Java AbstractList set()用法及代码示例

java.util.AbstractList 类的 set() 方法用于将使用 AbstractList 类创建的抽象列表中的任何特定元素替换为另一个元素。这可以通过在 set() 方法的参数中指定要替换的元素的位置和新元素来完成。

用法:

AbstractList.set(int index, Object element)

参数：该函数接受两个参数，如下所述：

index：这是整数类型，指的是要从抽象列表中替换的元素的位置。
element：它是现有元素将被替换的新元素，并且与抽象列表具有相同的对象类型。

返回值：该方法从抽象列表中返回被新值替换的先前值。

以下示例程序旨在说明 AbstractList.set() 方法：


// Java code to illustrate set()
  
import java.util.*;
import java.util.LinkedList;
  
public class AbstractListDemo {
    public static void main(String args[])
    {
  
        // Creating an empty AbstractList
        AbstractList<String> list = new LinkedList<String>();
  
        // Use add() method to add elements in the list
        list.add("Geeks");
        list.add("for");
        list.add("Geeks");
        list.add("10");
        list.add("20");
  
        // Displaying the AbstractList
        System.out.println("AbstractList:" + list);
  
        // Using set() method to replace Geeks with GFG
        System.out.println("The Object that is replaced is:"
                           + list.set(2, "GFG"));
  
        // Using set() method to replace 20 with 50
        System.out.println("The Object that is replaced is:"
                           + list.set(4, "50"));
  
        // Displaying the modified AbstractList
        System.out.println("The new AbstractList is:" + list);
    }
}

输出：

AbstractList:[Geeks, for, Geeks, 10, 20]
The Object that is replaced is:Geeks
The Object that is replaced is:20
The new AbstractList is:[Geeks, for, GFG, 10, 50]

程序2:


// Java code to illustrate set()
  
import java.util.*;
  
public class LinkedListDemo {
    public static void main(String args[])
    {
  
        // Creating an empty AbstractList
        AbstractList<Integer>
            list = new LinkedList<Integer>();
  
        // Use add() method to add elements in the list
        list.add(10);
        list.add(20);
        list.add(30);
        list.add(40);
        list.add(50);
  
        // Displaying the AbstractList
        System.out.println("AbstractList:" + list);
  
        // Using set() method to replace 10 with 100
        System.out.println("The Object that is replaced is:"
                           + list.set(0, 100));
  
        // Using set() method to replace 20 with 200
        System.out.println("The Object that is replaced is:"
                           + list.set(1, 200));
  
        // Displaying the modified AbstractList
        System.out.println("The new AbstractList is:" + list);
    }
}

输出：

AbstractList:[10, 20, 30, 40, 50]
The Object that is replaced is:10
The Object that is replaced is:20
The new AbstractList is:[100, 200, 30, 40, 50]

相关用法

注：本文由纯净天空筛选整理自Chinmoy Lenka大神的英文原创作品 AbstractList set() Method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。