Java 中的向量集()方法

原文:https://www.geeksforgeeks.org/vector-set-method-in-java/

T1。set() 方法用于用另一个元素替换使用 vector 类创建的向量中的任何特定元素。

语法:

Vector.set(int index, Object element)

参数:该函数接受两个强制参数，如上语法所示，如下所述。

  • 索引:这是整型的，指的是向量中要替换的元素的位置。
  • 元素:是替换现有元素的新元素，与矢量属于同一对象类型。

返回值:该方法返回向量中被新值替换的前一个值。

下面的程序说明了 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);
    }
}

Output:

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);
    }
}

Output:

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]

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