java enummap
EnumMap類的get()方法 (EnumMap 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 mapped with the given key element (key_ele) otherwise it returns null when no value associated with the given key element (key_ele).
get()方法用于獲取與給定鍵元素( key_ele )映射的值，否則，當沒有與給定鍵元素( key_ele )相關聯的值時，它返回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()方法是一個非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。
get() method does not throw an exception at the time of returning element mapped to the given key.
返回映射到給定鍵的元素時， get()方法不會引發異常。
Syntax:
句法：
public Value get(Object key_ele);
Parameter(s):
參數：
Object key_ele – represents the key element of this enum map.
object key_ele –表示此枚舉映射的關鍵元素。
Return value:
返回值：
The return type of this method is Value, it returns the mapped value of the given key element (key_ele) when exists else it returns null.
此方法的返回類型為Value ，如果存在則返回給定鍵元素( key_ele )的映射值，否則返回null。
Example:
例：
// Java program to demonstrate the example
// of Value get(Object key_ele) method of
// EnumMap
import java.util.*;
public class GetOfEnumMap {
public enum Colors {
RED,
BLUE,
PINK,
YELLOW
};
public static void main(String[] args) {
// We are creating EnumMap object
EnumMap < Colors, String > em =
new EnumMap < Colors, String > (Colors.class);
// By using put() method is to
// add the linked values in an
// EnumMap (em)
em.put(Colors.RED, "1");
em.put(Colors.BLUE, "2");
em.put(Colors.PINK, "3");
em.put(Colors.YELLOW, "4");
// Display EnumMap
System.out.println("EnumMap (em) :" + em);
// By using get(key_ele) method isto
// return the value of the given key
// element (key_ele) when exists otherwise
// it returns null
String val_ele = em.get(Colors.BLUE);
// Display val_ele of the given key
// element in an EnumMap
System.out.println("em.get(Colors.BLUE): " + val_ele);
}
}
Output
輸出量
EnumMap (em) :{RED=1, BLUE=2, PINK=3, YELLOW=4}
em.get(Colors.BLUE): 2
翻譯自: https://www.includehelp.com/java/enummap-get-method-with-example.aspx
java enummap
