Java中的 UUID hashCode() 方法及示例

Java中UUID类的hashCode()方法一般用于获取UUID的哈希码值。

句法：

public int hashCode()

参数：此方法不带任何参数。

返回值：此方法返回一个整数值，该值是此 UUID 实例的 hashCode 值。

下面的程序说明了 hashCode() 方法的工作：

方案一：

// Java code to illustrate hashCode() method
  
import java.util.*;
  
public class UUID_Demo {
    public static void main(String[] args)
    {
  
        // Creating two UUIDs
        UUID UUID_1
            = UUID
                  .fromString(
                      "58e0a7d7-eebc-11d8-9669-0800200c9a66");
  
        // Displaying the UUID
        System.out.println("UUID: "
                           + UUID_1);
  
        // Displaying the hashCode value
        System.out.println("The hashCode value is: "
                           + UUID_1.hashCode());
    }
}

输出：

UUID: 58e0a7d7-eebc-11d8-9669-0800200c9a66
The hashCode value is: 3744873

方案二：

// Java code to illustrate hashCode() method
  
import java.util.*;
  
public class UUID_Demo {
    public static void main(String[] args)
    {
  
        // Creating two UUIDs
        UUID UUID_1
            = UUID
                  .fromString(
                      "5fc03087-d265-11e7-b8c6-83e29cd24f4c");
  
        // Displaying the UUID
        System.out.println("UUID: "
                           + UUID_1);
  
        // Displaying the hashCode Value
        System.out.println("The hashCode value is: "
                           + UUID_1.hashCode());
    }
}

输出：

UUID: 5fc03087-d265-11e7-b8c6-83e29cd24f4c
The hashCode value is: -1447957042