java vector

矢量类size()方法 (Vector Class size() method)

• size() method is available in java.util package.

  size()方法在java.util包中可用。

• size() method is used to return the size (i.e. the number of the element exists) of this Vector.

  size()方法用于返回此Vector的大小(即元素存在的数量)。

• size() 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.

  size()方法是一种非静态方法，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。

• size() method does not throw an exception at the time of returning size.

  返回size时， size()方法不会引发异常。

Syntax:

句法：

    public int size();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of the method is int, it returns the size of this vector.

方法的返回类型为int ，它返回此向量的大小。

Example:

例：

// Java program to demonstrate the example 
// of int size() method of Vector 
import java.util.*;
public class SizeOfVector {
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");
// By using size() methos is to return the 
// size i.e. the number of element exists
// Display Vector Size
System.out.println("v.size(): " + v.size());
}
}

Output

输出量

v.size(): 3

翻译自: https://www.includehelp.com/java/vector-size-method-with-example.aspx

java vector