Java EnumMap containsValue()
Java EnumMap类的
containsValue()方法用于检查一个或多个键是否与一个键相关联。是否给定值。如果指定值由映射中的任何键映射，则此方法返回true。
语法
public boolean containsValue(Object value)
参数
value-要在此映射中进行测试的值
返回
如果此映射将一个或多个键映射到该值，则此方法返回true。
异常
NA
示例1
import java.util.EnumMap;
public class EnumMapContainsValueExample1 {
public enum Tutorial {
Java, Python, PHP, Android, AngularJS
};
public static void main(String[] args) {
EnumMap<Tutorial, String>map = new EnumMap<Tutorial, String>(Tutorial.class);
map.put(Tutorial.Java, "1");
map.put(Tutorial.Python, "2");
map.put(Tutorial.PHP, "3");
map.put(Tutorial.Android, "4");
map.put(Tutorial.AngularJS, "5");
System.out.println("Map: "+map);
boolean contains = map.containsValue("1");
System.out.println("Map contains '1': "+contains);
contains = map.containsValue("5");
System.out.println("Map contains '5': "+contains);
}
}
输出:
Map: {Java=1, Python=2, PHP=3, Android=4, AngularJS=5}
Map contains '1': true
Map contains '5': true
示例2
import java.util.EnumMap;
public class EnumMapContainsValueExample2 {
// create an enum
public enum Days {
Monday, Tuesday, Wednesday, Thursday
};
public static void main(String[] args) {
EnumMap<Days, String>map = new EnumMap<Days, String>(Days.class);
map.put(Days.Monday,"1");
map.put(Days.Tuesday,"2");
map.put(Days.Wednesday,"3");
map.put(Days.Thursday,"4");
System.out.println("Map: "+map);
boolean contains = map.containsValue("2");
System.out.println("Map contains '2': "+contains);
contains = map.containsValue("4");
System.out.println("Map contains '4': "+contains);
}
}
输出:
Map: {Monday=1, Tuesday=2, Wednesday=3, Thursday=4}
Map contains '2': true
Map contains '4': true
