ArrayList類(lèi)的get()方法 (ArrayList Class get() method)

• get() method is available in java.util package.

  get()方法在java.util包中可用。

• get() method is used to retrieve the element at the given index in this Arraylist.

  get()方法用于檢索此Arraylist中給定索引處的元素。

• get() method is a non-static method so it is accessible with the class object and if we try to access the method with the class name then we will get an error.

  get()方法是一種非靜態(tài)方法，因此可以通過(guò)類(lèi)對(duì)象進(jìn)行訪問(wèn)，如果嘗試使用類(lèi)名稱(chēng)訪問(wèn)該方法，則會(huì)收到錯(cuò)誤消息。

• get() method may throw an exception at the time of returning an element of the given indices.

  在返回給定索引的元素時(shí)， get()方法可能會(huì)引發(fā)異常。

  IndexOutOfBoundsException:- This exception may throw when the given indices are not in a range.

  IndexOutOfBoundsException：-當(dāng)給定索引不在范圍內(nèi)時(shí)，可能引發(fā)此異常。

Syntax:

句法：

public T get(int indices);

Parameter(s):

參數(shù)：

• int indices – represents the index of the element to retrieve.

  int index –表示要檢索的元素的索引。

Return value:

返回值：

The return type of this method is T, it returns the element at the given index in this Arraylist.

此方法的返回類(lèi)型為T(mén) ，它返回此Arraylist中給定索引處的元素。

Example:

例：

// Java program to demonstrate the example // of T get(int) method of ArrayList.import java.util.*;public class GetOfArrayList {public static void main(String[] args) {// Create an ArrayList with initial // capacity of storing elementsArrayList < String > arr_l = new ArrayList < String > (10);// By using add() method is to add // elements in this ArrayListarr_l.add("C");arr_l.add("C++");arr_l.add("JAVA");arr_l.add("DOTNET");arr_l.add("PHP");// Display ArrayListSystem.out.println("ArrayList Elements :" + arr_l);// By using get(int) method is to return the// element at the given index in this ArrayListString element = arr_l.get(2);// Display Returned ElementSystem.out.println("arr_l.get(2) : " + element);} }

Output

輸出量

ArrayList Elements :[C, C++, JAVA, DOTNET, PHP] arr_l.get(2) : JAVA

翻譯自: https://www.includehelp.com/java/arraylist-get-method-with-example.aspx

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