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                # Java - 檢查`HashMap`中是否存在特定值 > 原文: [https://beginnersbook.com/2014/07/java-check-if-a-particular-value-exists-in-hashmap-example/](https://beginnersbook.com/2014/07/java-check-if-a-particular-value-exists-in-hashmap-example/) 在這個例子中,我們檢查`HashMap`中是否存在特定值。我們將使用[`HashMap`類](https://beginnersbook.com/2013/12/hashmap-in-java-with-example/)的[`containsValue()`](https://docs.oracle.com/javase/7/docs/api/java/util/HashMap.html#containsValue(java.lang.Object))方法來執行此檢查: `public boolean containsValue(Object value)`:如果此映射將一個或多個鍵映射到指定值,則返回`true`。 **完整代碼:** 這里我們有一個整數鍵和字符串值的`HashMap`,我們正在檢查特定的`String`是否映射到`HashMap`的任何鍵。 ```java import java.util.HashMap; public class CheckValueExample { 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,"Chaitanya"); hashmap.put(22,"Pratap"); hashmap.put(33,"Singh"); hashmap.put(44,"Rajesh"); hashmap.put(55,"Kate"); // Checking Value Existence boolean flag = hashmap.containsValue("Singh"); System.out.println("String Singh exists in HashMap? : " + flag); } } ``` **輸出:** ```java String Singh exists in HashMap? : true ```
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