java删除指定索引元素
We have to create a List and add objects/elements to the List and given indexes in java.
我们必须创建一个List并将对象/元素添加到该List中，并在Java中添加给定的索引。
To add any object/element at given index to the List, we use, List.add() method - which is a method of List and used to inserts object/element at given index.
要将给定索引处的任何对象/元素添加到List，我们使用List.add()方法-这是List的一种方法，用于在给定索引处插入对象/元素。
Syntax:
句法：
List.add(index, element);
Here,
这里，
index is the position of the list, where we have to insert the element
index是列表的位置，我们必须在其中插入元素
element is the value or any object that is to be added at given index
element是要在给定索引处添加的值或任何对象
Example:
例：
L.add(0,10); //adds 10 at 0th index
L.add(1,20); //adds 20 at 1st index
L.add(3,30); //adds 30 at 2nd index
Program:
程序：
Here, we are creating a list of integer named int_list with some of the initial elements and we will add some of the elements at given indexes.
在这里，我们将创建一个名为int_list的整数列表， 其中包含一些初始元素，并将在给定索引处添加一些元素。
import java.util.*;
public class ListExample {
public static void main (String[] args) {
//creating a list of integers
List<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);
//printing the empty List
System.out.print ("int_list= ");
System.out.println (int_list);
//adding elements by specifying index
int_list.add (0, 5); //will add 5 at 0th index
int_list.add (3, 7); //will add 7 at 3rd index
//printing thed list
System.out.print ("int_list= ");
System.out.print (int_list);
}
};
Output
输出量
int_list= [10, 20, 30, 40, 50]
int_list= [5, 10, 20, 7, 30, 40, 50]
翻译自: https://www.includehelp.com/java-programs/add-object-element-to-the-list-at-specified-index-in-java.aspx
java删除指定索引元素
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