hashset java_Java HashSet size（）方法与示例

红太狼 2023-03-05 12:49 6阅读 0赞

hashset java

## HashSet类的size()方法 **(**HashSet Class size() method**)** ##

*  **size() method** is available in java.util package.
    
    **size()方法**在java.util包中可用。
 *  **size() method** is used to return the size (i.e. the no. of elements exist) of this HashSet.
    
    **size()方法**用于返回此HashSet的大小(即，存在的元素数)。
 *  **size() 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.
    
    **size()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。
 *  **size() method** does not throw an exception at the time of returning size.
    
    返回size时， **size()方法**不会引发异常。

**Syntax:**

**句法：**

public int size();

**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 int, it returns the number of elements to be saved in this HashSet.

方法的返回类型为int ，它返回要保存在此HashSet中的元素数。

**Example:**

**例：**

// Java program to demonstrate the example 
    // of int size() method of HashSet 
    
    import java.util.*;
    
    public class SizeOfHashSet {
        
        public static void main(String[] args) {
        
            // Instantiates a HashSet object
            HashSet < String > hs = new HashSet < String > ();
    
            // By using add() method is to add
            // the given object of this
            // HashSet 
            hs.add("C");
            hs.add("C++");
            hs.add("JAVA");
            hs.add("PHP");
            hs.add("SFDC");
    
            // Display HashSet
            System.out.println("HashSet: " + hs);
    
            // By using size() method is to
            // return the size of this HashSet
            int size = hs.size();
    
            // Display size
            System.out.println("hs.size(): " + size);
        }
    }

**Output**

**输出量**

HashSet: [JAVA, C++, C, SFDC, PHP]
    hs.size(): 5

> 翻译自: [https://www.includehelp.com/java/hashset-size-method-with-example.aspx][https_www.includehelp.com_java_hashset-size-method-with-example.aspx]

hashset java

[https_www.includehelp.com_java_hashset-size-method-with-example.aspx]: https://www.includehelp.com/java/hashset-size-method-with-example.aspx