Java 日历 hashCode()方法及示例

Calendar类中的 hashCode() 方法用于返回该日历对象的哈希代码。

语法：

public int hashCode()

参数： 该方法不接受任何参数。

返回值： 该方法返回该日历对象的哈希代码值。

以下程序说明了日历类的哈希代码()方法的工作情况：

例子1：

// Java code to illustrate
// hashCode() method
 
import java.util.*;
 
public class Calendar_Demo {
    public static void main(String args[])
    {
        // Creating a calendar object
        Calendar calndr = Calendar.getInstance();
 
        // Displaying the current calendar
        System.out.println("The time on"
                           + " Calendar shows: "
                           + calndr.getTime());
 
        // Getting the hash code
        int hash_code = calndr.hashCode();
        System.out.println("The hash code "
                           + "for this calendar is: "
                           + hash_code);
    }
}

输出

The time on Calendar shows: Wed Feb 20 15:55:22 UTC 2019
The hash code for this calendar is: 194416203

例2：

// Java code to illustrate
// hashCode() method
 
import java.util.*;
 
public class Calendar_Demo {
    public static void main(String args[])
    {
        // Creating a calendar
        Calendar calndr
            = new GregorianCalendar(2018, 6, 10);
 
        // Displaying the current calendar
        System.out.println("The time on"
                           + " Calendar shows: "
                           + calndr.getTime());
 
        // Getting the hash code
        int hash_code = calndr.hashCode();
        System.out.println("The hash code "
                           + "for this calendar is: "
                           + hash_code);
    }
}

输出

The time on Calendar shows: Tue Jul 10 00:00:00 UTC 2018
The hash code for this calendar is: -2123101761

参考资料: https://docs.oracle.com/javase/8/docs/api/java/util/Calendar.html#hashCode-