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...
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];...
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 ...
ArrayList remove() removes the first occurrence of the specified element from this list, if it is present, else the list remains unchanged.
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);
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...
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 ...
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...