Java 中的抽象列表集()方法，示例
原文:https://www . geesforgeks . org/abstract list-set-method-in-Java-with-examples/
Java . util . AbstractList类的 set() 方法用于将使用 abstract list 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和新元素的位置来实现。
语法:
AbstractList.set(*int index, Object element*)
参数:该函数接受两个参数，如下所述:
- 索引:这是整数类型，指的是要从抽象列表中替换的元素的位置。
- 元素:是替换现有元素的新元素，与抽象列表的对象类型相同。
返回值:该方法返回抽象列表中被新值替换的前一个值。
下面的程序说明了 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);
}
}
Output:
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);
}
}
Output:
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]
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