java vector

向量类别sureCapacity()方法 (Vector Class ensureCapacity() method)

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

  sureCapacity()方法在java.util包中可用。

• ensureCapacity() method is used to ensure the capacity of this Vector when required or in other words, we can say this method is used to extend the capacity of this Vector when required.

  sureCapacity()方法用于在需要时确保此Vector的容量，换句话说，可以说此方法用于在需要时扩展此Vector的容量。

  The formula of New Capacity:

  新产能的公式：

  New Capacity = old capacity + minimum capacity (min_cap)

  新容量=旧容量+最小容量(min_cap)

• ensureCapacity() 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.

  guaranteeCapacity()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。

• ensureCapacity() method does not throw an exception at the time of ensuring capacity.

  确保容量时， ensureCapacity()方法不会引发异常。

Syntax:

句法：

    public void ensureCapacity(int min_cap);

Parameter(s):

参数：

• int min_cap – represents the required minimum capacity (min_cap).

  int min_cap –表示所需的最小容量(min_cap)。

Return value:

返回值：

The return type of the method is void, it returns nothing.

该方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example
// of void ensureCapacity(int min_cap) method
// of Vector
import java.util.*;
public class EnsureCapacityOfVector {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 Capacity
System.out.println("v.capacity(): " + v.capacity());
// By using ensureCapacity() method is to
// extend the capacity
v.ensureCapacity(20);
// Display Updated Capacity
System.out.println("v.ensureCapacity(20): " + v.capacity());
}
}

Output

输出量

v.capacity(): 10
v.ensureCapacity(20): 20

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

java vector