Java Dictionary size()用法及代码示例

Java中的Dictionary类的size()方法用于了解字典的大小或字典中存在的不同键的数量。

用法:

DICTIONARY.size()

参数：
该方法不接受任何参数。

返回值：
该方法返回字典中存在的键数。

以下示例程序旨在说明size()词典方法：
示例1:

// Java Code to illustrate size() 
import java.util.*; 
  
public class Dictionary_Demo { 
    public static void main(String args[]) 
    { 
  
        // Creating a dictionary of Hashtable 
        Dictionary<Integer, String> dict 
            = new Hashtable<Integer, String>(); 
  
        // Inserting elements into the Dictionary 
        dict.put(10, "Geeks"); 
        dict.put(15, "4"); 
        dict.put(10, "Geeks"); 
        dict.put(25, "Welcomes"); 
        dict.put(30, "You"); 
  
        // Displaying the Dictionary 
        System.out.println("Dictionary: " + dict); 
  
        // Displaying the size of the dictionary 
        System.out.println("The size of the dictionary is "
                           + dict.size()); 
    } 
}

输出：

Dictionary: {10=Geeks, 30=You, 15=4, 25=Welcomes}
The size of the dictionary is 4

示例2:

// Java Code to illustrate size() 
import java.util.*; 
  
public class Dictionary_Demo { 
    public static void main(String args[]) 
    { 
  
        // Creating a dictionary of Hashtable 
        Dictionary<String, Integer> dict 
            = new Hashtable<String, Integer>(); 
  
        // Inserting elements into the table 
        dict.put("Geek", 10); 
        dict.put("4", 15); 
        dict.put("Geeks", 20); 
        dict.put("Welcomes", 25); 
        dict.put("You", 30); 
  
        // Displaying the Dictionary 
        System.out.println("Dictionary: " + dict); 
  
        // Displaying the size of the dictionary 
        System.out.println("The size of the dictionary is "
                           + dict.size()); 
    } 
}

输出：

Dictionary: {You=30, Welcomes=25, 4=15, Geeks=20, Geek=10}
The size of the dictionary is 5

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注：本文由纯净天空筛选整理自Chinmoy Lenka大神的英文原创作品 Dictionary size() Method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。