java enummap

EnumMap类containsValue()方法 (EnumMap Class containsValue() method)

• containsValue() method is available in java.util package.

  containsValue()方法在java.util包中可用。

• containsValue() method is used to check whether the given value element (val_ele) maps one or more than one key associated or not of this enum map.

  containsValue()方法用于检查给定值元素( val_ele )是否映射一个或多个与该枚举映射关联的键。

• containsValue() 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.

  containsValue()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。

• containsValue() method does not throw an exception at the time of checking value mappings.

  containsValue()方法在检查值映射时不会引发异常。

Syntax:

句法：

    public boolean containsValue(Object val_ele);

Parameter(s):

参数：

• Object val_ele – represents the value element (val_ele) whose presence is to be checked.

  对象val_ele –表示要检查其值的值元素(val_ele)。

Return value:

返回值：

The return type of this method is boolean, it returns true when this enum map have one or more keys for the given value element (val_ele) otherwise it returns false.

此方法的返回类型为boolean ，当此枚举映射具有给定值元素(val_ele)的一个或多个键时，它返回true，否则返回false。

Example:

例：

// Java program to demonstrate the example 
// of boolean containsValue(Object val_ele) method 
// of EnumMap
import java.util.*;
public class ContainsValueOfEnumMap {
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.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);
// By using containsValue() method isto
// check whether this EnumMap contains
// atleast one key element associated for the
// given value element or not in an EnumMap
boolean status = em.containsValue("3");
// Display status of EnumMap
System.out.println("em.containsValue(3): " + status);
}
}

Output

输出量

EnumMap :{RED=1, BLUE=2, PINK=3, YELLOW=4}
em.containsValue(3): true

翻译自: https://www.includehelp.com/java/enummap-containsvalue-method-with-example.aspx

java enummap