Java 中的 UUID fromString()方法，带示例

原文:https://www . geesforgeks . org/uuid-from string-in-Java-method-with-examples/

Java 中的 UUID 类的 fromString() 方法用于从相同的标准字符串表示创建 UUID。

语法:

public static UUID fromString(String UUID_name)

参数:该方法取一个参数 UUID_name ，这是 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的 UUID 。

异常:如果通过了无效的 UUID_name ，则该方法抛出 IllegalArgumentException 。

下面的程序说明了 fromString()方法的工作原理:

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);
    }
}

Output:

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);
    }
}

Output:

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

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