Java Vector set()方法

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

语法

Vector.set(int index, Object element)

参数： 该函数接受两个强制性的参数，如上面的语法和下面的描述。

• index : 这是一个整数类型的参数，指的是要从矢量中替换的元素的位置。
• element : 这是一个新的元素，现有的元素将被替换，与矢量的对象类型相同。

返回值 ：该方法返回被新值替换的向量中的先前值。

以下程序说明了Java.util.Vector.set()方法。

程序1 :

// Java code to illustrate set()
import java.util.*;
  
public class VectorDemo {
    public static void main(String args[])
    {
        // Creating an empty Vector
        Vector<String> vec_tor = new Vector<String>();
  
        // 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]

程序2

// Java code to illustrate set()
import java.util.*;
  
public class VectorDemo {
    public static void main(String args[])
    {
        // Creating an empty Vector
        Vector<Integer> vec_tor = new Vector<Integer>();
  
        // 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]