ArrayList類set()方法 (ArrayList Class set() method)

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

  set()方法在java.util包中可用。

• set() method is used to replace the element at the given indices with the given ele(element) in this Arraylist.

  set()方法用于用此Arraylist中的給定ele(element)替換給定索引處的元素。

• set() 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.

  set()方法是一種非靜態方法，因此可以通過類對象進行訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• set() method may throw an exception at the time of replacing an element.

  set()方法在替換元素時可能會引發異常。

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

  IndexOutOfBoundsException ：如果給定索引不在范圍內，則可能引發此異常。

Syntax:

句法：

public T set (int indices, T ele);

Parameter(s):

參數：

• int indices – represents the indices of the given element to place.

  int index –表示要放置的給定元素的索引。

• T ele – represents the element to store at the given indices.

  T ele –表示要存儲在給定索引處的元素。

Return value:

返回值：

In the first case, the return type of the method is T, it returns the previous stored element at the given indices in this Arraylist.

在第一種情況下，方法的返回類型為T ，它將在此Arraylist中的給定索引處返回先前存儲的元素。

Example:

例：

// Java program to demonstrate the example // of T set(int, T) method of ArrayList.import java.util.*;public class SetOfArrayList {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 set(int, T) method is to return the// previous element stored at the given index // and replace the previous element with the given// element in this ArrayList.String element = arr_l.set(3, "Python");// Display Returned ElementSystem.out.println("arr_l.set(3,Python) : " + element);// Display ArrayListSystem.out.println("ArrayList Elements : " + arr_l);} }

Output

輸出量

ArrayList Elements :[C, C++, JAVA, DOTNET, PHP] arr_l.set(3,Python) : DOTNET ArrayList Elements : [C, C++, JAVA, Python, PHP]

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

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