Java DateFormat hashCode()方法及示例

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Java DateFormat hashCode()方法及示例

DateFormat类hashCode() 方法是用来返回这个DateFormat对象的哈希代码值。哈希代码是整数类型的。

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DateFormat对象的哈希代码值,为整数类型。

下面的程序说明了DateFormat的hashCode()方法的工作原理:
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());    }}

输出:

The Original: Mar 27, 2019 10:20:51 AMThe 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());    }}

输出:

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

参考资料: https://docs.oracle.com/javase/7/docs/api/java/text/DateFormat.html#hashCode()

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