Java UUID hashCode()方法及实例

Java中UUID类的hashCode()方法通常用于获取UUID的哈希代码值。

语法

public int hashCode()

参数： 该方法不接受任何参数。

返回值： 该方法返回一个整数值，即该UUID实例的hashCode值。

下面的程序说明了hashCode()方法的工作原理。

程序1 :

// 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-11d8-9669-0800200c9a66The hashCode value is: 3744873

程序2

// 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-b8c6-83e29cd24f4cThe hashCode value is: -1447957042