Java中的 AbstractSequentialList set() 方法及示例

Java.util.AbstractSequentialList的set()方法用于将使用 LinkedList 类创建的顺序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。

句法：

AbstractSequentialList.set(int index, Object element)

参数：此函数接受两个参数，如上述语法所示，如下所述。

• index ：这是整数类型，指的是要从列表中替换的元素的位置。
• element ：它将替换现有元素的新元素，并且与顺序列表具有相同的对象类型。

返回值：该方法从顺序列表中返回被新值替换的前一个值。

下面的程序说明了Java.util.AbstractSequentialList.set() 方法：

示例 1：

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

输出：

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

示例 2：

// Java code to illustrate set()
  
import java.util.*;
import java.util.AbstractSequentialList;
  
public class AbstractSequentialListDemo {
    public static void main(String args[])
    {
  
        // Creating an empty AbstractSequentialList
        AbstractSequentialList
            absqlist = new LinkedList();
  
        // Use add() method to add elements in the list
        absqlist.add(50);
        absqlist.add(40);
        absqlist.add(30);
        absqlist.add(20);
        absqlist.add(10);
  
        // Displaying the AbstractSequentialList
        System.out.println("AbstractSequentialList:"
                           + absqlist);
  
        // Using set() method to replace 40 with 400
        System.out.println("The Object that is replaced is: "
                           + absqlist.set(1, 400));
  
        // Using set() method to replace 10 with 100
        System.out.println("The Object that is replaced is: "
                           + absqlist.set(4, 100));
  
        // Displaying the modified linkedlist
        System.out.println("The new List is:" + absqlist);
    }
}

输出：

AbstractSequentialList:[50, 40, 30, 20, 10]
The Object that is replaced is: 40
The Object that is replaced is: 10
The new List is:[50, 400, 30, 20, 100]