vector clear_Java Vector clear（）方法与示例

旧城等待， 2023-03-05 12:49 56阅读 0赞

vector clear

## 向量类clear()方法 **(**Vector 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 clear all of the existing objects in this Vector.
    
    **clear()方法**用于清除此Vector中的所有现有对象。
 *  **clear() 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.
    
    **clear()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。
 *  **clear() method** may throw an exception at the time of removing objects.
    
    **clear()方法**在删除对象时可能会引发异常。
    
    **UnsupportedOperationException**: This exception may throw when this method unsupported by the Collection.
    
    **UnsupportedOperationException** ：当Collection不支持此方法时，可能引发此异常。

**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 Vector 
    
    import java.util.Vector;
    
    public class CleartOfVector {
        
        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 
            System.out.println("v: " + v);
    
            // By using clear() method is to
            // remove all the existing elements
            // in this Vector
            v.clear();
    
            // Display Updated Vector
            System.out.println("v.clear(): " + v);
        }
    }

**Output**

**输出量**

v: [C, C++, JAVA]
    v.clear(): []

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

vector clear

[https_www.includehelp.com_java_vector-clear-method-with-example.aspx]: https://www.includehelp.com/java/vector-clear-method-with-example.aspx