Java ArrayList clear（）方法及示例

刺骨的言语ヽ痛彻心扉 2023-03-05 13:28 15阅读 0赞

## ArrayList类clear()方法 **(**ArrayList Class clear() method**)** ##

*  **clear() method** is available in java.util package.
    
    **clear()方法**在java.util包中可用。
 *  **clear() method** is used to delete or clear all the elements from this Arraylist.
    
    **clear()方法**用于删除或清除此Arraylist中的所有元素。
 *  **clear() 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.
    
    **clear()方法**是一种非静态方法，因此可以通过类对象进行访问，如果尝试使用类名称访问该方法，则会收到错误消息。
 *  **clear() method** does not throw an exception at the time of clearing Arraylist.
    
    **clear()方法**在清除Arraylist时不会引发异常。

**Syntax:**

**句法：**

public void clear();

**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 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 clear() method of ArrayList.
    
    import java.util.*;
    
    public class ClearOfArrayList {
        
        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");
            arr_l.add("JAVA");
    
            // Display ArrayList 
            System.out.println("ArrayList Elements :" + arr_l);
    
            // By using clear() method is to
            // remove all the elements from the ArrayList
            arr_l.clear();
    
            // Display ArrayList 
            System.out.println("arr_l.clear() : " + arr_l);
        }
    }

**Output**

**输出量**

ArrayList Elements :[C, C++, JAVA, DOTNET, PHP, JAVA]
    arr_l.clear() : []

> 翻译自: [https://www.includehelp.com/java/arraylist-clear-method-with-example.aspx][https_www.includehelp.com_java_arraylist-clear-method-with-example.aspx]

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