weakhashmap_Java WeakHashMap get（）方法与示例

分手后的思念是犯贱 2023-03-05 13:29 90阅读 0赞

weakhashmap

## WeakHashMap类的get()方法 **(**WeakHashMap 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 to which the given key element (key\_ele) associated in this map otherwise it returns null.
    
    **get()方法**用于获取与此映射中关联的给定键元素(key\_ele)关联的值，否则返回null。
 *  **get() method** is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
    
    **get()方法**是一个非静态方法，只能通过类对象访问，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 element (key\_ele).
    
    返回给定键元素(key\_ele)的值时， **get()方法**不会引发异常。

**Syntax:**

**句法：**

public Object get(Object key_ele);

**Parameter(s):**

**参数：**

*  Object key\_ele – represents the key element (key\_ele) whose mapping is to be retrieved.
    
    对象key\_ele –表示要检索其映射的键元素(key\_ele)。

**Return value:**

**返回值：**

The return type of the method is Object, it returns key element (key\_ele) value when it exists otherwise it returns null.

该方法的返回类型为Object ，如果存在则返回键元素(key\_ele)的值，否则返回null。

**Example:**

**例：**

// Java program to demonstrate the example 
    // of Object get(Object key_ele) method of WeakHashMap 
    
    import java.util.*;
    
    public class GetOfWeakHashMap {
        
        public static void main(String[] args) {
        
            // Instantiates a WeakHashMap object
            Map < Integer, String > map = new WeakHashMap < Integer, String > ();
    
            // By using put() method is to add
            // key-value pairs in a WeakHashMap
            map.put(10, "C");
            map.put(20, "C++");
            map.put(50, "JAVA");
            map.put(40, "PHP");
            map.put(30, "SFDC");
    
            // Display WeakHashMap
            System.out.println("WeakHashMap: " + map);
    
            // By using get() method is to return
            // the value associated for the given
            // key element exists in this WeakHashMap
            Object val_ele = map.get(50);
    
            // Display val_ele
            System.out.print("map.get(50): ");
            System.out.println(val_ele);
        }
    }

**Output**

**输出量**

WeakHashMap: {30=SFDC, 40=PHP, 10=C, 20=C++, 50=JAVA}
    map.get(50): JAVA

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

weakhashmap

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