Java UUID fromString()方法及示例

Java中 UUID类 的 fromString() 方法用于从标准的字符串表示中创建UUID。

语法

public static UUID fromString(String UUID_name)

参数： 该方法需要一个参数UUID_name，它是UUID的字符串表示。

返回值： 该方法返回从指定字符串创建的实际UUID。

异常： 如果传递了一个无效的UUID_name，该方法会抛出IllegalArgumentException。

下面的程序说明了fromString()方法的工作。

程序1 :

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

输出:

The specified String is: 5fc03087-d265-11e7-b8c6-83e29cd24f4c
The UUID from specified String: 5fc03087-d265-11e7-b8c6-83e29cd24f4c

程序2

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

输出:

The specified String is: 58e0a7d7-eebc-11d8-9669-0800200c9a66
The UUID from specified String: 58e0a7d7-eebc-11d8-9669-0800200c9a66