1.ArrayList继承于AbstractList,AbstractList是抽象类,实现了List接口,它是一个数组队列,提供了相关的添加、删除、修改、遍历等基本功能实现,方法子类对方法复用,如果子类有特有功能可以重写父类的方法 ArrayList实现了List接口,List接口继承自Collection接口,在Collection接口提供的方法基础上,有一些新的方法提供,比如get、s...
• boolean removeAll(Collection<?> c):从此列表中删除包含在指定集合中的所有元素 • Object[] toArray():以正确的顺序(从第一个到最后一个元素)返回一个包含此列表中所有元素的数组 • int size():返回此列表中的元素数 • Iterator iterator():以正确的顺序返回该列表中元素的迭代器 • ListIterat...
Here, theaddAll()method does not contain the optionalindexparameter. Hence, all elements from the arraylistprimeNumbersare added at the end of the arraylistnumbers. Note: We have used theadd()method to add single elements to arraylist. To learn more, visitJava ArrayList add(). Example 2: I...
void ObjArrayKlass::copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS) { assert(s->is_objArray(), "must be obj array"); if (!d->is_objArray()) { THROW(vmSymbols::java_lang_ArrayStoreException()); } // Check is all offsets and lengths are non...
1. ArrayList addAll() Method TheaddAll()method first ensures that there is sufficient space in the list. If the list does not have space, then it grows the list by adding more spaces in the backing array. ThenaddAll()appends new elements to the end of the list or at the specified ...
booleanArrayList.addAll(index,collectionOfItems); 2. Examples of Adding elements at the Specified Index Let us take an example of adding an item at the index position1. ArrayList<String>namesList=newArrayList<>(Arrays.asList("alex","brian","charles"));namesList.add(1,"Lokesh");System.out...
IllegalArgumentException - 如果 elements 中值的某个属性不允许将它添加到 c 中 从以下版本开始: 1.5 另请参见: Collection.addAll(Collection) 文档写出如果第一个参数集合c如果不支持add操作仍然抛出UnsupportedOperationException,就比如刚刚用一个数组List<Integer> list = Arrays.asList(a);此时的list不允许add操...
Given an integer array of sizen, find all elements that appear more than⌊ n/3 ⌋times. The algorithm should run in linear time and in O(1) space. 之前也有类似得题,找出出现次数大于一般的元素,两道题一个想法。 publicclassSolution {publicList<Integer> majorityElement(int[] nums) { ...
void ObjArrayKlass::copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS) { assert(s->is_objArray(), "must be obj array"); if (!d->is_objArray()) { THROW(vmSymbols::java_lang_ArrayStoreException()); ...
通过Collections.addAll(arrayList, strArray)方式转换,根据数组的长度创建一个长度相同的List,然后通过Collections.addAll()方法,将数组中的元素转为二进制,然后添加到List中,这是最高效的方法。 关键代码:ArrayList< String> arrayList = new ArrayList<String>(strArray.length); Collections.addAll(arrayList, strAr...