ArrayList类trimToSize()方法 (ArrayList Class trimToSize() method)

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

  trimToSize()方法在java.util包中可用。

• trimToSize() method is used to trims the capacity according to its current size of this Arraylist.

  trimToSize()方法用于根据此Arraylist的当前大小来修剪容量。

• trimToSize() method is a non-static method so it is accessible with the class object and if we try to access the method with the class name then we will get an error.

  trimToSize()方法是非静态方法，因此可以通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• trimToSize() method does not throw an exception at the time of trimming the size of its Arraylist.

  trimToSize()方法在修剪其Arraylist的大小时不会引发异常。

Syntax:

句法：

public void trimToSize();

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 this method is void, it returns nothing.

此方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example // of void trimToSize() method of ArrayList.import java.util.*;public class TrimToSizeOfArrayList {
       public static void main(String[] args) {
           // Create an ArrayList with initial         // capacity of storing elements        ArrayList < String > arr_l = new ArrayList < String > (10);        // By using add() method is to add         // elements in this ArrayList        arr_l.add("C");        arr_l.add("C++");        arr_l.add("JAVA");        arr_l.add("DOTNET");        arr_l.add("PHP");        // By using trimToSize() method is to        // trim the size of this ArrayList        arr_l.trimToSize();        // Display after trimming        System.out.println("arr_l.trimToSize() : " + arr_l);    }}

Output

输出量

arr_l.trimToSize() : [C, C++, JAVA, DOTNET, PHP]

翻译自: