java向數組中增加新元素

Given a list of the integers and we have to replace it an element from specified index with a new element in java.

給定一個整數列表，我們必須用Java中的新元素將其替換為指定索引中的一個元素。

To replace an element in the list - we use List.set() method.

要替換列表中的元素 -我們使用List.set()方法。

List.set()方法 (List.set() method)

List.set() method replaces an existing element at given index with new element and returns the old object/element.

List.set()方法將給定索引處的現有元素替換為新元素，并返回舊對象/元素。

Syntax:

句法：

Object List.set(index, new_object);

Example:

例：

Input:List = [10, 20, 30, 40, 50]Index =1 new_element = 1000Output:Updated list =[10, 1000, 30, 40, 50]

Program:

程序：

import java.util.*; public class ListExample {public static void main (String[] args) {//creating a list of integersList<Integer> int_list = new ArrayList<Integer> ();//adding some of the elements int_list.add (10) ;int_list.add (20) ;int_list.add (30) ;int_list.add (40) ;int_list.add (50) ;//replace elementsint old_ele, new_ele, index;index =0; new_ele=12;old_ele = int_list.set (index, new_ele);System.out.println (old_ele+" is replace with "+new_ele);index =2; new_ele=24;old_ele = int_list.set (index, new_ele);System.out.println (old_ele+" is replace with "+new_ele);//printing updated list System.out.println ("updated list: " + int_list);} };

Output

輸出量

10 is replace with 12 30 is replace with 24 updated list: [12, 20, 24, 40, 50] .minHeight{min-height: 250px;}@media (min-width: 1025px){.minHeight{min-height: 90px;}} .minHeight{min-height: 250px;}@media (min-width: 1025px){.minHeight{min-height: 90px;}}

另一個示例：將EVEN索引的所有元素替換為0，將ODD索引替換為1 (Another Example: Replace all elements of EVEN indexes with 0 and ODD indexes by 1 )

Example:

例：

Input:List = [10, 20, 30, 40, 50]Output:Updated list =[0, 1, 0, 1, 0]

Program:

程序：

import java.util.*; public class ListExample {public static void main (String[] args) {//creating a list of integersList<Integer> int_list = new ArrayList<Integer> ();//adding some of the elements int_list.add (10) ;int_list.add (20) ;int_list.add (30) ;int_list.add (40) ;int_list.add (50) ;System.out.println ("len: " + int_list.size ());//replace elements for (int i=0; i<int_list.size(); i++) {if (i%2==0)int_list.set (i, 0);elseint_list.set (i, 1); }//printing updated list System.out.println ("updated list: " + int_list);} };

Output

輸出量

len: 5 updated list: [0, 1, 0, 1, 0]

翻譯自: https://www.includehelp.com/java-programs/replace-an-element-at-given-index-of-a-list-with-new-element-in-java.aspx

java向數組中增加新元素

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