Java EnumMap hashCode()
Java EnumMap类的
hashCode()方法用于获取EnumMap的哈希码值。返回一个整数，其值是映射中每个条目的哈希码之和。
语法
参数
NA
返回
此方法返回此映射的哈希码值。
异常
NA
示例1
import java.util.*;
public class EnumMapHashCodeExample1 {
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("Hash code value of the map: "+map.hashCode());
map.clear();
System.out.println("Hash code value after clearing the map: "+map.hashCode());
}
}
输出:
Hash code value of the map: -450357866
Hash code value after clearing the map: 0
示例2
import java.util.*;
public class EnumMapHashCodeExample2 {
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");
System.out.println("Hash code value of the map: "+map.hashCode());
map.clear();
System.out.println("Hash code value after clearing the map: "+map.hashCode());
}
}
输出:
Hash code value of the map: -1315471824
Hash code value after clearing the map: 0
