Java中的向量集（）方法

Java.util.Vector.set()方法用于将使用 Vector 类创建的向量中的任何特定元素替换为另一个元素。

句法：

Vector.set(int index, Object element)

参数：此函数接受两个强制性参数，如上述语法所示并在下文中描述。

• index ：这是整数类型，指的是要从向量中替换的元素的位置。
• element ：它将替换现有元素的新元素，并且与向量具有相同的对象类型。

返回值：该方法从向量中返回被新值替换的前一个值。

下面的程序说明了Java.util.Vector.set() 方法：

方案一：

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

输出：

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

方案二：

// Java code to illustrate set()
import java.util.*;
  
public class VectorDemo {
    public static void main(String args[])
    {
        // Creating an empty Vector
        Vector vec_tor = new Vector();
  
        // Use add() method to add elements in the vector
        vec_tor.add(12);
        vec_tor.add(23);
        vec_tor.add(22);
        vec_tor.add(10);
        vec_tor.add(20);
  
        // Displaying the Vector
        System.out.println("Vector: " + vec_tor);
  
        // Using set() method to replace 12 with 21
        System.out.println("The Object that is replaced is: "
                           + vec_tor.set(0, 21));
  
        // Using set() method to replace 20 with 50
        System.out.println("The Object that is replaced is: "
                           + vec_tor.set(4, 50));
  
        // Displaying the modified vector
        System.out.println("The new Vector is:" + vec_tor);
    }
}

输出：

Vector: [12, 23, 22, 10, 20]
The Object that is replaced is: 12
The Object that is replaced is: 20
The new Vector is:[21, 23, 22, 10, 50]