Java 中的 SimpleDateFormat hashCode()方法,带示例

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

SimpleDateFormat 类hashCode() 方法用于返回这个 SimpleDateFormat 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:该方法返回这个 SimpleDateFormat 对象的哈希码值,并且是整数类型。

下面的程序说明了简单日期格式的 hashCode()方法的工作原理:

例 1:

// Java to illustrate hashCode() method

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

public class SimpleDateFormat_Demo {
    public static void main(String[] args)
        throws InterruptedException
    {
        // Initializing SimpleDateFormat
        SimpleDateFormat SDFormat
            = new SimpleDateFormat(
                "dd/MM/yyyy");

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

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

Output:

The Original: 30/01/2019
The hash code: -650712384

例 2:

// Java to illustrate hashCode() method

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

public class SimpleDateFormat_Demo {
    public static void main(String[] args)
        throws InterruptedException
    {
        // Initializing SimpleDateFormat
        SimpleDateFormat SDFormat
            = new SimpleDateFormat(
                "MM/dd/yyyy");

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

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

Output:

The Original: 01/30/2019
The hash code: 2087096576