如何在Java中将ArrayList转换为Array？

╰+攻爆jí腚メ 2023-03-05 13:27 34阅读 0赞

## 将ArrayList转换为Array **(**Converting ArrayList to Array**)** ##

Given an ArrayList and we have to convert it into an Array in Java.

给定一个ArrayList，我们必须将其转换为Java中的Array。

To convert an ArrayList to Array, we use **toArray() method**.

要将ArrayList转换为Array，我们使用**toArray()方法** 。

### toArray()方法 **(**toArray() method**)** ###

*  **toArray() method** is available in java.util package.
    
    **toArray()方法**在java.util包中可用。
 *  **toArray() method** is used to return a converted Array object which contains all of the elements in the ArrayList.
    
    **toArray()方法**用于返回转换后的Array对象，该对象包含ArrayList中的所有元素。
 *  **toArray() method** does not throw any exception at the time of conversion from ArrayList to Array.
    
    从ArrayList转换为Array时， **toArray()方法**不会引发任何异常。
 *  It's not a static method, it is accessible with class objects (i.e. If we try to execute with the class name then we will get an error).
    
    这不是静态方法，可以通过类对象进行访问(即，如果尝试使用类名执行，则会收到错误消息)。
 *  It's not a final method, it is overridable in child class if we want.
    
    这不是最终方法，如果需要，可以在子类中重写。

**Syntax:**

**句法：**

public Object[] toArray(){
        }

**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 Object\[\], it returns a converted ArrayList to an Array which contains all of the elements in the ArrayList.

此方法的返回类型为Object \[\] ，它将转换后的ArrayList返回到包含ArrayList中所有元素的Array。

**Example:**

**例：**

// Java program to demonstrate the example of
    // conversion of an ArrayList to an Array with 
    // the help of toArray() method of ArrayList
    
    import java.util.*;
    
    public class ArrayListToArray {
        
        public static void main(String[] args) {
        
            // ArrayList Declaration
            ArrayList arr_list = new ArrayList();
    
            // By using add() method to add few elements in 
            // ArrayList
    
            arr_list.add(10);
            arr_list.add(20);
            arr_list.add(30);
            arr_list.add(40);
            arr_list.add(50);
    
            // Display ArrayList
            System.out.println("ArrayList elements:");
            System.out.println(arr_list);
    
            System.out.println();
    
            // By using toArray() method is used to convert 
            // ArrayList to Array
    
            Object[] arr = arr_list.toArray();
    
            // Display Array
            System.out.println("Array elements: ");
    
            for (Object o: arr)
                System.out.println(o);
        }
    }

**Output**

**输出量**

ArrayList elements:
    [10, 20, 30, 40, 50]
    
    Array elements: 
    10
    20
    30
    40
    50

> 翻译自: [https://www.includehelp.com/java/convert-arraylist-to-array-in-java.aspx][https_www.includehelp.com_java_convert-arraylist-to-array-in-java.aspx]

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