Java中的 SimpleDateFormat hashCode() 方法及示例

SimpleDateFormat 类的hashCode()方法用于返回此 SimpleDateFormat 对象的哈希码值。哈希码是整数类型。

句法：

public int hashCode()

参数：该方法不带任何参数。

返回值：该方法返回此 SimpleDateFormat 对象的哈希码值，为整数类型。

下面的程序说明了 SimpleDateFormat 的 hashCode() 方法的工作：

示例 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());
    }
}

输出：

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

示例 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());
    }
}

输出：

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