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