现,也就是说,以lst.remove(3)为例,如果列表lst中有多个3,那么只有第一个...