Java 中的 DateFormat hashCode()方法,带示例

原文:https://www . geesforgeks . org/dateform-hashcode-method-in-Java-with-examples/

日期格式类hashCode() 方法用于返回该日期格式对象的哈希码值。哈希代码是整数类型。

语法:

public int hashCode()

参数:该方法不取任何参数。

返回值:该方法返回该 DateFormat 对象的哈希码值,并且是整数类型。

以下程序说明了 hashCode()方法的工作日期格式: 示例 1:

// Java to illustrate hashCode() method

import java.text.*;
import java.util.*;

public class DateFormat_Demo {
    public static void main(String[] args)
    {
        // Initializing DateFormat
        DateFormat DFormat
            = DateFormat.getDateTimeInstance();

        // Displaying the formats
        Date date = new Date();
        String str_Date1 = DFormat.format(date);
        System.out.println("The Original: "
                           + (str_Date1));

        // Displaying the hash code
        System.out.println("The hash code: "
                           + DFormat.hashCode());
    }
}

Output:

The Original: Mar 27, 2019 10:20:51 AM
The hash code: 2034585966

例 2:

// Java to illustrate hashCode() method

import java.text.*;
import java.util.*;

public class DateFormat_Demo {
    public static void main(String[] args)
    {
        // Initializing DateFormat
        DateFormat DFormat
            = new SimpleDateFormat("MM/dd/yyyy");

        // Displaying the formats
        Date date = new Date();
        String str_Date1 = DFormat.format(date);
        System.out.println("The Original: "
                           + (str_Date1));

        // Displaying the hash code
        System.out.println("The hash code: "
                           + DFormat.hashCode());
    }
}

Output:

The Original: 03/27/2019
The hash code: 2087096576

参考:https://docs . Oracle . com/javase/7/docs/API/Java/text/dateformat . html # hashCode()