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                # Java - 獲取`HashMap`的大小 > 原文: [https://beginnersbook.com/2014/07/java-get-size-of-hashmap-example/](https://beginnersbook.com/2014/07/java-get-size-of-hashmap-example/) 在這個例子中,我們將看到如何使用[`HashMap`類](https://beginnersbook.com/2013/12/hashmap-in-java-with-example/)的`size()`方法獲取`HashMap`的大小。方法定義和描述如下: `public int size()`:返回此映射中鍵 - 值映射的數量。 ```java import java.util.HashMap; public class SizeExample { public static void main(String[] args) { // Creating a HashMap of int keys and String values HashMap<Integer, String> hashmap = new HashMap<Integer, String>(); // Adding Key and Value pairs to HashMap hashmap.put(11,"Value1"); hashmap.put(22,"Value2"); hashmap.put(33,"Value3"); hashmap.put(44,"Value4"); hashmap.put(55,"Value5"); // int size() method returns the number of key value pairs System.out.println("Size of HashMap : " + hashmap.size()); } } ``` **輸出:** ```java Size of HashMap : 5 ``` 由于我們在`HashMap`中有 5 個鍵值對,因此`size()`方法返回整數 5。另外,在上面的例子中我們采用了`Integer`鍵和`String`值,但是如果你想擁有`String`鍵和`String`值,那么你可以這樣改變泛型: `HashMap<String, String> hashmap = new HashMap<String, String>();` 請記住,如果您有字符串鍵和值,添加這樣的對。 `hashmap.put("11", "Value1");`
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