1 首先要看你的List是怎么生成的,比如:List<String> strList = Arrays.asList("a", "b", "aa", "ab", "ba");这种方式生成的List是不能改变的(fixed size),具体可以参见源码。2 比如下面这种方式生成的List是可以改变的:List<String> strList2 = new ArrayList<>();strList2.add("a");strLi...
The following Java program usesList.removeIf()to remove multiple elements from the arraylistin java by element value. ArrayList<String>namesList=newArrayList<String>(Arrays.asList("alex","brian","charles","alex"));System.out.println(namesList);namesList.removeIf(name->name.equals("alex"));Syst...
因为要求是返回修改后的长度并只考虑该长度的数组,那么就不用考虑该长度之后的数组,所以只需得到索引 j 的值,不用再把索引 j 的值改为索引 i的值。 Java: 代码语言:txt AI代码解释 class Solution { public int removeElement(int[] nums, int val) { int i=0,j=nums.length-1;//i-左指针;j-右指...
方法一:借助另外一个list,耗费空间 publicstaticintremoveElement(intnums[],intval){ List<Integer> list =newArrayList<Integer>(); //将数据暂时存放在list中for(inti = 0; i < nums.length; i++) {if(nums[i] !=val) list.add(nums[i]); }if(list.size() != 0){for(inti = 0; i < list...
2.1. Removing only the First Occurrence of the Element Java program to remove an object from an ArrayList usingremove()method. In the following example, we invoke theremove()method two times. If the element is found in the list, then the first occurrence of the item is removed from the ...
因此新的方法更适合容易出现异常条件的情况。 peek,element区别: element() 和 peek() 用于在队列的头部查询元素。与 remove() 方法类似,在队列为空时, element() 抛出一个异常,而 peek() 返回 null。
checkElementIndex(index); return node(index).item; } Node node(int index) { if (index < (size >> 1)) { Node x = first; for (int i = 0; i < index; i++) x = x.next; return x; } else { Node x = last; for (int i = size - 1; i > index; i--) ...
* 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 ...
Integer s = list.get(i); if ( s.equals(in) ) { list.remove(s); } } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 看上去我们的代码很完美,在理论上肯定会达到预期的结果,但是当遍历删除后的array,会发现,打印结果为2,2,1,3,3。怎么还有一个1没删除呢,现在我们来看在这段代码中用到...
但是新的 poll() 方法在用空集合调用时不是抛出异常,只是返回 null。因此新的方法更适合容易出现异常条件的情况。 peek,element区别: element() 和 peek() 用于在队列的头部查询元素。与 remove() 方法类似,在队列为空时, element() 抛出一个异常,而 peek() 返回 null...