ArrayList<String>arraylist=newArrayList<>();arraylist.add("apple");// [apple]arraylist.add("banana");// [apple, banana]//Adding a new element at index position 1arraylist.add(1,"grapes");// [apple, grapes, banana]//Adding multiple elements element at index position 0arraylist.add(0,Arra...
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. ...
(); // arr 现在是 [1, 2, 3, 4, 5] // 使用 forEach 遍历数组 arr.forEach((element, index) => { console.log(`Element at index ${index} is ${element}`); }); // 使用 map 创建一个新数组 let newArr = arr.map(element => element * 2); // newArr 现在是 [2, 4, 6, ...
String element = arrayList.get(1); System.out.println("Element at index 1: " + element); } } ``` 在上述示例中,我们创建了一个`ArrayList`对象,并添加了三个元素。然后,使用`get(1)`方法获取索引为1的元素,即第二个元素。最后,将该元素打印输出。 注意:索引从0开始,所以`get(1)`返回的是第二...
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. Consol...
= -1) { System.out.println("Element 'apple' found at index: " + index); } else { System.out.println("Element 'apple' not found in the list"); } 复制代码 在上面的例子中,我们首先创建一个包含一些水果的ArrayList,然后使用indexOf方法查询"apple"元素在列表中的位置。如果元素存在,则打印出其...
public void add(int index, Object element) This method adds the element at the given index. Example 1:importjava.util.ArrayList; 2:publicclassAddMethodExample { 3:publicstaticvoidmain(String[] args) { 4:// ArrayList of String type
* * @param index index at which the specified element is to be inserted * @param element element to be inserted * @throws IndexOutOfBoundsException {@inheritDoc} */ public void add(int index, E element) { // 将指定的元素(element)插入此列表中的指定位置(index)。将index位置及后面的所有...
elementData[index]=element;returnoldValue; }privatevoidrangeCheck(intindex) {if(index >=size)thrownewIndexOutOfBoundsException(outOfBoundsMsg(index)); } 我们可以看到set方法就是将某个位置的元素换成传入的值,并将原来的值返回。 4.3 remove(int index)和remove(Object o)# ...
Eget(int index) Returns the element at the specified position in this list. intindexOf(Objecto) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element. ...