Java AbstractSequentialList的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成另一个元素。这可以通过在set()方法的参数中指定要替换的元素和新元素的位置来完成。

语法

AbstractSequentialList.set(int index, Object element)

参数： 该函数接受两个参数，如上面的语法所示，并描述如下。

• index : 这是一个整数类型的参数，指的是要被替换的元素在列表中的位置。
• element : 这是现有元素将被替换的新元素，与顺序列表的对象类型相同。

返回值： 该方法返回顺序列表中被新值替换的前一个值。

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

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<String>
            absqlist = new LinkedList<String>();
  
        // 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]

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<Integer>
            absqlist = new LinkedList<Integer>();
  
        // 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]