elementat_Java Vector elementAt（）方法与示例

刺骨的言语ヽ痛彻心扉 2023-03-05 15:53 25阅读 0赞

elementat

## 向量类的elementAt()方法 **(**Vector Class elementAt() method**)** ##

*  **elementAt() method** is available in java.util package.
    
    **elementAt()方法**在java.util包中可用。
 *  **elementAt() method** is used to return the element at the given indices of this Vector.
    
    **elementAt()方法**用于返回此Vector的给定索引处的元素。
 *  **elementAt() method** is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
    
    **elementAt()方法**是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
 *  **elementAt() method** may throw an exception at the time of returning the element.
    
    返回元素时， **elementAt()方法**可能会引发异常。
    
    **ArrayIndexOutOfBoundsException**: This exception may throw when the given index is less than 0 or greater than the current size.
    
    **ArrayIndexOutOfBoundsException** ：当给定索引小于0或大于当前大小时，可能引发此异常。

**Syntax:**

**句法：**

public Object elementAt(int index);

**Parameter(s):**

**参数：**

*  int index – represents the position of the returned element.
    
    int index –表示返回元素的位置。

**Return value:**

**返回值：**

The return type of the method is Object, it returns the object of the given index.

该方法的返回类型为Object ，它返回给定索引的对象。

**Example:**

**例：**

// Java program to demonstrate the example 
    // of Object elementAt(int indices) method 
    // of Vector 
    
    import java.util.*;
    
    public class ElementAtOfVector {
        
        public static void main(String[] args) {
        
            // Instantiates a Vector object  with
            // initial capacity of "10"
            Vector < String > v = new Vector < String > (10);
    
            // By using add() method is to add the
            // elements in this v
            v.add("C");
            v.add("C++");
            v.add("JAVA");
    
            // Display Vector
            System.out.println("v: " + v);
    
            // By using elementAt(1) method is to
            // return the element at the given indices
            // "1"
            Object ele = v.elementAt(1);
    
            // Display returned element at the
            // given indices
            System.out.println("v.elementAt(1): " + ele);
        }
    }

**Output**

**输出量**

v: [C, C++, JAVA]
    v.elementAt(1): C++

> 翻译自: [https://www.includehelp.com/java/vector-elementat-method-with-example.aspx][https_www.includehelp.com_java_vector-elementat-method-with-example.aspx]

elementat

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