Java EnumMap entrySet()
Java EnumMap类的
entrySet()方法用于创建EnumMap中包含的一组元素。此方法返回此EnumMap的设置视图。
语法
public Set<Map.Entry<K, V>> entrySet()
参数
NA
返回
此方法返回此对象包含的映射的集合视图枚举映射。
异常
NA
示例1
import java.util.*;
public class EnumMapEntrySetExample1 {
public enum Tutorial {
CSS, Python, PHP, Java, Javascript
};
public static void main(String[] args) {
EnumMap<Tutorial, String>map = new EnumMap<Tutorial, String>(Tutorial.class);
map.put(Tutorial.CSS, "1");
map.put(Tutorial.Python, "2");
map.put(Tutorial.PHP, "3");
map.put(Tutorial.Java, "4");
System.out.println("Map: "+map);
Set<Map.Entry<Tutorial, String>> set = map.entrySet();
System.out.println("Set: "+set);
}
}
输出:
Map: {CSS=1, Python=2, PHP=3, Java=4}
Set: [CSS=1, Python=2, PHP=3, Java=4]
示例2
import java.util.*;
public class EnumMapEntrySetExample2 {
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);
Set<
Map.Entry<
Days, String>
>
set = map.entrySet();
System.out.println("Set: "+set);
}
}
输出:
Map: {Monday=1, Tuesday=2, Wednesday=3, Thursday=4}
Set: [Monday=1, Tuesday=2, Wednesday=3, Thursday=4]
