Java Vector equals()方法

Java中Vector类的java.util.vector .equals(Object obj)方法用于验证一个对象与一个向量的平等性，并对它们进行比较。只有当两个向量都包含相同的元素且顺序相同时，该列表才会返回真。

语法

first_vector.equals(second_vector)

参数： 该方法接受一个强制性参数second_vector，它指的是第二个向量与第一个向量的比较。

返回值： 如果相等成立，并且对象和向量都相等，该方法返回真，否则返回假。

以下程序用于说明java.util.Vector.elements()方法的工作。

程序1 :

// Java code to illustrate the equals() method
import java.util.*;
  
public class Vector_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty Vector
        Vector<String> vec_tor1 = new Vector<String>(5);
  
        // Inserting elements into the table
        vec_tor1.add("Geeks");
        vec_tor1.add("4");
        vec_tor1.add("Geeks");
        vec_tor1.add("Welcomes");
        vec_tor1.add("You");
  
        // Displaying the Vector
        System.out.println("The Vector is: "
                           + vec_tor1);
  
        // Creating an empty Vector
        Vector<String> vec_tor2 = new Vector<String>(5);
  
        // Inserting elements into the table
        vec_tor2.add("Geeks");
        vec_tor2.add("4");
        vec_tor2.add("Geeks");
        vec_tor2.add("Welcomes");
        vec_tor2.add("You");
  
        // Displaying the Vector
        System.out.println("The Vector is: "
                           + vec_tor2);
  
        System.out.println("Are both of them equal? "
                           + vec_tor1.equals(vec_tor2));
    }
}

输出：

The Vector is: [Geeks, 4, Geeks, Welcomes, You]
The Vector is: [Geeks, 4, Geeks, Welcomes, You]
Are both of them equal? true

程序2 :

// Java code to illustrate the equals() method
import java.util.*;
  
public class Vector_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty Vector
        Vector<Integer> vec_tor1 = new Vector<Integer>(5);
  
        // Inserting elements into the table
        vec_tor1.add(10);
        vec_tor1.add(15);
        vec_tor1.add(20);
        vec_tor1.add(25);
        vec_tor1.add(30);
  
        // Displaying the Vector
        System.out.println("The Vector is: " + vec_tor1);
  
        // Creating an empty Vector
        Vector<Integer> vec_tor2 = new Vector<Integer>(6);
  
        // Inserting elements into the table
        vec_tor2.add(10);
        vec_tor2.add(15);
        vec_tor2.add(20);
        vec_tor2.add(25);
        vec_tor2.add(30);
        vec_tor2.add(40);
  
        // Displaying the Vector
        System.out.println("The Vector is: " + vec_tor2);
  
        System.out.println("Are both of them equal? "
                           + vec_tor1.equals(vec_tor2));
    }
}

输出：

The Vector is: [10, 15, 20, 25, 30]
The Vector is: [10, 15, 20, 25, 30, 40]
Are both of them equal? false