Java Dictionary size()用法及代碼示例

Java中的Dictionary類的size()方法用於了解字典的大小或字典中存在的不同鍵的數量。

用法:

DICTIONARY.size()

參數：
該方法不接受任何參數。

返回值：
該方法返回字典中存在的鍵數。

以下示例程序旨在說明size()詞典方法：
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()); 
    } 
}

輸出：

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()); 
    } 
}

輸出：

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

相關用法

注：本文由純淨天空篩選整理自Chinmoy Lenka大神的英文原創作品 Dictionary size() Method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。