Java Dictionary get（）方法与示例

怼烎@ 2023-03-05 12:59 23阅读 0赞

## 字典类的get()方法 **(**Dictionary Class get() method**)** ##

*  **get() method** is available in java.util package.
    
    **get()方法**在java.util包中可用。
 *  **get() method** is used to get the value on the specified key element (key\_ele) in this dictionary.
    
    **get()方法**用于获取此字典中指定键元素(key\_ele)的值。
 *  **get() method** is a non-static method, it is accessible with the class object and if we try to access the method with the class name then we will get an error.
    
    **get()方法**是一种非静态方法，可通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
 *  **get() method** does not throw an exception at the time of returning the value of the given key.
    
    返回给定键的值时， **get()方法**不会引发异常。

**Syntax:**

**句法：**

public abstract Value get(Object key_ele);

**Parameter(s):**

**参数：**

*  Object key\_ele – represents key element (key\_ele) and sets null when key element does not have value.
    
    对象key\_ele –表示关键元素(key\_ele)，当关键元素没有值时将其设置为null。

**Return value:**

**返回值：**

The return type of this method is Value, it gets value on the given key element (key\_ele) in this dictionary.

此方法的返回类型为Value ，它获取此字典中给定键元素(key\_ele)的值。

**Example:**

**例：**

// Java program is to demonstrate the example
    // of get() method of Dictionary
    
    import java.util.*;
    
    public class GetOfDictionary {
        
        public static void main(String[] args) {
        
            // Instantiate a Hashtable object
            Dictionary dictionary = new Hashtable();
    
            // By using put() method is to
            // add an elements in Hashtable 
            dictionary.put(1, "C");
            dictionary.put(2, "C++");
            dictionary.put(3, "JAVA");
            dictionary.put(4, "PHP");
            dictionary.put(5, "SFDC");
    
            // Display Hashtable elements
            System.out.println("dictionary: " + dictionary);
    
            // By using get() method is to return
            // the value associated for the given
            // key element (key_ele) if exists
            Object val_ele = dictionary.get(3);
    
            // Display val_ele
            System.out.println("dictionary.get(3): " + val_ele);
        }
    }

**Output**

**输出量**

dictionary: {5=SFDC, 4=PHP, 3=JAVA, 2=C++, 1=C}
    dictionary.get(3): JAVA

> 翻译自: [https://www.includehelp.com/java/dictionary-get-method-with-example.aspx][https_www.includehelp.com_java_dictionary-get-method-with-example.aspx]

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