Java 中的 Vector trimToSize()方法，示例
原文:https://www . geeksforgeeks . org/vector-trimtosize-method-in-Java-with-example/
Java 中的 trimToSize() 方法将向量实例的容量修剪为向量的当前大小。此方法用于将矢量实例修剪到其包含的元素数量。
*语法:*
trimToSize()
*参数:*不接受任何参数。
*返回值:*不返回值。它将此矢量实例的容量修剪为它包含的元素数量。
下面的程序说明了 trimTosize()方法:
*例 1:*
// Java code to demonstrate the working of
// trimTosize() method in Vector
import java.util.Vector;
public class GFG {
public static void main(String[] args)
{
// creating an Empty Integer Vector
Vector<Integer> vector
= new Vector<Integer>(9);
// using add(), add 5 values
vector.add(2);
vector.add(4);
vector.add(5);
vector.add(6);
vector.add(11);
// Displaying the Vector
System.out.println("Initial Vector is: " + vector);
// Displaying the Vector
System.out.println("Initial size is: " + vector.size());
// trims the size to the number of elements
vector.trimToSize();
// Displaying the Vector
System.out.println("Size after using trimToSize(): "
+ vector.size());
}
}
**Output:
Initial Vector is: [2, 4, 5, 6, 11]
Initial size is: 5
Size after using trimToSize(): 5
```**
****例 2:****
```java
// Java code to demonstrate the working of
// trimTosize() method in Vector
import java.util.Vector;
public class GFG {
public static void main(String[] args)
{
// creating vector type object
Vector<String> vector = new Vector<String>();
// Inserting elements into the table
vector.add("Geeks");
vector.add("4");
vector.add("Geeks");
vector.add("Welcomes");
vector.add("You");
// Displaying the Vector
System.out.println("Initial Vector is: " + vector);
// Displaying the Vector
System.out.println("Initial size is: " + vector.size());
// trims the size to the number of elements
vector.trimToSize();
// Displaying the Vector
System.out.println("Size after using trimToSize(): "
+ vector.size());
}
}
**Output:
```java Initial Vector is: [Geeks, 4, Geeks, Welcomes, You] Initial size is: 5 Size after using trimToSize(): 5
```**
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