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

weakhashmap